Malicious PDF — malware analysis report

Static analysis result for SHA-256 901067d876e4509e…

MALICIOUS

PDF

81.8 KB Created: 2021-08-29 14:23:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: efc43bff6a8cca2ef0d3ed15c50a9e5d SHA-1: c40ccae091ac9dc7e213bdeee5b932897b065b51 SHA-256: 901067d876e4509e5c12305da33088542bd3731c3710eb72ba5a490828554e13
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its true intent but reinforcing the likelihood of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://pixomot.ru/uplcv?utm_term=tricky+game+answers PDF link annotation
    • http://amsasecretariat.fr/userfiles/file/39411892216.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/53508474374.pdfIn PDF document text
    • https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/58784322268.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be611e39ae4---27583237706.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/fonali.pdfIn PDF document text
    • http://smart-ventures.ch/upload/Editor_Images/files/91229909948.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4599a1015---90144374399.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/8dc63190f5ee429efb95addca99d8b23/fijezelepifanopo.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/43999528682.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091091a6c3c7---modijinisemagosukuwig.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/30458566413.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/gesivarunijarazuv.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/42111647710.pdfIn PDF document text
    • http://mhs69indians.com/clients/864804/File/zizev.pdfIn PDF document text
    • http://juha.be/_files/file/zasuwewono.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bef8e799b49---kosoduwibikuba.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ac15abbf3f2---defijubururilezedevowes.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/clc04bq230k6knprabd6mdngi6/pixur.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/dawazap.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/rogowo.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a03c42b1dee---xerikenuwovo.pdfIn PDF document text
    • http://themetamorphoseprogram.com/userfiles/file/80584482292.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/b8cc6915f0138ce149c0435d545ed4a6/magawusegitesulitifil.pdfIn PDF document text
    • http://johnsonsdynastyincfamilyassociation.com/clients/10108/File/saxafefipow.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/643944616.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_off0000dba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA0 17628 bytes
SHA-256: 0c2050e2396b291b851b042ae24aea1195b1ec9c2997b9e01afc89376f195a62
font_01_sfnt_off000108fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12115 10564 bytes
SHA-256: 0935806a6c82ff38158897765df05daf5fd16402835629d02a29788dc4bb497f