Malicious PDF — malware analysis report

Static analysis result for SHA-256 815263ef43f0af60…

MALICIOUS

PDF

79.5 KB Created: 2021-09-03 04:56:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d8dcc8b7943b7204c20e864fb3b09462 SHA-1: eea55f77e7187d05ce72e7cd6263fe2ad0cb81cd SHA-256: 815263ef43f0af60e50aead65577f9cfb3e6f31a91732a7d6fd5cd92cae6bbed
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing or trojan. The heuristics indicate it functions as a link farm and a callback lure, prompting users to call a number in a deceptive context. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics suggest it is designed to redirect users to malicious sites or initiate fraudulent phone calls.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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) 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://coretry.ru/uplcv?utm_term=content+and+discourse+analysis+research+pdf PDF link annotation
    • https://cargobull.cz/res/file/92286064221.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/danawozov.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160850f80e7de1---xisexexexevufexowujeva.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/19732205197.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/dh70ep9mq6omp4eero0b4l8876/galinodu.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/6ed2np0dhupqk589kk3j20aqv1/sipugegew.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b589df95b79---8743389116.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/98029882443.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b3f0743bf---xopariritubosumokonozer.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e01e6ca6eb---39515308723.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/fb0f906ee12860ee5a46f3e88da83a06/kadaxizuromipogosev.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/jenazu.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f07d72a2c5---selejotut.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/cf9456695b199a169850ab770d2ed5f7/65920253290.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/41270218651.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612e7301f0d01---munigute.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee69d477c4---bakosuzavezoguzipateved.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b12d3668c---pogegugafirexumibusevoti.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/58fbe1545606541a3721ce089b511da1/biniwikegojinaxalu.pdfIn PDF document text
    • http://mrpokedb.com/uploads/files/14239165663.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d03db3a5fc---32467585459.pdfIn PDF document text
    • https://mangmalungtea.com/userfiles/file/24923672554.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/fuletofamovuxodetasofa.pdfIn PDF document text
    • https://leuphuotcamap.com/uploads/image/files/zasiwusaxamalikozerirasi.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_off0000d32a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD32A 16884 bytes
SHA-256: 6b7282d217e3b82623615b2231f28c81a86f82735a40fad71b4bfa4360fbd5f4
font_01_sfnt_off0000fea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA8 10960 bytes
SHA-256: 6bcef45e2b1bce1efab8566f463193b4d8137e037b317ba3ee061e4f4cf44b2f
font_02_sfnt_off00011818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11818 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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