Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8e6f098939ebace…

MALICIOUS

PDF

103.2 KB Created: 2021-07-19 06:21:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 84c0df1cfce96fd91c0be5a0a95fe8e1 SHA-1: 1105f5264944347c7c6916c7f806214e92135d1b SHA-256: f8e6f098939ebace160362cf685369b3e2a239be06ed9da3af551b6e30391351
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics indicate a likely spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cd01ae2c4f2---gukaminugepo.pdf In PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/35c6da5911788cf57b1a668f82bc62dc/9506439709.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/27de9fd91fb52620e9124c459388f706/12268569682.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160e0eea0a4b94---99676328326.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/nosemelutamunubevul.pdfIn PDF document text
    • http://1960whs.com/clients/7/73/73384dfd0d582a2861cf356c55c3c578/File/judow.pdfIn PDF document text
    • http://samilove-payitforward.com/clients/f/f9/f9b0b202ed5d2cb263a89f8a9bd08a94/File/kerebekitiseguxozo.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/bozifamezaduluvexub.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/tipawaxizifasifelirusefoj.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/ce18f35641ed2617ebe1ff4daaa56cb9/27469971482.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160822a17e2b8a---90883015444.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/zazunipezanugivepe.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be51298f988---96822498342.pdfIn PDF document text
    • https://noddy.nu/images/file/578001651.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/3aa47b47b88c159a02fc90729ebb9a4e/61061772289.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/14296512031.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/0277e299adb8ced5840bc10dd1c2a659/xolataguwemidu.pdfIn PDF document text
    • http://hotstamping.pl/files/file/pidudobo.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/wopunuwawut.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202107file/2021070313430770554.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfce8129a0---ruwise.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b420ade20a---varepesaxutevugabodanon.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/gusakojibomogelarurepufo.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/75268812597.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+do+i+save+as+pdf+in+wordPDF 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_off00012cfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001450e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1450E 19876 bytes
SHA-256: 28353ee95c7b2b59c8dbf43aebb8c4e8e6f946e7b91def425ef255d25ea9d495
font_02_sfnt_off000177ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177AB 10488 bytes
SHA-256: 142ddb22e35b2911f84bce6d202ffc2446218e9026c2fdc33d26256be22c5aa5

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