Malicious PDF — malware analysis report

Static analysis result for SHA-256 29254ba5a8ab7b09…

MALICIOUS

PDF

82.7 KB Created: 2021-09-01 13:56:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c68478f8f9c29b22452d821b5fd0a8ff SHA-1: 30e01f9575aa170d91d6ab89f03b693546e6a1c9 SHA-256: 29254ba5a8ab7b097df265c8e60f57a5112abe9349c76eeff41a10622508978d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards it being used to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://crysiq.ru/uplcv?utm_term=past+perfect+tense+explanation PDF link annotation
    • http://sieuthikhoacaocap.vn/upload/files/dofisoxu.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/b0843df0df3163eeea468b04d7b0515c/60011375711.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c9b715131---81720197543.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/25f39f87e8a86bb099e9ab6296a2c8fe/tiroxibirevevez.pdfIn PDF document text
    • http://launensia.cz/ckfinder/userfiles/files/rujuta.pdfIn PDF document text
    • https://ferropula.hr/files/66380274278.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078909f80429---mifafasi.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608971c6edd01---60924918174.pdfIn PDF document text
    • http://fine-trading-knotwork.com/uploads/media/34344739623.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/5ab65037fa274ed4f7fd16e32fd36d92/25040311750.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/sigoberixusolililolelab.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/wemokixebedi.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/d60acb56e4122873caf8eadbd25ae4e5/10863597102.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/dikif.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bd26868adf8---88836515040.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/87417916092.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/fimajetozowavuj.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c1ba37f6c---78602933334.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/f00a53011dab390cf6b1977f39dee21b/90826045949.pdfIn PDF document text
    • https://247hvac.ca/fabulous1/uploads/files/leverudug.pdfIn PDF document text
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/86752235433.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/fuzigiwimafateluni.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/91589447826.pdfIn PDF document text
    • http://davcpundri.com/css/file/tevazi.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/jorujixepizop.pdfIn 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://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_off0000dd77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD77 17924 bytes
SHA-256: b0c7fc5ce86f6f5189009da6de43ef0650c5156f442a64d3cce0fa1cb1e7be2c
font_01_sfnt_off00010c4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12464 10576 bytes
SHA-256: c2f3ef464b97c850916583263247415349bdc4ffebeb1fdda198556e672e7a11

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