Malicious PDF — malware analysis report

Static analysis result for SHA-256 c734dd2caaaed686…

MALICIOUS

PDF

79.3 KB Created: 2021-08-07 15:42:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 1001dc93dcb6620178862fe706f648ba SHA-1: 1a2338e740a2710654c0f1fd0af631396b5e4de3 SHA-256: c734dd2caaaed6867c73ab857449d072d496f874b2df1d9a07c823668a60c474
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs that point to compromised websites and potentially malicious content, suggesting a phishing or redirection attack. The presence of multiple external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 https://philabc.ru/uplcv?utm_term=field+and+stream+1871+gun+safe+owner%27s+manual PDF link annotation
    • http://studiocommercialedelpiano.it/userfiles/files/6442628193.pdfIn PDF document text
    • https://lederstuhlshop.de/ckfinder/userfiles/files/neludedesimusotobejoziwor.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/f2r26670fefpft3jumts8i5cs7/sefovijesori.pdfIn PDF document text
    • https://avenue102.com/uploads/file/nosojimafezinedejugefal.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/vodigo.pdfIn PDF document text
    • http://maturitni-ples.eu/UserFiles/File/68245696662.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b8141d4f39a---65480224669.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfd95a967b5---59623704784.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/0rkqb7a9s5s465p62glff6253e/58625090133.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ebbbf386aa---94741269711.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/powiped.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/manokeveganixefenukupotaw.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/bukutotenanaxaxigaxus.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd4bd2f60c---riwevix.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16097cf3cc0802---felojux.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/64169776541.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/90282169461.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073621c06d31---81200589315.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edefb1b8b43---lazevaxowepiga.pdfIn PDF document text
    • http://hyperasp.net/userfiles/file/63981567864.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/nirixusi.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1607202d9d0ebf---soxusekeruvoluruwokulid.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/ea1e10e244ebffea4b866d689fc5d5b9/zajuseta.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_off0000d055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD055 16628 bytes
SHA-256: 296e9302e7aeb9715c13142187217f42bcb1f8bcab7b30e1675399aa4c4a58c1
font_01_sfnt_off0000fbc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113DC 11204 bytes
SHA-256: 9ac46c97ba9b26f8b46c6ff8199a7b58ead55dfe357c46d88254a463f4476ee9

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