Malicious PDF — malware analysis report

Static analysis result for SHA-256 75289becfb7c946c…

MALICIOUS

PDF

89.2 KB Created: 2021-09-06 13:48:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 425aa992780fcf5ad15f6bc288b01027 SHA-1: efc5a904eba7666e3498f57b27a9b72ea95e5aa0 SHA-256: 75289becfb7c946cda0cb21abfcfff4b9fb2caaec38bb4341f91aaaf8f09dbc2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a malicious PDF, detected by ClamAV as Pdf.Phishing.Trojan. It contains a link farm pointing to multiple disposable domains and compromised WordPress uploads, likely intended to redirect users to phishing sites. The PDF's structure and embedded URLs suggest it is part of a phishing campaign, potentially using JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://inwebjor.ru/uplcv?utm_term=klipsch+r10b+soundbar+manual
    • http://recrute.fr/files/files/wumewafon.pdf
    • http://thedewakohchang.com/image/upload/File/2685685285.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a0487fa87---62313232257.pdf
    • https://agencement-menuiserie-var.fr/stockages/files/joxunajutefopatufiwewewux.pdf
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/a2c84rvuo6i5767ae63vn7jbbe/59350945882.pdf
    • http://andrelandberg.com/userfiles/file/67016382204.pdf
    • https://seeandhearbetter.ie/img/shop//contents/36020824102.pdf
    • http://master-sign.ru/ckfinder/userfiles/files/rimajugujaxowigurutonijej.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/148c3cb74f6c8fab29080c6179f7eb41/84654801515.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160909cf051cf8---sufifujirasoxuxazisejodo.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff9f2e9306---60600131547.pdf
    • http://upperdublin1970.com/clients/3/3b/3b2fb281f4756d03d37a29c41a8c1d95/File/jagowipokup.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1609aaee4d152a---sapus.pdf
    • http://gayaarchi.com/userfiles/file/20210805061443.pdf
    • https://www.tunnel.de/files/uploaded/file/radiwiwikuvutusaxizalo.pdf
    • http://climacom.eu/userfiles/files/tidubagemolulel.pdf
    • http://escqatar.com/uploads/userfiles/file/file/nekawujigelebozojojati.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/552d36826eb26b7ce433a23164be6557/tugunojapadurazor.pdf
    • https://aawyx.com/sites/default/imageuser/file/kirubawiketus.pdf
    • http://lesen-und-schenken.de/userfiles/files/taxidutariwukebivesitajoz.pdf
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1610c02d1796dc---89908822812.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/b7f96ff89f988fdfc3ad0cbf5b1444b4/xewipefixavexozodusolozi.pdf
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3de8b69f4---72191924189.pdf
    • https://cometsecurity.in/admin/userfiles/file/gipalirawapofapajime.pdf
    • http://pneusmarene.it/images/file/kazexefomejaz.pdf
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/1d61b0cab250e06b4f10190d3f514914/pizugalolowatoxateto.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_off0000f2a6.bin
1506ed4bcfd845bcb8d431232e59901377b8b8ccadac7affe5cb199ade8c61b3
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A6 10952 bytes
font_01_sfnt_off00010b91.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B91 16792 bytes
font_02_sfnt_off000123a3.bin
25115056aca906ee948e7064e7fbff8afa96d53dd4f8f20fdeed07555d3c6eab
pdf-font-stream PDF embedded font (sfnt) at offset 0x123A3 19200 bytes