Malicious PDF — malware analysis report

Static analysis result for SHA-256 a133ded97b6e9e5e…

MALICIOUS

PDF

89.9 KB Created: 2021-06-13 23:38:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 52fa4e605fc88b138370f233817b235f SHA-1: 3f964485e19fa54ce5cad095c806367bc172635d SHA-256: a133ded97b6e9e5e8ea27d6406a5e593accc7468b5c590e4f0f279f78551c90c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous links to external websites, many of which appear to be compromised WordPress installations used for hosting malicious files. The document body text, though partially corrupted, suggests a lure related to software downloads, aligning with phishing or scam tactics. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pistant.ru/uplcv?utm_term=commandos+behind+enemy+lines+free+download+utorrent PDF link annotation
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/24bc9a2c8c845fccdef9f53735cd914e/vibipudipiwi.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/4823733498.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/75318320447.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/5so3h5ngkc18teor4ri7prmjrh/jubupujivekibixogepodi.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9eaed91cc0---kugepijewatikasosetomap.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/kvocin469he441u7ee2n7moo3c/51096869745.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fdd1ad2918---kokapusedopewulaw.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16075d23fcf80a---2653040991.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5106ce9ca---bunuxo.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/ie07vme8vjct6vev34relg3k4m/84486637350.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/tj5a4v5rue25km48meurb2vc1p/kariri.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160781d2ac1dbf---21026169792.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/834e8b46bd6c614232325fd0473dd7b5/47041432137.pdfIn PDF document text
    • https://sce.tw/uploads/files/60bfbc22e2e2f.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/38628931845.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad8f47ebe8---rewug.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/u7e96svqa90l24gkofrvpk2420/sajubatipunosobutupo.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a495d9279b2---46381415621.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011c55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C55 5388 bytes
SHA-256: ed88769e19137a62a1ef3e08178873bf1f7f08b084019a9617affc3bd2cb64ee
font_01_sfnt_off00012e88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E88 13488 bytes
SHA-256: 07adf0c8efa32d6c08537317000280a57d033738b188b8042900dbdd8a9a3459