Malicious PDF — malware analysis report

Static analysis result for SHA-256 20872732666359bf…

MALICIOUS

PDF

90.3 KB Created: 2021-08-01 13:50:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: da530dd093c1d6a3e3b279b6394af9b0 SHA-1: 2f90a8f39e38a1f6ea99c3dc2696a100c3e62524 SHA-256: 20872732666359bf7e7ed7db8b40237e59f414095a9b62ab8a9c1cbf079cf2da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised WordPress installations. The presence of these links suggests an intent to redirect users to malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://cructi.ru/uplcv?utm_term=fnaf+2+mod+apk+latest+version PDF link annotation
    • https://dm288.rs/slicice/file/71485646588.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/zilomovuxawivagijasozitun.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/7340a2ac015a76ec7f76b988e70109d7/80265269744.pdfIn PDF document text
    • https://egca.fr/userfiles/file/rubotureronusagaxakake.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/c89368f1ce40c8c712fe4357eb9b0b12/wowapijag.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/tunej.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/likafejogat.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/0c6c188199a1b5211b6673b6bb0aa92b/kemunapowegiwosutesilup.pdfIn PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/padakumepapuradisalakaj.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbc59f17d3---zogaxate.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/33g24rpcm8v2ga73obksqm2qb5/95081524205.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/b225234a51fb0917ae999cc47ad94cd2/35877014012.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16087dd5c1878b---pubojinirav.pdfIn PDF document text
    • http://amandamaitland.com/images/file/xeras.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/a433c7c20ff80d240b41af69d24bcc35/bafani.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ceb118115b1---soletabuduwujifo.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/1uqr16pc8d43162nh5a9ntntrg/foxidigiwividefuvipotezez.pdfIn PDF document text
    • http://partnercable.hu/files/98522565227.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/320oq20bvhj7g2ifnaqoq2crl4/60354017925.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/nejenumibubagavuradur.pdfIn PDF document text
    • http://allg-gyn.ch/userfiles/file/78962534235.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///zikonugikujivupujusapofip.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/29b70e0377d82cb461edecfd194a0801/26603026123.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4b84e3b964---mareluti.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_off0000f682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF682 10912 bytes
SHA-256: 93c9f1d02c838bd96577e34b356f068d3c648b9c37aaa669e62fa80ca2ab35b8
font_01_sfnt_off00010fc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC9 19580 bytes
SHA-256: e302682247481556c7b221f71e18510a34cbc21d224916a1935ae9a450c87b63
font_02_sfnt_off0001433d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1433D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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