Malicious PDF — malware analysis report

Static analysis result for SHA-256 9aa8fda2279269a2…

MALICIOUS

PDF

87.0 KB Created: 2021-09-11 22:11:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7530de8710a6b565e954d7d89c422011 SHA-1: 0e7dd1b20bfa4025ea06c1de0585321f1b41cd75 SHA-256: 9aa8fda2279269a2aac3c586150fa633cbd37566a0ad962aaabbf1a7e73dda09
196 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS uploads and disposable hosting, indicative of a link farm designed to redirect users. The 'SE_PAYMENT_REDIRECT_LURE' heuristic strongly suggests the intent is to trick users into believing there are changes to payment instructions, a common tactic in business email compromise. ClamAV also detected this file as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://kaushalacademy.org/ckfinder/userfiles/files/tesuwazokudelur.pdf In PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/73367121087.pdfIn PDF document text
    • https://nuttydog.hu/ckfinder/userfiles/files/11807446086.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/69654531259.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/18142584460.pdfIn PDF document text
    • http://agavietnam.com/img/files/41864004371.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/163055627951.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/4ec9399d1b244f0e58463604c4910ca6/butixanajevupemofop.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/74741062627.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/16513274289.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/93246040722.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/zesawodazofizepirep.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/riselilapow.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/7048609774.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/458fd0514380f324bf4f57f7cfd5a884/tujudowuvipinoki.pdfIn PDF document text
    • http://somersetcountybar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/26822807980.pdfIn PDF document text
    • https://lazerom.pro/media/file/galewubokujajuxa.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/21772951407.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/18029832284.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/74dfeb745e8f3eda0a4c619cacba75a9/31347564451.pdfIn PDF document text
    • http://goodlife88.com/uploads/files/dipakebowerodonijojafodiv.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///13024107685.pdfIn PDF document text
    • http://tangneylaw.com/admin/images/file/kupomawiduropuvofilebuw.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/60847976783.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9b53b19b3---sugajiganitofipuguninewo.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/59446225741.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+to+see+private+account+followingPDF 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_off0000ed7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7B 18004 bytes
SHA-256: a182c27612efa1d13c8b5468a6ad8abb2d3b1859d832b5c256b3eae856d88dc1
font_01_sfnt_off00011c50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13467 10896 bytes
SHA-256: 9bd59987f9c0d78673b8770e7e88962b32c673ab04feb72139bf1fbf709c6adb

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