Malicious PDF — malware analysis report

Static analysis result for SHA-256 949198c13a41b94e…

MALICIOUS

PDF

80.7 KB Created: 2021-09-13 18:27:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3dcec39c6d980ad04f2f274787809c12 SHA-1: e544468b8e3f8c93032c7a9521bca4a6713a3769 SHA-256: 949198c13a41b94e19c5903316c03087d3bd2b04b1628c80bb1a0fa5017fc246
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution scheme. The presence of PDF link farm heuristics indicates an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16131486a5cc14---vigilinewop.pdf In PDF document text
    • https://eniedu.com/data/file/20210903120923.pdfIn PDF document text
    • http://pscemetery.com/userfiles/file/12524264218.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/wazagovejukolusipup.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16135e43fe4228---migukuvumuta.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021091307283073499.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/73045532214.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/85260381705.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161370125d6f02---miwapidebaxirozo.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/bukorizetozafinazixivosux.pdfIn PDF document text
    • http://thoitranglani.com/upload/files/sigafodefifovojazixude.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/jugakigoragegufa.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/f7572e8de0b8de95a423be9b1086104e/14068895764.pdfIn PDF document text
    • https://terracell.pt/images/file/mopomi.pdfIn PDF document text
    • http://snp-ent.com/files/fckeditor/file/1432373401613e46732e9c7.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/zadadefubire.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/81924917140.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=master+tamilyogi+2021PDF 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_off0000d72f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF41 17932 bytes
SHA-256: cbab537cd3d4691a1a099aa1dadda1faa915c0c024b5c576dd851d0e532c4e93
font_02_sfnt_off00011d2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D2E 10748 bytes
SHA-256: a6e68b9bf06f89c18df472ca348756743e9fee807dd36a237a7f321cab5df32b

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