Malicious PDF — malware analysis report

Static analysis result for SHA-256 64821ebbef8179d1…

MALICIOUS

PDF

86.3 KB Created: 2021-09-02 15:09:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 98f7e30ad79c5dd62aa5ff286eae5154 SHA-1: 2dd84063b16c73f2294af968ee522e8de378b2ca SHA-256: 64821ebbef8179d188c15670edd2ced5276c01be037a3af0cab7f1ff05645848
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to websites hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://accronline.com/userfiles/file/pilixajemimudezedamamo.pdf In PDF document text
    • http://olympiad-bigben.ru/ckfinder/userfiles/files/mositemikizagipivora.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/e5e4d35edd46ec77f4aa215ad9c6da3b/seneluweromajusel.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/94500998711.pdfIn PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/68065108923.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210725074454.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/a3d59b3249488c4f7aaeb58af9d4de83/javilesekujixup.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160854ef67ca50---pibulubifope.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/20594294483.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e8db52a3f1---64872570828.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608986c481953---3148667810.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/7he1r8u4u88e4r5fk4btlfr866/99752654761.pdfIn PDF document text
    • http://somersetcountybar.org/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/60576775753.pdfIn PDF document text
    • http://epodhajska.eu/UserFiles/File/93830243996.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/73d404e40d17eed76b5ac929e7b6f94e/jafemevimerefodemi.pdfIn PDF document text
    • http://chieucoingason.vn/files/93596174848.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5378c868c---kefakupekabejofepevijo.pdfIn PDF document text
    • https://smartmedia.ro/app/webroot/files/userfiles/files/68050554230.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/tofabumedos.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/a57b9378209691b184610b320edd6cce/17319483129.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/podidof.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c1fe86acf---83755548064.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/dozonibusobixe.pdfIn PDF document text
    • http://aimic.com/userfiles/file/95892002233.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=chemistry+worksheets+for+grade+10+igcsePDF 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_off0000e7f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F2 11268 bytes
SHA-256: 1cb70de624b3a028dd72b6903ee2d12ea0de5ab096f37f2666ae3549c8ae91de
font_01_sfnt_off00010266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10266 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A78 18612 bytes
SHA-256: 9d34f61f77136f07a6d62a3a54134cdef3dc8e4847dbd0f569ae19d1e03ea517

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