Malicious PDF — malware analysis report

Static analysis result for SHA-256 edb31f30fa2aba50…

MALICIOUS

PDF

84.8 KB Created: 2021-07-01 15:21:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 7b3edf34e3db0bbbaf584261c895979a SHA-1: 5311e197536749cae3f07461123d9065bbc4b95e SHA-256: edb31f30fa2aba5027f46550c92410d32636c44aa86aa8b02346cf301d9bf56d
196 Risk Score

Malware Insights

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

This PDF document is classified as malicious by ML models and ClamAV, exhibiting characteristics of a credential phishing lure. It contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting an attempt to redirect users to malicious sites. The presence of MFA/one-time-code harvesting lures further indicates a phishing intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://smidgel.ru/uplcv?utm_term=how+to+fill+in+pdf+application+form PDF link annotation
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/f8652d12826e5e54bcdd3d78ce956a38/4715336160.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16080789b89c1c---jafuro.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/72154559949.pdfIn PDF document text
    • http://cipetbhopal.com/webimg/files/jalobut.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/selajejawibizexagipo.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/33bb4cf4664b51ceb7843005918f4386/50305257121.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d036f4dee62---13875944938.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081cb0a3a8cf---ninuvatexuka.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/3929106264.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/54219967571.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f28461be15---fajaw.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16091812ed689c---70667900591.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160788660eaf68---37085255408.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/ritetiseforigus.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/jawuga.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/511d0e1e269e01c684b0bcfa923941f5/10517592923.pdfIn PDF document text
    • http://adamslakeband.org/userfiles/file/82708635740.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/42611121994.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/e88180b5f01c1b9a7a7f8be74532d87c/6493276045.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/wumudureridewep.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/fefejifi.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/44b2dde5200cd518ba78c6fd190aab6b/pipalejusu.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_off0000e807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE807 10560 bytes
SHA-256: a1de593f9127ec128ccc683e2f525782f6afe97fcb2d26e041aacc94568feff3
font_01_sfnt_off00010008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10008 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001181a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1181A 17660 bytes
SHA-256: 1ad0c43dd15196512540a8b428fb436d3d292df4eb68c5dedc14b166e7f95b2f

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