Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc13da7ee4084280…

MALICIOUS

PDF

98.6 KB Created: 2021-09-04 10:21:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bc4c020ec3ff5dc48656508cc756a23f SHA-1: 6bb52c1ff640b861e051489977a59145bd4fe4c8 SHA-256: bc13da7ee4084280baa832c1b8e151a1a0df098f981380a52efd66717466e3eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document's structure as a link farm is a common tactic for distributing malicious payloads or leading users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609abc352c0a6---35557222738.pdf In PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/sm6vs9roidl4kpvpkrnogsfap9/pubes.pdfIn PDF document text
    • https://krono-original.vn/Images_upload/files/26781678843.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c38a0be8389---75534814879.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607feeac77327---22506944125.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7fc1b5f77---ripeseguso.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/zolelizumonop.pdfIn PDF document text
    • http://htwy.com/upload/file/pezesekadowazot.pdfIn PDF document text
    • http://tnetimes.kr/upload/file///sosizovabajuvunipewol.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/guu0uoclvv8kng5095jnmkbj61/86277857384.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/kipijujurakajanubifepofoz.pdfIn PDF document text
    • http://sieuthibds.net/images/files/rusomodixolu.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021090312545473499.pdfIn PDF document text
    • https://securitydm.eu/slicice/file/74920875027.pdfIn PDF document text
    • http://altus.pl/userfiles/file/litegi.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/jizomu.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/eblqmlub41ggeuobudhh23uoh1/mudasog.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/3k43lilmo7s9k360f131gt0gj2/14128666399.pdfIn PDF document text
    • http://mobilahomedesign.com/userfiles/files/majezikuv.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/ba2119ee704592d35d03e694e2b0fe0f/65204842029.pdfIn PDF document text
    • http://boletin.alicantehosteleria.com/lib/ckfinder/userfiles/files/vapuxabopinekutam.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608df81031dcb---sejuzemavetaj.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e130c40d7---midoluzodefudumuzowilegi.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/birojegifatudagen.pdfIn PDF document text
    • http://www.motorradfreunde-toggenburg.ch/up/files/76217338905.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=history+of+tarot+cards+pdfPDF 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_off0001194d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1194D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13164 10436 bytes
SHA-256: 6d7cb80261c0e26b0ec24415f5901d26b4489171fa9e9b25f7ceec3ce872107e
font_02_sfnt_off00014935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14935 19648 bytes
SHA-256: b94d35f8b3bde0b7b4d64e0642f9e00a7033f7e3bdce694ad11ad0d32e033d2b

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