Malicious PDF — malware analysis report

Static analysis result for SHA-256 9daaf635d512f93d…

MALICIOUS

PDF

85.4 KB Created: 2021-06-26 21:03:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3f907ed32090af3319858bb1da3d407a SHA-1: 4e63a3cce184a1a0c54f94181cd508bc49dd7cc5 SHA-256: 9daaf635d512f93d30c09cf289e855ddf32855cf79122cc1a9d26369d50fd949
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it's a link farm and an advance-fee scam lure. The document body is heavily obfuscated, but the presence of numerous links, many pointing to compromised WordPress sites, suggests an attempt to redirect users to malicious content or phishing pages. No scripts were extracted, but the PDF structure and link farm characteristics are indicative of a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/4895ce9168c7c83964aface8c3dc8300/pofin.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608312e731513---25483844626.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/u4f6bdcvvjo9m4qa1jtndh41c2/megakog.pdf
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/xagorusopobosixo.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ada7cdc5901---50396875607.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/ke6tqjvf5m3s9mcgadbsv27tgi/gamobiban.pdf
    • https://people11people.gr/uploads/File/mujepoferataruruwixegata.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c580a9ec840---56701479384.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/jre4tk6uqk8uhsb08msn5lo3lc/fifilokividewisuwudabolow.pdf
    • https://roweryelectra.eu/app/webroot/uploads/file/16199847518024.pdf
    • https://fullgame.hu/uploads/files/37274884971.pdf
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/1f1c28948dc6ff4246a293503ec6e8ea/49628482676.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bef7fee342e---futalepazesivem.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160bcee459142c---40037476786.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/f9ls3gkc3q90cobm9057l3pa15/59907312126.pdf
    • https://areicon.com/images/file/4295077269.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1ae65e74d---bupasina.pdf
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/d0759f6224bb09b0fb5d9b7fa5ac33fa/bozokusinejoroxaf.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160c0e5790e258---turuvonukukelove.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc6714d37a---fawuseb.pdf
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/q6bftg3t41aekbl4jqcuvel1a3/90199652431.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c614bfe161f---xijijevaxup.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=physical+education+learning+packets+2+badminton+answers
    • 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_off0000e72d.bin
988234f868df2a935fd0fdc252f46dfc0ef624b582d781b8cdd6d970afb4c769
pdf-font-stream PDF embedded font (sfnt) at offset 0xE72D 17524 bytes
font_01_sfnt_off000114b1.bin
158bb3d9bfb508ccf8b919ffa801664eb3a9938664ad2133efee365926faa56e
pdf-font-stream PDF embedded font (sfnt) at offset 0x114B1 11616 bytes
font_02_sfnt_off00012fd9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD9 16792 bytes