Malicious PDF — malware analysis report

Static analysis result for SHA-256 3111a519dcb35c43…

MALICIOUS

PDF

91.3 KB Created: 2021-06-30 23:56:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7e42dfa46a7c8a99a4bf2dc9eeb5cdf2 SHA-1: a438671748f72dbf365df4fa06eaa1cfe1a3cf1d SHA-256: 3111a519dcb35c4374af9027fca85cf1d0cafe0d734b0c239329627f2be23f2b
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://huntic.ru/uplcv?utm_term=low+calorie+indian+food+chart PDF link annotation
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/fc160aff6bc9c87876bd98e23144e3ed/zoloseparirabijipimexu.pdfIn PDF document text
    • https://isosklo.cz./uploads/sotetojigibogivonalakajaw.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/sunanebezi.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/6l38dsnbdrht4sipjf50759clq/tulozobepo.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/65163411949.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/102f6e405b4663f19ec0ae3cdf089f0b/23931547585.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/zovuxametanogadosaruwud.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160957d09eac54---kafebuvedotiduwituvatata.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/dbb7f5f53c5db4a788ef5a6d5414485d/xusene.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6fe2d3bcb6---leradilupuvabuzabodebo.pdfIn PDF document text
    • http://giustizianuova.it/userfiles/file/sowusebawer.pdfIn PDF document text
    • https://2ruoteexpo.it/ckfinder/userfiles/files/93834471371.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/9d765daf922dd52067dfe5f0566a4a58/47756799425.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/jetofibifalonitoj.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/b652970fd40748754016bb84f90550a9/78393836319.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/980761ea5a35bfdb49709cdca581c41f/64065929094.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160806cff6191c---zimunurigukegeki.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/5911048110.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/ickcjo6sqjv0qdosmj589s4a8l/jekafijiverapakefari.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/8032d29c7772a512005221ba86e5a5b1/19237358860.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/nagegabipixukuvupuludutup.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c348d38d6---zezujumoxen.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16090f0957bec2---7890729387.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/bigabemebivoferezefub.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/r639o0i6ok6b1srotd72abu00r/7583948873.pdfIn PDF document text
    • http://allg-gyn.ch/userfiles/file/mexagebexinegi.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_off00010099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10099 10448 bytes
SHA-256: 8a420f93a180176e39ae83b9a4785230fdad9196804f4273675acf296682e473
font_01_sfnt_off0001183e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1183E 18132 bytes
SHA-256: 0ef35686302fb2b9d6ff702243daac274ab08d4b7be7189dea868bc724575c05
font_02_sfnt_off000147d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1