Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcd72fa7322e1420…

MALICIOUS

PDF

73.3 KB Created: 2021-08-27 23:11:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e049fc4b2b7f83bd1b302b62d5ea1cf1 SHA-1: a9412e46a9ff575a1ff90a39b4ed8e27bbdf7fca SHA-256: bcd72fa7322e14205a1505f1a00aa166783fa52b97cc418700c421d8682c62a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The presence of these links strongly suggests an intent to lure users to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://vestol.bg/files/file/xuxetivaguba.pdf In PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609690328b9c8---93675994176.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/f3e68f7ea264e56c059c8a2af03fbbb8/89733894898.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/93227791534.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/biwokirixekuzek.pdfIn PDF document text
    • https://avenue102.com/uploads/file/32270322868.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097b2e15f8d7---vudamojopuderafokapox.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8dee46e77---xodewud.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/tusilawogutijesoka.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/luxigifazu.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c75f53c313---xozosutitexudegimujopeji.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/75540395909.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/34119920859.pdfIn PDF document text
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/84180784918.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611414f5c6959---mezaveten.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a38de7ca603---98285113566.pdfIn PDF document text
    • http://atek-ent.com/upload/file/9149597415.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/52337188866.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/p4sdtal0560ga8eqm5mgi8ivc2/ruzugiwexe.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160734b056d5c9---rinasugodofolo.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/7410475514.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/xekuv.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dec1cef48b---85210654228.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/satekepomujuvun.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/13571406390.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=hospice+of+the+south+plainsPDF 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_off0000bcef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCEF 10568 bytes
SHA-256: e2934181c06cedf423af13e3faf41fdfc1986df154a232cfde4b7c01211e88ea
font_01_sfnt_off0000d4f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F6 16668 bytes
SHA-256: 9ad357bbbfef236eddf59c2a3d19f9786f7d60e831de65ea66ac7bc1e2d4a3a5
font_02_sfnt_off0000ff9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1