Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dd168faf0444399…

MALICIOUS

PDF

92.1 KB Created: 2021-06-28 01:27:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aa8f601d9aedd8b353e8ca29750c0476 SHA-1: e5c73e73f6ead93d175faddd71077937c3336714 SHA-256: 4dd168faf04443992a08ba57ad53345414e10e3c9d53ff88362837f8350dd7d4
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting, likely intended to redirect users to malicious content or phishing pages. The presence of multiple external URIs and link farm heuristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://okeefesreef.com/ckfinder/userfiles/files/12973321298.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/df38a75af628677e7f0637860292145f/konewokedidepug.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4923173d29---48341624205.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3a977d35d---rurupetabuxuro.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16096d85c0abe4---sekivawixinomuv.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/68e5b55d98be0d6894a2fa47aa1f8a9c/rezibemodifebogogiwadaz.pdf
    • http://ahkjt.com/upfile/file/76747155028.pdf
    • http://alibabashipping.com/userfiles/file/fesukilutiwixosaxemuxu.pdf
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5bb432cbc---33015946207.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/787cd7fee680efe5a2c74ce13192029a/tebimekabujiduv.pdf
    • http://arcadia1973reunion.com/clients/3/33/33cb7023d77084166ed027ca16b579b7/File/doribotu.pdf
    • http://charivne.info/images/file/sotiwugokakogunetupezo.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba06132be1---jupuw.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/fcb7412cd9d67fae8a09fdd2b1ef9388/98990699713.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b0987789e4b---56946217608.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/frktoadt8qnh8mv86s93fopk54/lerexoximoxupasuludako.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085aae5341e5---33649904298.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b471f0df38b---539985247.pdf
    • https://ckmusicdesign.nluserfiles/file/wegefopabovejumefuladan.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4eba0e096---87881401172.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=pathogenic+organisms+are+those+that+are+susceptible+to+diseases
    • 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_off000104ef.bin
1f9b9da80b2f4f2e8dc4ace202ae5f4ead38388cfc9d8bfebbde4962b782f7e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x104EF 17172 bytes
font_01_sfnt_off00013170.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13170 16792 bytes
font_02_sfnt_off00014987.bin
f5cb52a631dba7e7f6635d2790c68d981dc9046c9429b1293111c88b65d1dcff
pdf-font-stream PDF embedded font (sfnt) at offset 0x14987 11204 bytes