Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a764c97bf8d6903…

MALICIOUS

PDF

78.9 KB Created: 2021-07-06 02:25:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8f0d7355a886bf32379113f7fbae2f71 SHA-1: ea1dc800d06068ab545cc00bd13fe7c6a07456d2 SHA-256: 4a764c97bf8d69032295fa9cd11ce92cc7659cbcdd9285222e93adef7c9e8a40
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised WordPress sites, suggesting it's designed to redirect users to malicious or phishing content. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or redirection attack vector, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a497824b15a---takuwemuwiximitugi.pdf In PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c44db214d---9042531333.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/907c22a7d2510e81602018c5b91aebd3/659186197.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2f295626d---96743255240.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/97280926211.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/76330722262.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/visivubim.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160892af292699---fewixidipajivaxufim.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/fadezunurezer.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076220f831fd---woviraxinomel.pdfIn PDF document text
    • https://tidaksusah.com/contents//files/mepapuvuwemabiriviru.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/63346c7400c9e6d22f8148048ad032d0/wudive.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c77b6d2d99f---45421642.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/86317702786.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa623b0201f---zufopuzasijawadurenedixe.pdfIn PDF document text
    • http://merwepizza.com/upload/file/poxewiwadim.pdfIn PDF document text
    • https://nilsahost.com/calisma2/files/uploads/gulisijis.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/ed7a4f2068211698360b831ece82d792/9843104194.pdfIn PDF document text
    • https://bharatbiodiesel.com/userfiles/file/96057216258.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/409a48f7d86b02b3f9a4e5376662fab9/22157103040.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac367a1bfc1---22151373950.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b5cefda1b20---wefivutisosegobolo.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/eae10351ceeabbba878b3e9caa5cfd7a/1726099743.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=anthony%27s+coal+fired+pizza+dale+mabryPDF 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_off0000cc7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC7E 17456 bytes
SHA-256: aca54bd39a76f31e915cf4e12711c6d9fe63fe8a4e81b3c2271753abd33cac8f
font_01_sfnt_off0000fa62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11279 11216 bytes
SHA-256: 044ea22f827c3e01f63f19c004d6cc5b26c8a5585cbd84c004ecc730f1040f97