Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e013fb20738f273…

MALICIOUS

PDF

77.1 KB Created: 2021-09-07 00:52:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a817effa7153c8e323dceee0f6a07925 SHA-1: 9b26d3acc0e7859a7ee8eb95427fc0f2994236fc SHA-256: 7e013fb20738f2733737e9a669fe8ea88081ea491cecca8cab2ea5c6685c848b
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

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://parikshitconstruction.com/uploads/bojunibomo.pdf In PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/5ff3cdc72f73d659899dce713e5e51f7/86655662295.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16083bee338e60---ruzubagaki.pdfIn PDF document text
    • http://www.netcorp.hu/data/editorfile/65823794206.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b954c5cf90---80185455663.pdfIn PDF document text
    • https://congchunghadong.com/uploads/files/49077586915.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/tizanexudavumuwuwogomuj.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/lurun.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/qsbn3le675dfen4fvm24a4mg9b/92866788078.pdfIn PDF document text
    • http://alkanboya.com/files/file///59848560174.pdfIn PDF document text
    • http://wrhs1976.com/clients/0/08/080801f2a31a95d446b71e9836a5425d/File/91464598975.pdfIn PDF document text
    • http://jkmdc.com/aversystem.com/userfiles/file/8440391135.pdfIn PDF document text
    • http://sapaethnic.com/webroot/img/files/mawanewodemogomorule.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/21238090050.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd91ea3804c---womixaparezamuxosez.pdfIn PDF document text
    • http://fpole.ru/sadm_files/guligufotupikok.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210718143331.pdfIn PDF document text
    • http://hotstamping.pl/files/file/buraki.pdfIn PDF document text
    • http://asfalon.com/__files/file/99050766075.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/40a8f87604902419b0b4399b9a6a2573/menikomanijasifagewabeg.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/sakoleludetasolode.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/eadcd658963911bec167dc8ced5c3354/87164380614.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=cervical+cancer+pdf+2017PDF 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_off0000cab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB9 17020 bytes
SHA-256: 8bc7e548229fde7615deef7fd16a64d852aac07cb9e1f2aead0a38bfbc5d4532
font_01_sfnt_off0000f5d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010dec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DEC 10668 bytes
SHA-256: 9c37c83633bebc0e5460db672e2c83512cc392e70ce1599bbd4e65aee8247955

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