Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8b6afc0fea3c437…

MALICIOUS

PDF

90.9 KB Created: 2021-08-14 17:45:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 083d7d809fa3ab283b74b9f00477c5b1 SHA-1: 497ea6552daadf56761b054b2f6b0ff853918f81 SHA-256: f8b6afc0fea3c437bda7fb376f19ba416c920ba589187cf8bbd214cf9c3d55ee
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The heuristics indicate it functions as a lure for credential harvesting or MFA abuse, directing users to external URLs. The presence of numerous links, many pointing to compromised CMS upload directories, suggests a phishing or spam campaign. No scripts were extracted, but the overall pattern points to a malicious document designed to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://nomylo.ru/uplcv?utm_term=jazz+free+internet+code+2020+50+gb PDF link annotation
    • http://studiodispirito.it/userfiles/file/nixujabajaposevisonub.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/75623431501.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/6f33f949047f0a21a19c5cdb3a90979d/73648823697.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/isvjmppfthl56mfm3g4di0vni2/99047418489.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/elggqbee3m88qgtald9dli2b89/nulenogumizegelazojafok.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/nanevuwon.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/52207739603.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/91407681545.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2c82b24a7---92077363964.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/3915531015.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/fakubakuxiwetitigaxegir.pdfIn PDF document text
    • http://zbirozskepodzamci.cz/userfiles/56393432536.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/pfj61vimnkb1m5n6idnlcifu1e/19826912908.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/5a9a85b79a06b3aaa3f9cd25df807e18/590911257.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/zamotajutebiba.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/28757756620.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/3bdad998f7e35647200b038e3cd18b6d/92414405254.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/5489cf7640a05280415c6a4962332828/nugedavinojebetipunujig.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-1/20210501180851766164.pdfIn PDF document text
    • http://riversedgefm.com/files/file/50302799883.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611780cb10ae0---6769892546.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/532ad93e22076d3160da2540cb378691/29317590854.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/0a5befbc56319bf5ad8144bf5f749da9/misematovoxokewemiwuxig.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/249ef9690021b3380a5cf2485fdf3b47/78527512690.pdfIn PDF document text
    • http://abwessex.com/uploads/files/fepowijirikixuzopemoturo.pdfIn PDF document text
    • http://locnuocvietmy.com/Images_upload/files/92066541885.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/61277563941.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_off0000fcaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAF 11004 bytes
SHA-256: 019f10af2588fe0575c02abb1720d817ec0ef2386c8144577d6beeb17d93d6aa
font_01_sfnt_off0001164d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1164D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E5F 17952 bytes
SHA-256: c85b141ea9e7815b81b00de3682254a50ec93982fa46a31c1b204803553c99d9

Open this report in the interactive analyzer, or submit your own file for analysis.