Malicious PDF — malware analysis report

Static analysis result for SHA-256 645389b4131a47dd…

MALICIOUS

PDF

73.7 KB Created: 2021-07-13 15:37:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: e474c08653b34633a18c0d9a15143f5d SHA-1: 08922ce80694b65c816fafade35a930274ab8cbd SHA-256: 645389b4131a47dddd92bcaa84a1367e8903e1cc1facac81d8635d51a1efccf5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting. The primary purpose appears to be redirecting users to external, potentially malicious content, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be8f9cc956d---20326238048.pdf In PDF document text
    • http://fouladsazanco.com/Upload/file/zijukavejiseduvarowup.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/700457325.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/jupuniragukofiri.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/32f7544b21715900b4f231c6c44f9006/tesoziwudibutufumit.pdfIn PDF document text
    • http://saga.diamonds/uploads/ckfinder/files/56490212621.pdfIn PDF document text
    • http://whs1963.com/clients/7/75/758a827d59fb1c2827eec60421ffdc22/File/jakaxakegixokaxokuxu.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/8c80c019be631f1297dac026d1634a8e/memevadabunogevos.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/pogebiwoxosevuxobusunuvuf.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/34392441395.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///jidasoxekadog.pdfIn PDF document text
    • https://nhanloc.net/userfiles/file/gowuduroluxijurijagoku.pdfIn PDF document text
    • http://stylowa-pss.pl/userfiles/file/37580497542.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083aa58b3925---23105802526.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/96db916453378218b9225769abf4e3b7/50462920866.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a242edf4c---39955868118.pdfIn PDF document text
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/milejezogukanuv.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d9539b284---giresaxe.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/iqachbaf678om2h9l4irrmggin/70711998727.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/8061a14ba335a0479c9f013b591f286e/20525367915.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=computer+organization+and+design+revised+4th+edition+solution+manualPDF 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_off0000bde6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDE6 11172 bytes
SHA-256: f222dc3d1130fcdddcf4dc9213273ec68e775f45eec853c0c78c483d08126b0b
font_01_sfnt_off0000d7be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000efd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD0 16228 bytes
SHA-256: 5b148798c8a93f5e9001bbbb7922eec4e71ee8fcaf6deb2e7466863822e96f74

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