Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca47e91c9dc96ba4…

MALICIOUS

PDF

80.1 KB Created: 2021-09-12 23:01:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: cdec02429a47e668ee7e9d27c44d7370 SHA-1: 2214545c763a610bd696790bd7c7d19330b8ddbb SHA-256: ca47e91c9dc96ba4f4deb30426855b74524e7fec6673ee428233928d7e2a3611
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan threat. It contains a link farm with numerous URLs, many hosted on compromised WordPress sites or disposable domains, suggesting an attempt to redirect users to malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern. No scripts were extracted, but the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://eko-inwest.eu/upload/file/6820743961.pdf In PDF document text
    • http://scro.ru/pic/file/91747360404.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/24606195377.pdfIn PDF document text
    • http://www.veslovani-vsb.cz/soubory/file/99738440218.pdfIn PDF document text
    • https://xn--23-6kci4asohe8k.xn--p1ai/userfiles/file/19703576045.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/mabuputovikumagezanadunit.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/ridixag.pdfIn PDF document text
    • https://episcopiaoradiei.ro/files/balopefegozudogoz.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/16899b866da8bff9bb0c3090ded972ff/gowimopifafazadok.pdfIn PDF document text
    • https://sharedsynergy.com/userfiles/file/56855778526.pdfIn PDF document text
    • http://palestraarkadia.it/userfiles/files/kijemubetaridevokusego.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/15tk438ojaevuq3kobn6as4ut7/lowirima.pdfIn PDF document text
    • https://samoinstitute.mn/uploads/assets/file/texizo.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/skqgio1l5003beurp9dr1jr5o8/bimajeso.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/wivamudegoru.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/25117824021.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/3c697e59ccb6fe0dc60ec51066c9a9a8/23088779576.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/38611696918.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132bac75b6bb---44301589818.pdfIn PDF document text
    • http://sakurahoaanhdao.com/webroot/img/files/72816968155.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/fijuzatimigagunujuzuso.pdfIn PDF document text
    • http://plechotice.sk/tmp/file/17175108495.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=chainfire+3d+for+androidPDF 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_off0000d2f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F3 18672 bytes
SHA-256: de004d1b3178c5b15eac56b3e29662b2bda80f20f15a5f93540ea71ae8c8854d
font_01_sfnt_off000103b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B4 10340 bytes
SHA-256: 9f45005593c0dab69fdff294d7023cc09ee854b0acbc20e081bcae37b6a3e7b0
font_02_sfnt_off00011afc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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