Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb71c93d61f0dd3b…

MALICIOUS

PDF

78.7 KB Created: 2021-09-02 16:45:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 740ae73646439871a2e148c50b4156e2 SHA-1: 49d17b41778b340d7efaa07206350d0138b67193 SHA-256: fb71c93d61f0dd3b3541e08ef8656ccb270a2a519ed451b2fe64c182a0cfd641
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://cructi.ru/uplcv?utm_term=7+nation+army+piano+sheet+music+pdf PDF link annotation
    • http://thepokewave.com/uploads/files/84849197477.pdfIn PDF document text
    • http://carszana.com/image/upload/File/41641441736.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/he19k6fpv4egfog34dt9gc54sk/lafaguvilebigokujopig.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c28d2779e06---kedewixosotatew.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c459f23adea---81347477035.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/7389ad098f4511aeabd86fe9767a8211/dewisul.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/fomebele.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8e708b641---55984562818.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8eebd57007---pipalowopapetubu.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/79228727264.pdfIn PDF document text
    • https://activepymes.com/pub/file/wometaroluro.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/172g5sgulggc98om840lq96sp3/49419440594.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/77517148704.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/wirutaxokomazikosiwukozib.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cfe49f3d9e2---fimuvifepinimozi.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/vobutizufiwukujosax.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608576f05e1d0---feregitamugelusujakipalej.pdfIn PDF document text
    • http://www.dismaplant.com/ckfinder/userfiles/files/38080486179.pdfIn PDF document text
    • https://mytopics.it/uploads/file/dabupawupixibomifakal.pdfIn PDF document text
    • https://indiansabroad.uk/userfiles/file/46997453545.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/d5ud9b143a9341bnltdq7eitkb/88213356564.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210709133139.pdfIn PDF document text
    • http://thietbixanh.net/uploads/files/38135832211.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/53448279541.pdfIn PDF document text
    • 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_off0000d0af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0AF 16688 bytes
SHA-256: d5a50f1b089cec9f2a88bc412bfb4749654ec4c9df8dca5677e99492ce797cff
font_01_sfnt_off0000fb57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001136e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1136E 11004 bytes
SHA-256: ab16bbb128d035a7f76b040365340fd5be832e695550441bbe89fbc2cce7e9bc

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