Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4b3e71cf649299a…

MALICIOUS

PDF

99.9 KB Created: 2021-09-01 11:04:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 944ac9ce50bac257b6bdcf1bc1a90fe1 SHA-1: 8731fdf89bbe6c944223c2ad8adb7b1e3f336043 SHA-256: f4b3e71cf649299a7c860e0893f47216b789b002a465741b74f1450de692213c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which appear to be compromised or disposable hosting. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document may be instructing the user to open a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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
  • 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://nomylo.ru/uplcv?utm_term=christmas+in+camelot+pdf PDF link annotation
    • https://daks-96.com/f/uploads/files/jisemafuzipejulefofofoma.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/27130941440.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/rurezurisorisaj.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16091f42e31c1f---jurififazolatopuwepukedar.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/32147033903.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/e2697157d22315cd05a753968f664895/bugemotan.pdfIn PDF document text
    • https://madopin.com/calisma2/files/uploads/diloxopolokevewaw.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/3ed8ffda6c20583bea67adfefe16580e/98647882534.pdfIn PDF document text
    • https://fibra-optica.ro/ckfinder/userfiles/files/78664914754.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/a988578dd0ca08c8a84c4091f798564a/tobajusapafanujasedunod.pdfIn PDF document text
    • http://www.kilincsweb.hu/fileok/file/6570173581.pdfIn PDF document text
    • http://berkeleyhigh64.com/clients/9/99/99a482d4bd0dc5522cc24ea7f8204a07/File/sosiniguk.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/be9bca38bd8be1cd7f032f6ff11ad4bc/modak.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/xujimedaxi.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ac180c48f---fuvijelujisamapaz.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/6853841340.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210713204414.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/48309946530.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ca24e6d10---pikinojebusajupiworupixa.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/3a14bdb6ef967e8f835bd4fe330b928e/dokenirukufarubogibid.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/4ff2348d51fe2ee14bf8c51eb9591124/33485998853.pdfIn PDF document text
    • http://ekbdrive.ru/ckfinder/userfiles/files/jajusemawu.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160928ed9134bd---kafuwukuvipal.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/2fba2b12b9bd103554211dfe34a725bf/41570798883.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011f40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F40 10916 bytes
SHA-256: 70b71f2fe983d10ebb5f2f708dd3c642050d630004a245c7c50184842d675a9d
font_01_sfnt_off00013857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13857 18516 bytes
SHA-256: 35eab9aa6c30920e45f71fb57b1721039a1ab059460aaa802f25c9ec6c79d911
font_02_sfnt_off000169a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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