Malicious PDF — malware analysis report

Static analysis result for SHA-256 cabf0166c221787d…

MALICIOUS

PDF

74.1 KB Created: 2021-06-12 23:52:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 256c3c9b08fdd8f3d7e439d3dd04cf68 SHA-1: fe5e2c8996c79a6dd8c374e4a54129e3db348138 SHA-256: cabf0166c221787d5f7240d2873b59384d5268c7c0585f53a1b022b83bc5ef42
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a lure promising free gold bars for a game, directing users to a URL that appears to be part of a link farm hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://irlanc.ru/uplcv?utm_term=get+free+gold+bars+candy+crush PDF link annotation
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aca1401ea65---dubomovozegasotifosi.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fe99714bb---fuzigexepoxogezerak.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/d48062b3336a144d7008a7753bd1f804/9860088067.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0628fdfc6c---visarigap.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/vuxul.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/cb7fe07a5f4aec7fcac3dd6a4ead1668/jezebobezamuzedadepisave.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/d9293edf14dbur5lb9kt1ch2mp/81811316319.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/bf759614fe1e735acdd441d5833470e9/befenowakutib.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccb7f56f27---godiloxewuximir.pdfIn PDF document text
    • http://hilltop1976.com/clients/24685/File/14553884928.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071685c1e022---fileberep.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/3b24c4ec358a1c110db53bbab942e5f2/rixulalaziwololudem.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/7b3cdbf1e072a19383e593be666ba270/jejexe.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/muzofupumaligetiloweva.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/qpuo36bhlcmpn9hs9v7uqkotts/zamawazikubikabipafaj.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/koponujotobesilofi.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/a9337406cf90585fa00d9fce18c742c3/zebivexamovobilena.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE177 5556 bytes
SHA-256: f43901bab8c233b66eea2c18792056590016dc61f8e1460cd88576c2a85d6b18
font_01_sfnt_off0000f45d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45D 11604 bytes
SHA-256: ca8ef86a4425733d2946123b60ef356a1d3c640f94713d3b159c423e52698d5b