Malicious PDF — malware analysis report

Static analysis result for SHA-256 2149bcb0ccebf7a7…

MALICIOUS

PDF

83.7 KB Created: 2021-07-08 09:04:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 63fe1e95c56f73c834d7a7fdc37a3161 SHA-1: 082e10588629939eaef1c5063337e7009d672b94 SHA-256: 2149bcb0ccebf7a7daeae40d8e64405f7f740caff8fb59dc890084f6440449f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The document's structure as a link farm, with links to potentially compromised CMS uploads, is a common tactic for distributing malicious payloads or directing users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://archism.ru/uplcv?utm_term=factorial+of+a+no+using+recursion PDF link annotation
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/bbf8c70b4cae4f382ef4e3ecdd23f385/zopuzu.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608fcc0ed2cb9---7310736827.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-4-29/20210429043915885575.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a23f9025ab8---vozisetovedatuxutab.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/4tvorcogj4aqftq1f4mboq5f17/gabuzanibun.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160d92e4189e24---57982081006.pdfIn PDF document text
    • https://longhoang.vn/upload/files/38698026160.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608d043ab14db---dezevuwujirisuw.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072a244bea36---43094017985.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/95fa99a22a1a0af5c1778f84e1baed20/19509715364.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/fikutukefibegowolobowut.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/xuduxumadazajulafobujus.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef8ae7def0---62540314935.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/33977401200.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/60a02876ac27f1dc838eaceaf99ff9ac/17618705600.pdfIn PDF document text
    • http://sneedfamilyct.com/clients/44919/File/jivijaravi.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f1e20b7e9---ninalofasexutituvozudilut.pdfIn PDF document text
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/qa7qgcn7m8gb50ik4lsol8nrv5/bigevejebo.pdfIn PDF document text
    • http://lpsa.cz/userfiles/file/73054984525.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c861dfcf6aa---zodajeta.pdfIn PDF document text
    • http://www.emailposte.com/pictures/94988160079.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/zazubupi.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/78312356352.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/cbae9ccfa206cb6a0d73c284ff02d7d9/30977749577.pdfIn PDF document text
    • https://kaptenhoki.net/contents//files/87840516132.pdfIn PDF document text
    • https://eagle-aviation.com/userfiles/files/74639053791.pdfIn 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://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_off0000e02a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02A 17796 bytes
SHA-256: 4873046ab0291fff178b7b5ad7e036f48c4d8ff274d297fd00034bf57463c6f4
font_01_sfnt_off00010f3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3B 10588 bytes
SHA-256: f8ff40651db798c64e1af65505c3982ead2576121010a14fb5f4a1f54496e160
font_02_sfnt_off0001278f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1278F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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