Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dcda1fda175d391…

MALICIOUS

PDF

83.1 KB Created: 2021-09-02 01:21:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d86a3a6bc28ce810e90827fb520bc5fc SHA-1: 3adf9f15f264f1be75f9ace7e76a543d9b2f95d9 SHA-256: 0dcda1fda175d391064d55793ae096b4e6035d39b90b67ffd0e5cd2f8c241bf3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is often used to download and execute additional malicious payloads. The presence of multiple external links, some pointing to compromised WordPress uploads, further indicates a phishing or malware distribution attempt. ClamAV detection as 'Pdf.Phishing.Trojan' strongly supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160e904780a7e8---88635823997.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ab186ce6c---lejavat.pdf
    • https://anthonygillant.com/userfiles/file/75966566086.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4648eab0f---39880125608.pdf
    • http://kapsalonvogue.nl/files/file/vugoronubipoxezunulegof.pdf
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/6eff8f36a8ff3a29da488021fcd46504/20061032955.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a780b59b08---dosopagutop.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b2912cb89f6---12085188524.pdf
    • https://xylemleads.com/userfiles/file/zamikig.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b292088b0ac---19293237694.pdf
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/056f74nns3j4g1j4n8btpbeahr/49824109836.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be0db3b54e6---31924956898.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c53f08ecc14---rogojefarudixuretiwineje.pdf
    • http://olynskiconstruction.com/pics/file/29249803226.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/1a767d5f4276a58bb7ce25c639c54044/73421743142.pdf
    • http://banghetretunhien.com/media/ftp/file/85917502092.pdf
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/8129002444ede47451d9215d0b359dac/vagivobotagugisuzodaxetir.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/77fa0b92ef6c88926da0e551a76f2599/28672861580.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16127513482df4---71655740851.pdf
    • http://alburigiott.it/userfiles/files/sifamipiwek.pdf
    • http://olympicburger1988.com/uploads/files/35825936352.pdf
    • https://cgeminfos.ma/upload/file/96769144002.pdf
    • https://www.theoakshealthcare.com/my_content/js/ckfinder/userfiles/files/49161964846.pdf
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/t1936q6abovllqqf7k9p1crud9/rowesuluvezonokoju.pdf
    • https://posaonakosovu.com/ckfinder/userfiles/files/libukividuxuborema.pdf
    • https://booknowrentalimo.ch/userfiles/files/zibomexifusaw.pdf
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/e8e8b996f3fc8384a6fd4fb676315239/dutovefo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=resume+format+for+freshers+in+aviation+industry+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8dc.bin
89792e5565c4989841a67749ab53220b4c2fadd3f4d557b426f7841999831aa3
pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DC 20048 bytes
font_01_sfnt_off00010bf5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF5 16792 bytes
font_02_sfnt_off0001240c.bin
14bbf8bc2093be06d29e716748924df76691d8d366df3134d006fb6625b7a913
pdf-font-stream PDF embedded font (sfnt) at offset 0x1240C 11040 bytes