Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac6bd7985069b30c…

MALICIOUS

PDF

88.0 KB Created: 2021-08-08 16:59:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b46eb77c6c09a308fa12a820d98c7b89 SHA-1: ba4d9b1ebc9dfc187b7be1848f29a5b6169a43a0 SHA-256: ac6bd7985069b30c31c737f3aba8029cd9d333af4886aaa270a7606eeaa3e218
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the nature of the heuristics indicate an attempt to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://esistore.de/userfiles/file/34525363635.pdf In PDF document text
    • https://xn--mgbaf4adbs1bd2i.net/upload/ckfinder/files/wurulifuzozozedagipoto.pdfIn PDF document text
    • http://stinpo.com/ckfinder/userfiles/files/bawoterufegur.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/38318727483.pdfIn PDF document text
    • https://topupdana.com/contents//files/vunowadoxaxasim.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/lidavuwomu.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/6smop7lgg6s24c3fdsu3p1npqs/gedukapevokitiwepijub.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16076bca69623a---japozanajarabavepotaxopib.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606f54bef4107---mikokoto.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2d3a268af---xemekugasiwomafusosuwozo.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/3a9a9f8eb4a696f4002e5a33dcc51992/keguzamupiwebi.pdfIn PDF document text
    • http://landonintergroup.com/ckfinder/userfiles/files/32561652504.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/gufinagikekegomiretofa.pdfIn PDF document text
    • http://limoride.net/gallery/file/misapoturomaje.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/7202969178.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/jafufojijalideputidi.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/77653077958.pdfIn PDF document text
    • http://daonshop.com/files/fckeditor/file/36703945373.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/kr93vj92be9bbjneurut2tkcv7/46238009056.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/6prk20t5v1ai3ajj57emvqcdrm/fukijifejiluzu.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/f24ea650b3ac7475d3a15eacc5d0d53b/18198328249.pdfIn PDF document text
    • http://agriturismolionsfarm.it/userfiles/files/wujimedo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=why+my+apple+wireless+keyboard+is+not+workingPDF 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_off0000f424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF424 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3B 11264 bytes
SHA-256: f0507e479dcc7da90f38c3f1585c352b5c848c13c5ab756e2e3e2fb41c739e11
font_02_sfnt_off0001260f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1260F 16700 bytes
SHA-256: fedb67508b940a46a2faaa771e2a953f01e49bf2911bd0483f9d9c1a392e7dcb

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