Malicious PDF — malware analysis report

Static analysis result for SHA-256 af1aa28e5d3e86bf…

MALICIOUS

PDF

77.5 KB Created: 2021-09-04 02:15:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 6745adc4953f5f7cf2eedc9da1fa17cd SHA-1: cd4a05007a7742d25ce380e7b1aab0f42d4a6475 SHA-256: af1aa28e5d3e86bf4c9f50371c1e8cb82ba0f91e0c0400009d1938d8cf7597b7
196 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing lure. The 'SE_MFA_LURE' heuristic indicates it's designed to trick users into providing one-time codes or MFA approvals, consistent with credential harvesting. The embedded URLs point to various domains, some of which are associated with compromised WordPress sites or link farms, suggesting a distribution mechanism for phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 http://macabrey-luthier.fr/data/Files/36167821444.pdf In PDF document text
    • https://mosallaesf.ir/uploads/ck/files/visamujebaz.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/e9ba9a6564460b726e1ba6c719caa3a8/34519312621.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/28337409151.pdfIn PDF document text
    • https://used-machinetools.ro/app/webroot/files/userfiles/files/nonozutitulijanobapedu.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f15e8b3eb28---muguvomevutodumuzokureso.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160915eded6d48---68837511393.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/fitododufekodut.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/18918302548.pdfIn PDF document text
    • http://gardensyellowcab.com/admin/images/file/88427928078.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/likedinedifenadokexafiw.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841c35385a3---45888684868.pdfIn PDF document text
    • http://meta-min.com/files/520821011.pdfIn PDF document text
    • http://graciaindoutama.com/kingkong/userfiles/files/85584395996.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c6dfb100348---judomusugobaloriferuwer.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/3b70304fd7878aaca513bacf22178e02/dedum.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a067e849d12---69031245398.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/98580c131a5cc8afce1836a48c60fede/99132750153.pdfIn PDF document text
    • https://bookatowncar.com/userfiles/file/1464177041.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/40430434031.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/64653249416.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=soporte+vital+basico+aha+2018+pdfPDF 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_off0000c787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC787 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9E 11396 bytes
SHA-256: 6f6b8d453545376014c06ccb6b39f90927762eda4c9f9d37a6ffb82b9c786db4
font_02_sfnt_off0000fa6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6F 18160 bytes
SHA-256: 6bc2568d7b3e540529769f7ae76b02a6f36913bb30c770f8c49d613b813710ce

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