Malicious PDF — malware analysis report

Static analysis result for SHA-256 371285e233fe7415…

MALICIOUS

PDF

92.4 KB Created: 2021-09-06 00:44:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4645843557168d3c7c93fe988cd21ea1 SHA-1: 6e2992f6678e3789f46b5daf56d23f5b083172e6 SHA-256: 371285e233fe7415dd32e26557794e8531572a22ef0fc96d3e31aa6495b68a20
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The 'Callback phishing phone lure' heuristic indicates a potential social engineering tactic to trick users into calling a fraudulent support number.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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) 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://chcial.ru/uplcv?utm_term=scan+multiple+pages+to+pdf+canon+mac PDF link annotation
    • http://birnagarcollege.in/userfiles/file/fenufuxuwadanep.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/de795717c79da8b16380aaf11dde927b/vopumuwonaromosixejosaniz.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/35793293624.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe0b7d2919d---mudisavawujoluposipejol.pdfIn PDF document text
    • https://atrax.hr/files/1200998447.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/2d8047958a0d499ffe17377574aabec9/rexojagipelupivexim.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c242433a66c---takev.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/59200573203.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/md6o3aulcol094k0h8prri63b2/xipufofezo.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/cqpf5a5mgo997hqpg23icql8u0/4405192628.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/95178956155.pdfIn PDF document text
    • https://noddy.nu/images/file/dorobazu.pdfIn PDF document text
    • http://fygl.net/uploads/file/131806248292.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/zogafaj.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1606d44083434d---70953371453.pdfIn PDF document text
    • http://evola.it/userfiles/files/99817729982.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/tavilag.pdfIn PDF document text
    • http://kiemdinhcan.com/Images_upload/files/97844365073.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/95801731885.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16125410f5e3df---37610734810.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac2a7f2a19---dajelesizedufunilu.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/fikituvagilirutogumodofoj.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_off00010611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10611 17136 bytes
SHA-256: 9df9b276bd03a26ef524d1efd8a085a02d5fea5b0034968cb4d3e2d1dd5836b4
font_01_sfnt_off000132b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014ac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AC8 11040 bytes
SHA-256: 84a77b6a2d2371004b4504fee6defaa0c0b17e6ca3847346c477c433e8a288a3

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