Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe5001a09cb6d33e…

MALICIOUS

PDF

69.6 KB Created: 2021-09-27 21:01:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bc57ae7d5b98bf10f6180922342104d9 SHA-1: ed911052ea8f402fe79f06e3525196f986472800 SHA-256: fe5001a09cb6d33e1edec2d643f974df74ad484bf68851e0cf9ddc319e5b5a3a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics indicate it functions as a link farm, directing users to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://classconnbio.com/img-jacson/files/45122733698.pdf In PDF document text
    • http://vicc.huh.hu/UserFiles/File/tivezuzejurovemibutigu.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/66111368861.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/99268685188.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/afda445e8b9756243eb6f56be44f5a00/34654985359.pdfIn PDF document text
    • http://zanethompson.com/userfiles/file/46055804932.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/10795c5e5b5e523e355788723ae8b531/begofitata.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/59104693892.pdfIn PDF document text
    • http://apcmagon.com/userfiles/96604078620.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/betagekewilopov.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/4851726955.pdfIn PDF document text
    • https://majubesar.net/contents/files/16402205959.pdfIn PDF document text
    • https://ku4ysk-9lgp4y.com/contents/files/87825704178.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/kobaniwig.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/rasazugazuzegekeg.pdfIn PDF document text
    • http://fittbikese.hu/files/file/94326602180.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/19640722975.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1614781ccdc8ba---39556133258.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/lumezamemina.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b891821935---272389501.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/107v8onpvlnn99t5a3e5144o92/87489802336.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=calculating+work+functionPDF 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_off0000ac88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c49a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC49A 16788 bytes
SHA-256: fe2fd486c7204dc3233fa5b884f7f0ac7cbd93592a98e38bda62f94de5554e2f
font_02_sfnt_off0000ef59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF59 10520 bytes
SHA-256: f276fac182f2ba586b3b5a8ea290fe7b6360cee3d667e241a690614e58042d83