Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d042315a2c5ed15…

MALICIOUS

PDF

79.4 KB Created: 2021-09-13 02:00:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 46bf9d6f0d5426cf06ea2d48fd6f5846 SHA-1: 5cee41b2dd6a8c375b1236f1d41c71e80f632c92 SHA-256: 3d042315a2c5ed156d0f6e2cfdbe94122446de6dfcbc96f2f210f91110d0a1af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://huntic.ru/uplcv?utm_term=apk+puzzle+bobble PDF link annotation
    • http://etpatatietpatata.com/userfiles/files/15249179957.pdfIn PDF document text
    • https://digireg.si/upload/tujasapiwepizolame.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/betipapepemegome.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/xoroz.pdfIn PDF document text
    • https://skykharchono.mn/editor/files/47643098738.pdfIn PDF document text
    • https://7mark3t2-7aya.com/contents/files/9896655646.pdfIn PDF document text
    • http://www.focitabor.hu/userfiles/file/gofuk.pdfIn PDF document text
    • https://nepalonlineexam.tisaracademy.com/userfiles/files/fibawasiwosoxonija.pdfIn PDF document text
    • http://energcomb.net/cms_enercomb/sgi_userfiles/userfiles/files/mevofukabeg.pdfIn PDF document text
    • https://mcsfood.com/images/file/97280673524.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/liwoza.pdfIn PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/95768178978.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/womadekevuvazoguxaj.pdfIn PDF document text
    • http://jumpstart.mobi/ckfinder/userfiles/files/39764736782.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16135908db4f91---12394075074.pdfIn PDF document text
    • http://mrtowing.ca/Lawyers/userfiles/file/monutimaborosaxexut.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332b219264d---kizexinabap.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/80197692608.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/rucr44hs51qdb906sl36v250s4/35427957301.pdfIn PDF document text
    • https://bliznacite.dvsportbg.com/files/21318412858.pdfIn PDF document text
    • https://buddhaart.in/userfiles/file/jixekelanuzelisaki.pdfIn PDF document text
    • https://webrekruit.com/php_codes/Scott/VieauAssociates/code/userfiles/file/93877302250.pdfIn PDF document text
    • https://epiphanych.com/images/file/tutawinag.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_off0000d2cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2CF 18340 bytes
SHA-256: 18e96ff1110b9ae971ce9d4a55f59fddac82c6dad83a988f51a05bec71f90214
font_01_sfnt_off00010281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10281 9892 bytes
SHA-256: d987e39e0895eafa75b00538f5b7d0fb80987d33cf0ef77cb9ac5cf4ab7e87ec
font_02_sfnt_off00011840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11840 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1