Malicious PDF — malware analysis report

Static analysis result for SHA-256 09b4151f3be2e975…

MALICIOUS

PDF

69.9 KB Created: 2021-05-03 05:05:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b24633c8526fcacf990b468d08b3845f SHA-1: 1294615c344b1deaac9b89187062d0eec5377386 SHA-256: 09b4151f3be2e975c94c6a41bdd96f9dc0d28199ee069b748e944dcd4fa98224
164 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many hosted on compromised WordPress sites, suggesting a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains text related to 'gridwords factoring' and 'greatest common factor answers', likely a lure to encourage interaction with the embedded links.

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
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://unique.global/wp-content/plugins/super-forms/uploads/php/files/8d254a222d697537b87d145ea9226a2e/peposawuga.pdf In PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/f4eanks4hqf5mg8lquhfn15dru/parowajifupugin.pdfIn PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/kabf3an0n0qba0p2n1i301du0v/kagovowipinapegarabawevar.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/97d7ac5a4b989482470e1336125ab383/gazelutenepogavajugorakij.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/sstovencmb9r0b8qn3vmv635k7/86746291899.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608218c63e010---49155809689.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7f6dcb6d1---razilew.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c039e611c9---dibobazuzobu.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/5f212c536d044b6ff5da5a4c4686cec2/95745034095.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160765fd4b0463---75630913832.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738cada978d---58096852631.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/lulavubexukafoxoleraliki.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084afb51c6ba---finevok.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/9fef40e549ab7da6e2896d9f32198464/32136607075.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/kapidapeziposilekuwer.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/kilozewil.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=gridwords+factoring%2523+1+greatest+common+factor+answersPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CE 5280 bytes
SHA-256: 13a274bff0d4420c336085f7ae1675ff2b4de04d68f09c0082257a39c0c5897a
font_01_sfnt_off0000e7ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7ED 10412 bytes
SHA-256: d4d4d1626a9604ccc9b200402dbc64c0e06f6429ec3ff929d429f98d4c549fdb

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