Malicious PDF — malware analysis report

Static analysis result for SHA-256 641a86bff62934e9…

MALICIOUS

PDF

81.6 KB Created: 2021-09-12 23:57:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a16eec26adc13f0c12048d8bae5cd15a SHA-1: 0880327fa2d96ceacce3e2de6cc0d56b720377f4 SHA-256: 641a86bff62934e95cde4a2b4e82f38277858525516e427333991e8bf5b4319d
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting it's part of a phishing campaign. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's intent is to trick users into revealing sensitive recovery information. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://goldartline.ua/userfiles/file/dexor.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613607f2a19c1---43837826429.pdf
    • http://www.pilartangguh.com/file/3380062854.pdf
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/a8fbfd8959156c2765c12e74ca2c2fb2/dotuwetudofazosetugeju.pdf
    • http://volker-issmer.de/userfiles/file/54816528048.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/84ac8aa5376bfd85be4e060473c04ddd/vigunotuvugixoj.pdf
    • http://design-klasse.de/ckfinder/userfiles/files/pavegizuxogise.pdf
    • http://ozona.pt/js/fckeditor/editor/filemanager/connectors/wysiwygfiles/file/78749006329.pdf
    • https://serviceelectric.ca/userfiles/file/lidojokodaduguju.pdf
    • http://qdjshg.com/files/file/22317364106.pdf
    • http://bhttourist.com/upload/fckimagesfile/41962627282.pdf
    • http://xz-brand.com/ckfinder/userfiles/files/30193468250.pdf
    • http://daiichihr.com/uploads/news_file/22866472572.pdf
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/aced76b7a1910b7bc06171a5c3ae3bdf/63368826746.pdf
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/dalurowid.pdf
    • http://gearcon-eng.com/file_media/file_image/file/46590480280.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161368a3a4cd58---5535057435.pdf
    • http://dioceseofniranam.org/userfiles/file/21738832624.pdf
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/f314668c3d05775496ce90ec6d14deea/detubobunurajezazuxigadu.pdf
    • https://kaktutzhit.by/uploads/files/67634638325.pdf
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/zufoxifa.pdf
    • https://nordavril.com/userfiles/file/14614886768.pdf
    • http://speckrepeg.by/UserFiles/files/worusisoxujam.pdf
    • http://monarchiaerembolt.hu/tmp/19513405977.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=epic+games+apk
    • 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_off0000db05.bin
771b6a2f5643a97ff58413de9ad6aec74a598292d1e6696d1cf07c1f697d0a5e
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB05 10324 bytes
font_01_sfnt_off0000f265.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF265 16792 bytes
font_02_sfnt_off00010a77.bin
be50ad85e98b422c2320fffbc1d4ded40ed40e6533a6397d14b69cd8b34da156
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A77 17892 bytes