Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dff0085f2b22c65…

MALICIOUS

PDF

82.8 KB Created: 2021-08-10 04:53:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 12194da8f0427572003f54456da328e7 SHA-1: 09a6b31ce059c8c451cc6e4c4163646a673f2d27 SHA-256: 4dff0085f2b22c659271912252ef9b8b850cbdbd96880dab31f1d31bc3a979dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous PDFs hosted on compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the link farm and the PDF structure suggest it may be used to host or redirect to malicious content, potentially leveraging embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160824a0e8d865---lusajisumuxowaboxevavuzaz.pdf In PDF document text
    • http://beiwendq.com/userfiles/file/95017995967.pdfIn PDF document text
    • https://www.milestonesmn.org/ckfinder/userfiles/files/femilidinino.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd36d4c8aa---92285961986.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/a5f366b428785d0122c75db1ff3525d0/98402997830.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/6327a62079510220947c69e20d549cf7/896838037.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/cffc5uu07e79cb76uqofmta0f6/32289287978.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/paxedorutawuf.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f0c3741d268---84917211479.pdfIn PDF document text
    • http://didopack.com/files/81071334329.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16272907926141.pdfIn PDF document text
    • http://aimic.com/userfiles/file/39919460224.pdfIn PDF document text
    • http://heureka-cz.eu/files/tolilomapopawulakidavepa.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/62653303295.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/8b8dc0f424a95e674329e1ccca8fb3cc/2765550274.pdfIn PDF document text
    • https://jagominum.com/contents//files/26156192002.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba524c722a---6155108521.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/zenuzidobovek.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b96e6e65d64---mugojizuxoxalusefonelutam.pdfIn PDF document text
    • http://gt-outillages.fr/ressource/site-image/files/68360891691.pdfIn PDF document text
    • http://ithaca1962.com/clients/41687/File/lutukaxovur.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610eb9e56e360---fenujizewomewuwizem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=libro+de+anatomia+y+fisiologia+humana+mc+graw+hillPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c7bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7BB 11320 bytes
SHA-256: 89a7cb9a9c2b8034c99eba9efcd6d6fee2696f9ecd7716715572cde449fdcb9a
font_01_sfnt_off0000e206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE206 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
font_02_sfnt_off0000f782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF782 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00010f94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F94 17008 bytes
SHA-256: 14fcc459bfb984bba2cbbc3cb84099a90458f01fa3acbf75cfc4978950002320

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