Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a901dba4fcab102…

MALICIOUS

PDF

70.8 KB Created: 2021-09-15 19:15:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e166bee078e29286ac08dcd6aac321cd SHA-1: ec9305a6ef63d3570468ca5fd363ecad5487f07d SHA-256: 7a901dba4fcab10243142fd57d3b7534bc0938a4505b92e3e0bdf0871346abf3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting. ClamAV detected this as a phishing trojan, and the ML classifier also flagged it as malicious. The primary function appears to be redirecting users to potentially malicious external sites, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://philabc.ru/uplcv?utm_term=explain+six+thinking+hats PDF link annotation
    • https://berbagiangka.com/contents/files/pupug.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/161302fbc4dd5a---nezizegow.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/94533797354.pdfIn PDF document text
    • https://cqhuaan.myhost360.cn/upload/files/09-04-19-18-14-54.pdfIn PDF document text
    • https://sieuthimaycafe.vn/uploads/file/38097260200.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/sakigodug.pdfIn PDF document text
    • https://majubesar.info/contents/files/13665487495.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/zogemulijuzosuraw.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/87255057181.pdfIn PDF document text
    • https://theptaynam.vn/upload/files/63351537864.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///denokemerugofivufitunilu.pdfIn PDF document text
    • http://rld-carbon.ru/file/66483707476.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/39789503559.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c685e5d05---46537174810.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/27848537054.pdfIn PDF document text
    • http://marine-inox.com/i/File/97406237493.pdfIn PDF document text
    • http://ikra-ekb.ru/files/fckeditor/file/kakijuk.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/8e7ae5eefc57a59f3dec906f9cdf5edd/niwajikalererulusija.pdfIn PDF document text
    • http://cualuoiskydoor.com/webroot/img/files/xovovenabuxadipa.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/14589695527.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/06a55f2ee88a3a6e983fda2e40a543ea/74981673678.pdfIn PDF document text
    • http://ecpa.fr/uploaded/file/98155847620.pdfIn PDF document text
    • http://synfarm.com/upload/files/wuriniradobifobuxa.pdfIn PDF document text
    • https://arabadvertise.com/userfiles/files/35867172332.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/xaxubajilamew.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_off0000b59c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB59C 10356 bytes
SHA-256: 7ce8da8822e67856a111f27103f2c556d9d905162d9aaaa4119930b692ad9c02
font_01_sfnt_off0000cce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE8 16392 bytes
SHA-256: 8d81fec11e7a5ed909ade821e6c1e6f5eb3a42f80ec023b01c5fbecaeb4aa9f6
font_02_sfnt_off0000f5e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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