Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae51c9ebec16be6c…

MALICIOUS

PDF

71.3 KB Created: 2021-06-05 20:16:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: a9667cd4c907116943b3c4a4816fb8f5 SHA-1: 0c81aa219bbf39ace6f703f42a5f87ed0bdd8caf SHA-256: ae51c9ebec16be6cd920c037f86daa0cbfcc896177cb9aca6aa245035d85f132
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document, detected as malicious by ClamAV and an ML classifier, functions as a link farm. It contains numerous URLs pointing to compromised websites and disposable hosting, likely intended to redirect users to phishing or scam pages. The document body, though heavily obfuscated, suggests a lure related to educational content, which is a common tactic for phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://synerhu.ru/uplcv?utm_term=24+consonant+sounds+in+english+with+10+examples PDF link annotation
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e408bcc67---saxamid.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/325a639660fca359e5ac8d2eec7046af/luleguvilamivezugoxaf.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/12987403039.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/5708c4e9337eb5d92443cf7e22fcd101/xezuv.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608292517b08b---zulatatajetujamuji.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/26326525091.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a34e1289991---86574454286.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/9f86c8a032328d8dbfe614ddef5763ff/vagixiridadobevemug.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/gubag.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/67655441f55eebfb41cb52823574ee29/wujojutewa.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/t5j9spkhjhue8ebsmfasajkvr5/83831611073.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8186ad0cb---fupalupekejulejifalunak.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e4a4bf27a---90582737207.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/5832867812.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d53b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD53B 5872 bytes
SHA-256: c349f3b7b536659980370dd94750c525edc8b75e6d18faf96c21e27a8ef296b5
font_01_sfnt_off0000e934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE934 11744 bytes
SHA-256: b4f16cfd60cb022ac95d2fdf29797acc8349814e6dabbcb3720cc5f8fae728a5

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