Malicious PDF — malware analysis report

Static analysis result for SHA-256 983b3c2db02f0837…

MALICIOUS

PDF

90.7 KB Created: 2021-06-26 09:05:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0ece30e8058d12c1129ffb28b5ff6a1a SHA-1: 6f0311965acfbb15d3602c11a3b0b886b8eb91e0 SHA-256: 983b3c2db02f083770ad6b896ea260b2cfc599b17ed7994f259da71e9e036908
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=i+fall+in+love+just+a+little+old+little+bit
    • http://shipsupply.ru/userfiles/files/valuwazoralazogugenoja.pdf
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/85196ae09e65d63d9b94ece2ffacd148/49307893135.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/plua0udb728tct55859krgabs4/8163443776.pdf
    • http://logiccpacma.com/ckfinder/userfiles/files/91873552647.pdf
    • https://facades-et-traditions.com/actualites/file/67905115488.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c8e7772b6---vewiwejufazug.pdf
    • https://pharma-tools.eu/galeria/file/77548556191.pdf
    • https://bistakalikotenetwork.com/userfiles/file/46283470886.pdf
    • https://skvacations.com/userfiles/file/28824418638.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c92d847665---39583092244.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607376e704ba9---15539930962.pdf
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/qkut8m7tpgje7m88548m4elsih/68219384666.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c885d89941---biriletotafedixawuwew.pdf
    • http://booklandbooks.com/userfiles/file/71114546116.pdf
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/6746014713.pdf
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/d77fe69441bf839ce61888225f863088/17762431237.pdf
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/ae895c3cbe5e194ac1a38a92a45fb42b/23146822754.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/ad1e98690d68dbbe6ac3b2638be415df/zuzebofut.pdf
    • https://alnahamgroup.com/userfiles/file/59946218326.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1bf180de8---jatajos.pdf
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/sfgnle3jcne8fvfkbk1krbois0/25846168663.pdf
    • http://perseverance.cyou/updatefiles/file/69001836029.pdf
    • http://cuanhomkinhtoanthang.com/media/file/85738987098.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afff86c5032---refufijibibakasivopajom.pdf
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/5p6b338idb8mdl6d4c8pijjm85/tukit.pdf
    • 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_off0000fd5d.bin
68aa282f5bc33e3d42d326958b7340e4af92b2b1642351dc732590016a589c17
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5D 18872 bytes
font_01_sfnt_off00012d94.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D94 16792 bytes
font_02_sfnt_off000145ab.bin
3c58627bb318f9b67f32a39838f1522b8a67587208daf94470f9877c2ca9bb5f
pdf-font-stream PDF embedded font (sfnt) at offset 0x145AB 10632 bytes