Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d4e31cc25c6a20a…

MALICIOUS

PDF

87.1 KB Created: 2021-09-01 07:02:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 36faa6e800c8a3fb4566b7123206ef5d SHA-1: 0850f7e6bc4a345826888dd52a90f611f47c2ac3 SHA-256: 0d4e31cc25c6a20a1e98dd51d7a6841acab4f1d6b90524d4f375f6755f811e6c
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised websites, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or phishing pages. No scripts were extracted, and the document body was unreadable, but the heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://nanobubblevietnam.com/uploads/userfiles/file/boveniveraf.pdf In PDF document text
    • https://all-stage-meditation.tw/uploads/files/60c7879867bca.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/mq644k6dadul2q18nrga11mn83/sopuvewurebex.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/xawujomupajo.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5bf263a3a---43808860789.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/11861942897.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4a988bab8---62971986207.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160967d38ab9c1---76857251334.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/49641611724.pdfIn PDF document text
    • http://vipdiler.ru/files/file/25879622417.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/wigozewefiwesawizox.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/76812565918.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/5419191864.pdfIn PDF document text
    • https://bajrahrs.com/userfiles/file/sibadabotolopujawegawito.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16128999339224---lozusotusudapemof.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/tavagok.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/ravulezizidubofitusojuto.pdfIn PDF document text
    • http://agendaalzheimer.org/files/galeria/files/16549831715.pdfIn PDF document text
    • https://demetraproject.eu/ckfinder/userfiles/files/26215697128.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/e9516b1f10d6fd5f1caff8881f1685d4/rotejigufatirexuxilebafo.pdfIn PDF document text
    • https://hurtowniaroza.pl/upload/files/pegazekulemuse.pdfIn PDF document text
    • https://steammining.com/userfiles/file/20266346946.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/ovphn1cr4kchvk3nobrrr94381/57863549517.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=theory+of+evolution+byPDF 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_off0000f2bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BB 10364 bytes
SHA-256: ca1d139b3593d1ab07cd0b8ac73cbcebcab7687855b676c915f3cc8c1139c91a
font_01_sfnt_off00010a12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A12 17120 bytes
SHA-256: 4738f5ebb44fe727fb0ca83d8489ba55dbf769d6f3f0d849c131f284be982a7b
font_02_sfnt_off00013631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13631 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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