Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b123768a5a82814…

MALICIOUS

PDF

91.9 KB Created: 2021-07-03 05:33:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 94b5ca0bbb956012441056b42b4de6c5 SHA-1: 6a03d137dfaf288e89c43f2efb93464fdb628611 SHA-256: 9b123768a5a828145a669823508760ead962da5cb142d4c24dd4e42d05818736
256 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File T1553.005 Security Software Tampering

This PDF file was detected as malicious by ClamAV and exhibits social engineering tactics, including instructions to disable security software and execute commands via Win+R. The embedded URLs and heuristics suggest it is part of a link farm hosted on compromised WordPress sites, likely serving as a lure to download a secondary payload. No scripts were extracted, but the overall pattern indicates a phishing or trojan delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7e451f5a1---tuditatevaxogexeze.pdf In PDF document text
    • http://cdmatik.com/uploads/file/katepufobol.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/cj4l9u5ol4gr4pdljlqh7upr87/zirufavawukovolopules.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b757111e74d---76776584407.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/32812099131.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160993f32d3579---48374610274.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/8vivopq80ovfduu1v8pj3q76hn/573654208.pdfIn PDF document text
    • http://monroe74.com/clients/871877/File/33890679257.pdfIn PDF document text
    • http://blessedfamilycovenant.org/clients/c/cb/cb727bc273eb4203dc66fb73741ae5ae/File/22569920558.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/b48947ea3cabbe76c8c1a5d9c9e1e80c/kabepaxupanukanimosezu.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1608af5e2b99ed---53077095025.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/b7c4d8e0a1f4228b96e6fb724aa003e3/xelemori.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/98011545926.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/qiomf8fmtjpatpf1pknvsft5k3/62109701386.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7245699bc---fanaronapazefidilupoxog.pdfIn PDF document text
    • http://7onseventh.org/clients/868256/File/91336346345.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/m8ml7d36inp9cnd8v6gumcgrsk/zakuwotosubasor.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160d8f881bbffe---jejolagimuzajofiw.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/58817773449.pdfPDF link annotation
    • http://bearings-home.com/userfiles/file/lavakegikune.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/janesilev.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/cpg7m7535vl714kf829dtkk5jl/13264936609.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/c2ae7d95cb7e98170db0e0b06bf4c27f/puxodolagofagur.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/lidalo.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4b68f26e0---44150829171.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/gafemakoto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+fix+driver+irql+not+less+or+equalPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF859 10836 bytes
SHA-256: cdf05c4c9f6bece00ca8e099638fee4cae67c9240af58316ce4940056316eb29
font_01_sfnt_off00011147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11147 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12959 27936 bytes
SHA-256: 55c4d3ed1fd62cc7a0f881470310c68fd0d071f98cbe62fc44e5751d7de744ce

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