Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb3abab84bbb5af4…

MALICIOUS

PDF

87.3 KB Created: 2021-08-29 10:25:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b3c6c7e3f3cbc2c9c2db0eeb35cd89ca SHA-1: 48f48954cd0d2ba35edb557cc65a0bc9a4e9fbaf SHA-256: eb3abab84bbb5af426def80968a25b0f9ef8a34c02cd246447d135fe24e65b5c
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure indicate an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 6

  • 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.
  • 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://wastran.ru/uplcv?utm_term=pokemon+fire+red+game+cheats PDF link annotation
    • https://alternatifhirdavat.com/upload/ckfinder/files/22430730388.pdfIn PDF document text
    • https://digireg.nu/upload/32309346248.pdfIn PDF document text
    • http://gaziogluenerji.com/images_upload/files/64073872833.pdfIn PDF document text
    • https://mzlpro.com/web/img/podborky/files/62224228862.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/92868697417.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b85e1c3857e---54826404345.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fff76adece3---99082967361.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/8c11faa607773a154a5d84d83c911920/wikiguzaregaxiviresewenu.pdfIn PDF document text
    • http://hflbdq.com/uploads/file/25191349625.pdfIn PDF document text
    • https://matteagianotti.ch/userfiles/files/toxafubetezesepulisa.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/bebopiwu.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/c819ha7ag90fnsa8kib3v6tmgd/12701070428.pdfIn PDF document text
    • http://thebrownbag.vn/upload/files/lobudelege.pdfIn PDF document text
    • https://bselink.com/userfiles/file/5513370292.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/83ed1ac5d920c679f6d5228a47f2c920/26099664371.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/benabebifobepob.pdfIn PDF document text
    • http://hhtaitung.com/CKEdit/upload/files/finikibavudemufozanib.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/827eaefe58abf0cd68867a05688c9924/fejefaraj.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/gupulezogitofapala.pdfIn PDF document text
    • http://faxik.ru/ckfinder/userfiles/files/nezufevovimifiginoxi.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082fcae51624---xuvolofogedowezamalefo.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/zugifurilenurisumodob.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/zupolubapemekeguduf.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/fopulumajidaxatenojuvesu.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e2d990bea---16803968994.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b10d53e7baf---nobuwil.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_off0000ebfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFB 19312 bytes
SHA-256: 35be0322e67f1e95baedc86891ed25d1442a72776c2f485569b4ad46d87d4f0b
font_01_sfnt_off00011e58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E58 10972 bytes
SHA-256: 94f6520a14c4f822083c8e8d95640beb32a77fd3e233f3f632b95a543e9155d5
font_02_sfnt_off0001376f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1376F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1