Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0802200849b9b42…

MALICIOUS

PDF

85.8 KB Created: 2021-06-26 09:41:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8dfefc047de40bcfe23132583f9b00a6 SHA-1: 2ba094dad03fac1f9cdab6d354f056f96d25f0fc SHA-256: c0802200849b9b42240fabe22c3f6f00ce6ab46c85c32cb9642036d4b1f3ebe0
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites 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 for phishing or malware distribution. The use of wkhtmltopdf suggests the PDF was generated programmatically, possibly to obscure its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://babamoleskine.com/files/file/vitorixiw.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1942b016b---30030070245.pdf
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/5lb0qt7q0n7i380gvq9rjhvuib/41058724395.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/983141e0662ff90712e9ffa7b5bf7630/vapijonadojarakufumabe.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609499fad225d---31440840586.pdf
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/54012f380c0e29e5d14c9fa798ea5bf2/13646563258.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c241a10132c---romejuwaxuvafebadulenuv.pdf
    • http://airsoft1.ro/files/file/poporibezeg.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a44a8dc04d9---48820273971.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b77453d1ceb---97010154341.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/bv8uk9l79a1jok16f65t8a8b94/48171627713.pdf
    • http://eventologia.com/userfiles/files/dezonawupoluj.pdf
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/ihl0pnc4btmo4iu88aon82qa3g/fibofavabe.pdf
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/a8a6986bb6b96f7fc440da51b392076e/ximazigigeki.pdf
    • http://www.ecvbrass.ch/user/web/file/41395440321.pdf
    • http://fapannimario.it/userfiles/files/58736763336.pdf
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16090e1658115c---31854051724.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/0036653be340859cdda77c4e225a7a01/lugivabaxuxi.pdf
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/sdsbla57fb40fdbbhbm6l95if0/89299866913.pdf
    • http://aryajob.com/user_upload/file/10677702947.pdf
    • https://sjalikave.hu/pictures/file/59026664375.pdf
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7e926db6f---29756258632.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/ceh20m982cjquaef8nn78kdrg6/7207645933.pdf
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c5041143b45---xisixuwe.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=thoughtful+sc+stephens+read+online
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec18.bin
52f3d93b92cbac4af189a5528595e04e73086d32423aca30305ae83a08bdfaa3
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC18 17060 bytes
font_01_sfnt_off000118a0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x118A0 16792 bytes
font_02_sfnt_off000130b7.bin
cccccded5cf7c71c391b68dde0ad969f7f98e0e73392385ca75f332571dd28fb
pdf-font-stream PDF embedded font (sfnt) at offset 0x130B7 10960 bytes