Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf905608c25f657c…

MALICIOUS

PDF

103.6 KB Created: 2021-07-23 05:30:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 97b7bde6ca452470cf81e4ae9bf8cc0a SHA-1: 85f25f1b516d479df24e93ac15e8b5f1b08f760c SHA-256: bf905608c25f657ca329cd8d639965098a09559b28136d3bcf46597ba0847a36
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/1a5353793a5aad7cad2b1b1d4f802d17/tizifabofebozagavo.pdf In PDF document text
    • http://dermaktif.com/imgup/file/keminasuxabedaw.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/69948230362.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/deguramarizutalemalu.pdfIn PDF document text
    • http://fedime.org/imagenes/18384236458.pdfIn PDF document text
    • https://fundreamz.com/ckfinder/userfiles/files/95868684418.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/11603923336.pdfIn PDF document text
    • http://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/49p2pfa4d7bhmmf0m49tlk5lfm/losozekasarupameduxu.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/61841118723.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/22248529053.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/zoronexaj.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/654dca123043ee79d579d33e9e3729c3/tikofoputopop.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a2184e4487c---32162974081.pdfIn PDF document text
    • http://zerosquareonline.com/file/30899374022.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbfc40eb57---79277657655.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/utlten0d09up71cnqtg42bn7d1/lumimi.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/c1f64d0f8a99e76a95dffa7cd08880bb/70448693234.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/a3tbfk7kcsu9bdm554g9hc8bdc/wipoponadidubaxeparofowi.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/15092934576.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/fidibepixibikupoxagi.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f6928377c---38337171749.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160740bfd08739---dutul.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160832e7cc0e3f---63217730212.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=songwriters+music+groupPDF 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://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_off00013194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13194 10772 bytes
SHA-256: 3a537f1fb27b90d3b4c67c61a4b2ea0ce870d10084ba49830344b69d6702685d
font_01_sfnt_off00014a75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16287 17544 bytes
SHA-256: 77b0d26940c2d0f2df82e86694cbf1dcec6441f4c6e1d5e9dc9a2c2023dfb473

Open this report in the interactive analyzer, or submit your own file for analysis.