Malicious PDF — malware analysis report

Static analysis result for SHA-256 396f7f34e9cce0ba…

MALICIOUS

PDF

71.5 KB Created: 2021-09-03 02:35:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b0c4e5319bd88bd3ba1accc7b376a399 SHA-1: fbb957ed27fdd4e3d2645126d022b4f68ac5d078 SHA-256: 396f7f34e9cce0ba58f9f5b5bd2d725c356f76bf2c5a863f7a8ffd5f4f6e8fdc
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs pointing to compromised websites and potentially disposable hosting, suggesting an attempt to lure users to malicious content or phishing sites. The presence of multiple external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://chinocorporatechallenge.com/clients/6216/File/wozikolovugor.pdf In PDF document text
    • https://bulendengin.com/upload/ckfinder/files/27110996353.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/576dcfd2f963921810e07158a7865a76/fukesorifumuziku.pdfIn PDF document text
    • http://mitroc.com/userfiles/file/31456935311.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/safigumutudadufuwepas.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160acce9266da2---rupapopofipafobi.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/97167767363.pdfIn PDF document text
    • http://cdmvt.cz/sites/default/files/ketonidoret.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/rqqe7m6dl5d2aade5310ocltu7/26960007914.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/bunaxugizapegamofuw.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3fa1b68ed8---19243487140.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/84c93fa0ab07a245ffcfe84bd6ac05be/10467265156.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/ae020e8d682841586626fd7d84c0e85b/77463822389.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/siver.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/72319463292.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/aa27936bd80a6d7ad102855ce31c2d6d/dexigopavarifito.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/a0fc461e043c1421e2a92f2d5c8df590/vedifanenejamaminupegi.pdfIn PDF document text
    • http://newcastlehigh1967-50threunion.com/clients/43248/File/lifivalezegutibizawasi.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/f5335f72421827f8020583f873dc4beb/82360961914.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/bamagepofudujene.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/5bsjdb91s7v8n79cmlv6phg6pi/96398530453.pdfIn PDF document text
    • http://warehousetraining.ie/images/miwexowixonotijog.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/ohfqr203khqo84gbnmpehnidog/kuvilenizigemawopezari.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=adding+multiples+of+10+worksheets+first+gradePDF 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_off0000b67b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB67B 15244 bytes
SHA-256: 3978e19a1e0bdffaf4f1b71fb1394165155434ce92227a387fbfa57929c970e8
font_01_sfnt_off0000dd56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f56d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56D 11376 bytes
SHA-256: 23ac13e1880f3fe92432bd355e2256227781e3bf1ef882a9c47b5d08e4a5dbfc

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