Malicious PDF — malware analysis report

Static analysis result for SHA-256 a58cb17872c3663b…

MALICIOUS

PDF

60.3 KB Created: 2021-06-24 08:51:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: b6f6ec2f69da216505226a32c35f1a17 SHA-1: 3b9c7f5d02b76b0f4ce88a786aee70aed64d2702 SHA-256: a58cb17872c3663b696280d54dfd3b58c36118aeb3f99ff3c0c5fdc6829e4468
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to potentially compromised websites, suggesting it is part of a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to a 'Zetor 7245 workshop manual'. No scripts were extracted, but the presence of multiple external links indicates an attempt to lead the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 http://cityhigh78.com/clients/2/2d/2ddbae4fb74c169819b3574d76e4e264/File/juzevedubigujaj.pdf In PDF document text
    • http://dolphinegypt.net/userfiles/file/rusopovuji.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/kegotefikonujulurogapax.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160aad8dc21d15---bejoputafumimuxorofoxid.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/b5b6qdof70htmq25hpv0bqskp5/tujodufozokopekusa.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a26a45371a1---zezofetit.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/hvpmldhfrvkudgeq90b1ftef58/92564241339.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/8764612894.pdfIn PDF document text
    • http://araonline.hu/uploads/file/dadinaz.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/1af74c2bd039453f9059e3c1883159eb/nisizedatuvusi.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/vogudisunurad.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/3d3abcda320db24db6256a8d36c9e033/5582680866.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/8e8313dc294267eed4ae1aeb0c4adfd1/pabunizazewu.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/76259700ad866b0a34f057838209de39/88372881145.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/112faff96146882a795056c825561855/79793969205.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=zetor+7245+workshop+manualPDF link annotation
    • 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_off0000af06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF06 5596 bytes
SHA-256: 0a3ed9fe9164d57f9d8f4f20b1293143ac2fc3d1435fa02f7a40fbaa19318ed5
font_01_sfnt_off0000c209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC209 10120 bytes
SHA-256: f6d324c078a07b9ae637589528caef650efd5adab7ce29f50f72fc202e45662d