Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f20bb13c4031674…

MALICIOUS

PDF

85.8 KB Created: 2021-09-20 12:12:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b9d3f6bef82154585ffb5024d55bf9a3 SHA-1: 96843050a3c2eb62739f058af25d7b367cd132f0 SHA-256: 8f20bb13c4031674a26428ab22a54706a70deed311fa0851dc0cc95c7a50ccd0
164 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various external websites, some of which are hosted on compromised WordPress installations. The presence of multiple links and the use of compromised CMS uploads suggest an attempt to distribute malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://jtour.vn/userfiles/file/rosoxubokegazojiwamojemit.pdf In PDF document text
    • http://guchen.ru/d/files/kewuwivedug.pdfIn PDF document text
    • http://rld-carbon.com/file/gaxuvakumavobarikeses.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/fh8spkdj13gctqejusmh7ts6gn/rexilekerugewe.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/43573532273.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/pifonoxok.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/2db0dc9abe6b6493695187e2ef0475ff/vetowenetavupimaxogunu.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/3e6a09aa9d5dfef06380d978410b3f19/mobulobupumuvulu.pdfIn PDF document text
    • https://tgvl.in/uploads/fck/files/tipatujebo.pdfIn PDF document text
    • http://antitumor.org/filespath/files/20210903184641.pdfIn PDF document text
    • https://csmgh.net/pevron/www/img/file/tomigil.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147c94636d2c---19996134153.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/bofugagawuvo.pdfIn PDF document text
    • http://innotack.com/userfiles/file/bomawuvuwezazegifumudo.pdfIn PDF document text
    • http://zamgph.com/FCKeditor/editor/filemanager/connectors/php/uploads/file/130609187967.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/nasare.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/7dd1431898a911d8029313a457632c32/6922925198.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/ff5730da2bd398c1f2f2b6a6f109a8bd/77554227223.pdfIn PDF document text
    • http://etnorom.hu/pictures/94551947593.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/nupalororese.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/2233047199.pdfIn PDF document text
    • https://mangallagn.com/images/file/najutukesivederalesemibez.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/q14hr6qqq4gq83r6vh4q3jv0ag/futujulebed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=barbie+dream+house+unlock+vipPDF 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_off0000e4c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C4 19424 bytes
SHA-256: a0bdf8f0d3ad958e1601af164dfdd6742994b7f54d0bc2487c2d77bee60f23ba
font_01_sfnt_off000117a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012fbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FBD 11132 bytes
SHA-256: 476950e0a57a5891bab67dbaa852b41965e12e43bd9d8e07c058662495812575

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