Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c68f46d402275fa…

MALICIOUS

PDF

72.7 KB Created: 2021-09-29 02:27:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7a326ab1de3e157b2a5b628ef779df37 SHA-1: 594e1b46ad2c5cc6609a18b7d1d106f1590c4746 SHA-256: 1c68f46d402275fab62871f2018b115b33e239225d7a6c447c1a89564afa4c0d
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ML classifier and ClamAV, flagging it as a phishing trojan. Static analysis revealed it functions as a link farm, with numerous embedded URLs pointing to various websites. Some of these URLs are hosted on compromised CMS platforms, indicating a potential distribution or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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 https://nomylo.ru/uplcv?utm_term=fxguru+unlock+code+for+android+txt
    • https://babetravelling.com/ckfinder/userfiles2/files/75783055796.pdf
    • http://inwallendorf.de/userfiles/file/56734964607.pdf
    • https://almuhja.net/ckfinder/userfiles/files/lerijabaretigefodapezoz.pdf
    • http://klubbelgickychobrov.sk/editor_uploads/files/rewotigeda.pdf
    • http://www.smwiarus.pl/ckfinder/userfiles/files/41645558421.pdf
    • http://n2nnetworks.com/files/others/89413655640.pdf
    • http://cpviettin.com/upload/files/kosij.pdf
    • https://alshaabcoop.com/userfiles/file/kofixoforaxudiruja.pdf
    • http://niengrangchuyensau.com/upload/contentFile/file/wopawukabasidojik.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16148b51338a9d---sinapunituka.pdf
    • http://taborgospelassembly.com/userfiles/file/gikavi.pdf
    • http://htbestcomputer.com/media/ftp/file/wudawarafulipejevi.pdf
    • http://dilimkebab.com/userfiles/file/wuvebiv.pdf
    • https://retake.dk/ckfinder/userfiles/files/defazepod.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16141729335533---kidinolelikuvibadum.pdf
    • http://generoussecurity.com/uploads/sevebipupiwa.pdf
    • http://nm-union.ru/ckfinder/userfiles/files/12714973009.pdf
    • https://nabijdefossa.nl/upload/files/tuzarejulazuj.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/vt2nrcb6a7vlon0fl2pqu2gv42/diloge.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16136423851aed---51646182558.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614886fabea76---xuvurim.pdf
    • http://liily.jp/upload/file/20210925172824.pdf
    • http://vansuloi.com/uploads/userfiles/file/49123763540.pdf
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/94e8fb6382a2692bfc0f40189b19aa75/69240751951.pdf
    • https://kanat.com/upload/ckfinder/files/junazejezi.pdf
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/aln549f22anfl0bg9ikvebu5sr/wedonelugal.pdf
    • https://kujainspectors.com/candyticket/uploads/page_images/files/73517639499.pdf
    • 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_off0000b4d2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB4D2 16792 bytes
font_01_sfnt_off0000cce9.bin
a3b7a30b1a7f93feb7aebd8efe04887e6a93578d8a0573ffe545685533c73518
pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE9 10756 bytes
font_02_sfnt_off0000e58c.bin
7d5f1e9880b3699172dbfd3ef8ba3efea4a765b7f26f5a8bd705cb1c494809db
pdf-font-stream PDF embedded font (sfnt) at offset 0xE58C 18332 bytes