Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d04856bdd5f846b…

MALICIOUS

PDF

84.7 KB Created: 2021-06-29 20:08:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7c14c0d8d61b9502e416a3f14a60d3e9 SHA-1: 0a3a6eee73f386af44422b2fc70853afbe2cf5b8 SHA-256: 7d04856bdd5f846bed317a5c6f0d07c6d2f2bc562310814ef7843f376f244429
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress upload directories, suggesting an attempt to host or distribute malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa8b0ac45a---36210731361.pdf In PDF document text
    • https://bdaudit.ro/userfiles/file/72113696857.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac783185b4c---25543955988.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/68d795cbd4de359fb8e5c4be65d7d975/81909804055.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/liwimokaviv.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/e83ngiadbslggo4aj20mf3eir0/64591650932.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d490b86be---zibidiku.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/98768592758.pdfIn PDF document text
    • http://cn-noah.com/uploadfile/file/33621807520.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/f70b0e173a01c4ca5dcc4b68c66179da/dakanu.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/6341441134.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/0ee47914009139b3b5576aa1ba833229/bekatapebugebeve.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/kanojarurilem.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c1bbf35e7---26311977808.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/ujt8osf875ori771m84aosh1io/sumabikodutibitujesugate.pdfIn PDF document text
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/q926e2grl9038u12ccqpqpqmft/zemabutilasanowikubalofu.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/71404532695.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9524fda704---63197874176.pdfIn PDF document text
    • http://araonline.hu/uploads/file/zezakinaromejapit.pdfIn PDF document text
    • http://aven.su/userfiles/file/82475290970.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/a8c946e81b146545e1185635fe0be523/nagidozafubazok.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c987d0a2996---xubewewugilosero.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/7jm3pqhrkj7jecsnpauf7h0mdm/56588251659.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/kojatuwowuzuga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=what+is+modern+sociologyPDF 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_off0000e911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE911 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10128 10924 bytes
SHA-256: 8493d92a935e1d058032a900c2394e17c46a8bd5c98f5364d42fabe6d5e20372
font_02_sfnt_off00011a20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A20 16816 bytes
SHA-256: 80214474f0cc2d4d8cbb9ff08e779cb3901348c8c172f2d3dd76b3dce5db20a7