Malicious PDF — malware analysis report

Static analysis result for SHA-256 79646650da3ee824…

MALICIOUS

PDF

85.8 KB Created: 2021-06-29 11:02:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4508d90a8c6d204f053ba8414abc7643 SHA-1: 3986ffc5bcf5332899235d169c441131a2a103a2 SHA-256: 79646650da3ee82414f75e3b4d3e5d674d38e0ce7346ec9458adb17edf2f7fda
216 Risk Score

Malware Insights

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

The file is a PDF that contains numerous links to external resources, many of which are hosted on compromised WordPress sites. The heuristic 'SE_PAYMENT_REDIRECT_LURE' indicates the document's content is designed to trick users into believing there are new or changed bank instructions, a common tactic in business email compromise. The presence of ClamAV detection and ML classification further supports its malicious nature, likely serving as a lure to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/cebc8b44bbd79636104fd3c8b94c47c9/79515808320.pdf In PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/72c5c16b90063fa1f37324c885caaef1/busawoginoruzug.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/8af842bedcd898d457c6f60c087dde11/ripowetaxaruxibaponu.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/vujuzejumijivewotujip.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/84151615554.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/48371891303.pdfIn PDF document text
    • https://puppometalli.eu/file/68869419573.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c99e1e995---nolulekizizususojelosi.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/94445588875.pdfPDF link annotation
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2528d09c5---mumaxokanejabunopevoxeba.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a271af84a8e---nekezefazitoxe.pdfIn PDF document text
    • http://siembra.me/uploads/files/mimepi.pdfIn PDF document text
    • http://olympusflights.com/files/files/70588427686.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/kopopuwivedipolodakuvovi.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5166977dc---18960061245.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798c3901cd6---xetagafojenijosukev.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/fudame.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16077519b79489---110790781.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/9a3a022cfc0611fad8c64fd8d816a078/duxigarin.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/30324465007.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609f06d8bd921---sovonojogovumawunit.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/nukagokadibivefugujawobon.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608190f19c788---lipem.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/d1673ed5ee0ef6d9b88ea38f33194ecb/jaxijuvujitija.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/3829621391.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=employment+contract+variation+letterPDF 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_off0000edf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF2 16936 bytes
SHA-256: 7d6c4bb276ffc5bb17b958b13584163920b6aaede0bb4d46be8bc5c1a5331946
font_01_sfnt_off000119c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C7 10532 bytes
SHA-256: f9cf8c6fa6ed9db47f95fdc28f970c448e61c5108c58b4b9567d4704d8e7625b
font_02_sfnt_off000131c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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