Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a634f15a07fe141…

MALICIOUS

PDF

87.7 KB Created: 2021-08-12 22:46:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 58be6cc1245e2038f6118f2419ed5594 SHA-1: 8f8da3a8a091f4cb0d32abc2b6509838d4cfc8fb SHA-256: 1a634f15a07fe141c65a0ea377a0f1599bcd0d7eae9752f6f44da4cd93401df9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs, many pointing to compromised WordPress sites, suggesting an attempt to lure users to malicious content. The presence of external URIs and link farm heuristics indicates a phishing or redirection-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://fixafilm.se/userfiles/file/71609866400.pdf In PDF document text
    • http://conomiya.com/images/uploadedimages/file/32697798079.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/8d019b776ac532c604d113184ea06205/ramafutenirixuserutedum.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/wikarimana.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/zunaworozazef.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c646384aeb5---19127952240.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/iqo0ucc93q2c95gfk0icegfe0h/8254948348.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4fa6ad5fe---5799081631.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/snsfc72c0t8cldm8cit0fm8v0f/ragoniwawiteti.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c4b6be620---62842825395.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/sakevikavelovanamobaxap.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/degefamumaz.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/pozexokosiziworenabotez.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/a2ru929rqq4jl75562q5ml1tbi/57133720141.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609c279add385---zojowo.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/32191783783.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160babe7397824---wumojesa.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/19281793187.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/b89a8b0126fa7ddddd7c6b4ccbdf868f/nazer.pdfIn PDF document text
    • http://marty-triple-m.ch/inhalt/files/bunevonijeponir.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/d6fdecaf34aaf60ee7271e4f5251db55/sipukulevinubuva.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/177c0710657e91b883e0ea30cc68c629/muxobewetedotasetifojilip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=baumgarten+aesthetics+pdfPDF link annotation
    • 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_off0000ed87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001059e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059E 11056 bytes
SHA-256: 349cf79340f8c1b09409fe76c42a66bd529cd4db01feb703f3783314c78d5630
font_02_sfnt_off00011ef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF5 19844 bytes
SHA-256: e284f182e0c2444ccff49ca0d39cdf5a2d252c0e4b27908517a04c4098193ba3

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