Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b22548531a7e23c…

MALICIOUS

PDF

88.1 KB Created: 2021-07-16 09:42:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f87c9d5ee44d45f97fdab794e26b9bf2 SHA-1: f73f38474fca4cc80089d245a4962a476df8952a SHA-256: 3b22548531a7e23c93fd8094e39880ec7b0818ecfa7c0cf263392243873679ed
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm with multiple distinct hosts, many of which are associated with compromised WordPress installations or disposable hosting, suggesting an attempt to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.
  • 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 https://mimpishio1bet.com/contents//files/39770477968.pdf
    • http://tantex.org/tantex/tantexuserfiles/file/20296926552.pdf
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/ksgoe6qrqedu2b1hjmteu3g8mm/bezorebawutiwexuwokatatoj.pdf
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/205364da2dd9844a09c79a3a88c1b8b5/91237150737.pdf
    • http://dush-kz.ru/uploads/fck/file/nijofikegamiwoxinotibu.pdf
    • http://studiotecnicobonoli.com/userfiles/files/karofotokobe.pdf
    • http://gold-carsales.com/js/upload/files/23910037518.pdf
    • https://baigiangtoanhoc.com/upload/files/98427432254.pdf
    • http://budohurtsa.pl/userfiles/file/zujezibobimifolorexopafev.pdf
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/e63cc795e57af7786b670de970e8e93e/xawarevitobagupovema.pdf
    • http://jaatkinson.com/userimages/radutize.pdf
    • https://citronel.com/userfiles/files/64373160833.pdf
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c78a5de1a1---genopudanaxujufewasusuw.pdf
    • https://phr4u.com/files/88164989478.pdf
    • http://www.pvvc.cz/files/dowuf.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a49fce41668---kedirivu.pdf
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/3bg48kgh7hp3qd41g59e9hgbb1/depurugapilixugutilelone.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/d4re4m6ho56pj2palkqufb96cc/vomibogemeraju.pdf
    • http://dush-kz.ru/uploads/fck/file/23985204272.pdf
    • http://cngwalk.com/fckeditor/userfiles/image/65911429050.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/d4f6966b87f50853563a1c434272895a/dinumuxuxatuposorilute.pdf
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/e94adc7c74ad8d72fa9d8868dec15d4d/55089982266.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a1252f551c6---zokazadekexirupatibulof.pdf
    • https://audit-advisers.com/userfiles/file/42959638626.pdf
    • https://tonitomov.com/picture/file/xadufoxagakojewi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=mike+teavee+willy+wonka+and+the+chocolate+factory
    • 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_off0000f062.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF062 16792 bytes
font_01_sfnt_off00010874.bin
2cb76faca33170913a53b806afc26740b85446d3436722466b861b4941ddd9d6
pdf-font-stream PDF embedded font (sfnt) at offset 0x10874 18060 bytes
font_02_sfnt_off000137f3.bin
128d59bb6c1aa6d9c6fda7c644f015a9521eadbaabb6b4d3c148ffe0a8aa4bb3
pdf-font-stream PDF embedded font (sfnt) at offset 0x137F3 10756 bytes