Malicious PDF — malware analysis report

Static analysis result for SHA-256 c989bf010ad5c5e3…

MALICIOUS

PDF

76.7 KB Created: 2021-06-11 04:28:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a8f62faaa99941651de8eec0f493b529 SHA-1: 830b8d9d2adfbab82ed765329d5de1bf9d77607a SHA-256: c989bf010ad5c5e3a57d6041f18e1f87a00a59556eb3ad49f13b6d932a15a771
156 Risk Score

Malware Insights

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

The PDF document contains multiple links, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the presence of numerous external URLs and the document's theme of 'recovering lost contacts' point towards a social engineering tactic to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://crewmak.ru/uplcv?utm_term=how+to+recover+lost+contacts+after+factory+reset PDF link annotation
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/a223a78ca05cc22a8ba3fa9a7dd93709/zitavabaratamevewisana.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0fc57d6db2d8b4f4d3f4730870db7d81/zomitom.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/r99fgeq0adfejd7cip5u2str1k/jevogugakamul.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/4427cdf5d21bbe1bff148af888ec9093/98932462518.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/d4ab58b0185a87e7ae17c5ab2b4e3fae/63738300049.pdfIn PDF document text
    • https://munord.com/wp-content/plugins/super-forms/uploads/php/files/989cc9ea89b2ef1b1881c57aa1934d66/51393010599.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609870ee9f704---menifox.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb97ca5384---mazud.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/32247206609.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608729c633cda---muxiwurolemaran.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/pureseripuna.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bedc18ac052---52226483799.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/60840246605.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e3e9896a8---tozepeduwenosaminet.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1e04cf5c8---14996569262.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/dexoruj.pdfIn PDF document text
    • https://menu2uplus.com/images/file/vexepezorijarop.pdfIn PDF document text
    • http://wenxuezj.com/images/File/470190579.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_off0000edf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF2 5088 bytes
SHA-256: ad84c3e08271d5f3f5e504345b5ed3531b1f5537eddf9c2e7a6430d42d19147a
font_01_sfnt_off0000ff6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6C 11236 bytes
SHA-256: baf1d9af89dddf0a3c17ae415922b5758be1caae591c202364fad73cced0d04d