Malicious PDF — malware analysis report

Static analysis result for SHA-256 296a9180cbb075d4…

MALICIOUS

PDF

74.4 KB Created: 2021-09-13 09:01:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 35dc4bfa170bab067a1f3f2f60bd9032 SHA-1: e2c86a13695c0bb20968eb12772faad01051f35e SHA-256: 296a9180cbb075d43bdd001a9fd0b58cb2364565b03105c4dae7b934f6f3a195
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is flagged as malicious by multiple heuristics and a machine learning classifier, indicating a phishing or trojan delivery attempt. The presence of numerous external URIs, many hosted on compromised WordPress sites or disposable domains, suggests a link farm designed to redirect users to malicious content. The 'Password-protected archive handoff' heuristic indicates the document likely contains instructions to open a password-protected file, a common tactic to evade gateway security scanning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://infrive.ru/uplcv?utm_term=vce+to+pdf+download PDF link annotation
    • http://accessprecision.com/userfiles/file/72217185882.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/15417496654.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/cad324ad4ffb26f774a2fc2fb6e27219/25429468502.pdfIn PDF document text
    • http://newworldss.com/uploads/file/58084962671.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/370b4c8f63361f4a2e8c0fbb8e84ee99/83574370001.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139594586803---kakepafolebov.pdfIn PDF document text
    • http://exteractif.fr/pictures/2/bamagisutatumenadaxujege.pdfIn PDF document text
    • http://stepasidemedical.ie/images/uploads/file/86973044862.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/xukunew.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/ponuronegedo.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/14953377637.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/tasuj.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/jojowebimunit.pdfIn PDF document text
    • http://hasyo.net/files/file/45523235928.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/2bc767f956341f8ba20382ed8ebb68da/90153167954.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/fatur.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/mimaxerejonapavanalusufe.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/39144606152.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130dafdace8f---luzarajebulisulimejema.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/jafipili.pdfIn PDF document text
    • http://bptramptour.pl/files/file/26664283706.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133ddb092e36---77188469897.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_off0000be73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD685 17792 bytes
SHA-256: 05d997ac3d7b27fe1a634bf55a1284f34e2e15d9876708d2eecdde898076b5f2
font_02_sfnt_off000104d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D1 10308 bytes
SHA-256: 4f8d2cc44d0eea476283d0f7bad92324d64786fe3e3ea900c3bead1629a339ee

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