Malicious PDF — malware analysis report

Static analysis result for SHA-256 9877db61e6a2501d…

MALICIOUS

PDF

76.1 KB Created: 2021-06-09 21:45:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7e64ac7c58d9e234bc9f57d64d9910c SHA-1: 1e95d5c5059814ec93e76ac89fe4200974bc9be8 SHA-256: 9877db61e6a2501d5c4e9d14fa01100bb37c8ec66d3946fa30c56bec81d33ebd
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to compromised WordPress sites, likely intended to trick users into downloading a password-protected archive, a common tactic to bypass security gateways. The embedded URLs and the nature of the link farm suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://catamma.ru/uplcv?utm_term=igo+nextgen+latest+version
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099afba930a1---ledusokaxebez.pdf
    • http://aiskreunion.com/clients/b/b4/b417c2091670ce0b0d78f4b231aea02c/File/93356772498.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160b23054e0074---vipefuro.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d8b52a447e---jigiw.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/e1hj19r1q3qdf24j7v7qthdtk3/6055688234.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080690549832---30884746718.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/32286216786.pdf
    • http://niszczeniewaw.pl/userfiles/file/dujaj.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160a00db87f5fa---mekuronojim.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a41eb687989---wapepibusewig.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/8c66f147d0fec8ddc4df3dd946fdf5e0/37081199660.pdf
    • http://unsersohn.ch/images/file/32558678393.pdf
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/f7374a5f3bf6506cc731bc2189c934bc/81761309945.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb56.bin
499437b90eb1631f59c4e4310f68d24c38f888962b2174ddda072dd937158baa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB56 4916 bytes
font_01_sfnt_off0000fc2b.bin
1ec597e463cf4fd8b04704de2811ac610e203941b4b66e78224bd9c050b859a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2B 12136 bytes

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