Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e53aac659177125…

MALICIOUS

PDF

74.9 KB Created: 2021-09-19 03:01:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c55676735ac0447444044db68e108439 SHA-1: fd1376c1501aa26ff7cd0fc953acc7cfaf81f56e SHA-256: 9e53aac6591771255ac0bf96431c6d3ae10790751351df495befde098e94df19
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The embedded URLs suggest an attempt to redirect the user to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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=telecharger+gt+racing+android PDF link annotation
    • http://akbarestate.com/survey/userfiles/files/1410065087.pdfIn PDF document text
    • http://leprofit.ee/cmsfile/contentfiles/jujififulanatojafejolamus.pdfIn PDF document text
    • http://itcbeautytrainingschool.com/userfiles/file/pinebegepenifapivivalaz.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/xedisuvozilaninij.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/63698499652.pdfIn PDF document text
    • https://whitepalacegrill.com/userfiles/44197927382.pdfIn PDF document text
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/8731902276.pdfIn PDF document text
    • https://pnlcoach.com/misc2/file/In PDF document text
    • http://blfimmobiliare.com/userfiles/files/bosorosa.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/94357c590ac876a4bf6c1af49ec26e1e/wubira.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613705cc4ca6f---55491056834.pdfIn PDF document text
    • http://ucg-eg.com/userfiles/file/burexikixoxufopiluvom.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/fafoposepurer.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614281062a281---xuwabozilaxibiwu.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/delukafitomerepajevowa.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/84796153957.pdfIn PDF document text
    • http://husplaza.hu/editor_up/buvorixazimilugaxununok.pdfIn PDF document text
    • http://5thaveseniors.org/userfiles/file/5848558315.pdfIn PDF document text
    • http://orenprom.com/img/account/file/nufat.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/160488441.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/14422379350.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c328f4012---nokujekamekugopi.pdfIn PDF document text
    • http://18554080.com/userfiles/file/16904733415.pdfIn PDF document text
    • http://www.ekoforte.com/upload/file/39413902356.pdfIn PDF document text
    • https://kaimano.it/file/36346651676.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_off0000c3db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3DB 10444 bytes
SHA-256: d2e04bcea09a8b489e20e4280144d4bd31b7b10688ebf023fd7b0c3997a107c5
font_01_sfnt_off0000db43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB43 16592 bytes
SHA-256: 15b181805917a4d22f9a8538b639ed020ae3651a99fd5a5ed3d4b68f80107a6f
font_02_sfnt_off00010598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10598 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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