Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d5d0cb037de470c…

MALICIOUS

PDF

80.5 KB Created: 2021-09-19 09:58:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1443823118768bbc2ecc543b36c35036 SHA-1: 9498d8d9e642728bfca3003ef8417134ad9dd344 SHA-256: 3d5d0cb037de470c3c1a681ae58dc01deb7d9a8bec62d82bb9dd04861010c8a8
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The 'SE_ENABLE_LURE' heuristic indicates the document likely attempts to trick the user into enabling content, a common tactic for malware droppers.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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=como+acceder+a+un+telefono+android+remotamente PDF link annotation
    • http://sfalojistik.com/userfiles/file/97904524463.pdfIn PDF document text
    • http://tottazo.com/userfiles/file/bexogaporifokigaxedefe.pdfIn PDF document text
    • http://gamecoast.by/uploads/files/93136113386.pdfIn PDF document text
    • https://www.willmarareachamber.com/ckfinder/userfiles/files/kewit.pdfIn PDF document text
    • http://czerwoneiczarne.pl/files/file/foporuvo.pdfIn PDF document text
    • https://unosms.us/userfiles/file/94617594160.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/97681992853.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/kesedupudimekanabogexi.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613017f784f15---9927860450.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f846fc8931---vububimusefola.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/91414660887.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/1af560afbdcd52722c238339e564eecb/61440917125.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/189fd10d4bb34f960551aa578685ecfa/95588601261.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/kofesem.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613747b390bc0---vobaxotubomekazamerere.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/2f494c087993aa600e1d9df41f3ee866/sifadajowiwunariwepefa.pdfIn PDF document text
    • https://photojet.bg/userfiles/file/rojurupibimizuzaj.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/koliwofivejuw.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/gisakonebufoxizamaso.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/totadojoginiti.pdfIn PDF document text
    • http://usagimatur.com/files/others/pumosuxolalapepatizezane.pdfIn PDF document text
    • https://edex.co/userfiles/files/zimuzowaxisotaj.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_off0000d45b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD45B 10600 bytes
SHA-256: a9389462ff4b24913ab2f4e48dd60ddc41a545efcf7b05184967e2ae0ca5db25
font_01_sfnt_off0000ec88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001049a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1049A 18184 bytes
SHA-256: 56ae597bd84cef07e793449134fc1347468b850eb6e041aabe4a1c394aa5c5d0

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