Malicious PDF — malware analysis report

Static analysis result for SHA-256 5919f85e99de4fb7…

MALICIOUS

PDF

80.7 KB Created: 2021-09-01 06:27:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bcefc8c4fb020c7d94884c984d638e06 SHA-1: 48e122634efbab38e4cfba8aaaaf861a2c79b39f SHA-256: 5919f85e99de4fb7dfeb7c28c2c7282514066af5263b818f50affa65215911bf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or conduct phishing attacks. The presence of external URIs and link farms on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • 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.
  • 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://drafthe.ru/uplcv?utm_term=in+h2o+to+mmhg PDF link annotation
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7abfed916---bitamit.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/633163491.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca55dde706---nemuwajewupa.pdfIn PDF document text
    • http://www.farnostbobrova.cz/ckfinder/files/bidipakanabarewufa.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607198dada4ff---wuropaweropovenotixebuw.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb20e720bb---wuradiganodum.pdfIn PDF document text
    • http://citranco.com/users/files/16902500865.pdfIn PDF document text
    • http://vrieshorst.nl/images/uploads/file/16982969365.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607047012e8b1---finizimojoveriparoki.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6e70562bd---wozazupazoduxo.pdfIn PDF document text
    • http://clinicaveterinariagoitese.it/userfiles/files/88938904316.pdfIn PDF document text
    • http://medtravel.lv/images/hand_uploaded/files/mukegowetavedadezileru.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609038863cce5---kukurowatibodezex.pdfIn PDF document text
    • https://irrisyst.eu/files/file/dataxusakavebekug.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/94353160190.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4fc7472f8---modomawifek.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/97816511877.pdfIn PDF document text
    • http://vita24h.com/uploads/userfiles/file/gumevimi.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/gfbeoj7ope1qk7n4e09uge3rgu/64152828604.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/51731328045.pdfIn PDF document text
    • http://thueotodn.com/uploads/image/files/kiredunod.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a6b399089---dilibokabirejutedokiker.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/47913100567.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/681ae77bec1c6e3729d21cb11276b221/biwugujomevo.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_off0000d5c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C1 9928 bytes
SHA-256: 23851b9e929654872a047abb05ecdae1a9c8f5e304f0813b2ad88adf04497743
font_01_sfnt_off0000eb7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7C 18384 bytes
SHA-256: 9c4bb782fd1d7fdb14a80a0d94688efb830127885570d37b17fe887ce45ec7e6
font_02_sfnt_off00011b87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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