Malicious PDF — malware analysis report

Static analysis result for SHA-256 6669a55cfe0b0975…

MALICIOUS

PDF

85.5 KB Created: 2021-06-28 04:56:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 62d8d70e6fe817ec8b2822f2cdc7e833 SHA-1: 4785462bd684b002bb52b784416d6d65a4249fa3 SHA-256: 6669a55cfe0b097514c03977aa2608264eb6ee27e1a86874798c5982b9aee74f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a callback phishing lure, instructing the user to contact a phone number under the guise of a billing or security issue. The document also contains numerous links to potentially compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content or download further payloads. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • 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) or Microsoft license-boilerplate 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://archism.ru/uplcv?utm_term=cupped+hands+drawing+reference PDF link annotation
    • http://kayapaliinsaat.net/file/zajux.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/23134286323.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/nerasamolovutemokusabajis.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5adcdea8df---38916381298.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/7d116dad718e05df89d66b001563ae69/tixupafivifiwusolaz.pdfIn PDF document text
    • http://daming-school.com/userfiles/file/73998263164.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/60r9ojpet46fh2dnbt5be0lgbh/guzasutagutowusujawiva.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bad04657fc3---xajipukiketuparodojumonik.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/23103079404.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/losefopijejuvukija.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/zuworol.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ac18d3cea---worevigerisutaz.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/kipavuwudipop.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/54952588731.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/37562954174.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/84289854352.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/0dbbf6ed97fb201955a53bd3387df6e3/gofakezitakabafefofijiwo.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c44137348---446004390.pdfIn PDF document text
    • https://numberonerevolution.it/file/rigavurogiwereranuri.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/95320455408.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160987fb71ab78---makapevonijop.pdfIn PDF document text
    • https://loctra.net/userfiles/file/80961106461.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/b002514f5ecba2eb4e264839eddbc66a/togofiwoxatanoneraso.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EA 18628 bytes
SHA-256: 59bb734771bc0836808a60a41db985707f7d26751791ace48870b4f163d59c1a
font_01_sfnt_off00011633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11633 10852 bytes
SHA-256: d7846a3d06b34004012d4640dc711efcb90e6247451f3723c7dab58002fe1b80
font_02_sfnt_off00012f12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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