Malicious PDF — malware analysis report

Static analysis result for SHA-256 80cf13b462878555…

MALICIOUS

PDF

97.7 KB Created: 2021-09-23 02:24:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 179ebab9509b3c4a030504d31db05bc6 SHA-1: 4ae81446ee5128aacc81d78b93c5a9a2b241431a SHA-256: 80cf13b4628785559a3bd659f6d0f2157790cd1dd3df308d446a15d45c7feb5a
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zafirkort.com/uploads/files/80887290749.pdf In PDF document text
    • http://nguyenxuanhuong.com/upload/files/jiwisuge.pdfIn PDF document text
    • http://magdrywall.com/project-new/christianbook/upload_images/file/18505298124.pdfIn PDF document text
    • http://dalaichau.com/files/lutivoma.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e291f32be9---gevewuxirate.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1614750220fafe---namazitolezudojotimug.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/nezafiregakozixuno.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/71406227267.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/446e746d341ac4cfdd0bd17c99df807c/laxutafudegokomaxolod.pdfIn PDF document text
    • http://kutyasturak.hu/images/files/61410978963.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/309ff6f7e9fb7b25acac2b1c131d8527/zunegujujen.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210909092743.pdfIn PDF document text
    • http://pk.mo/userfiles/file/zenitepekerozu.pdfIn PDF document text
    • http://vanlysecurity.vn/vanly/album/files/25041108237.pdfIn PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/kuxefabopitawe.pdfIn PDF document text
    • http://simonide.org/userfiles/file/84533046228.pdfIn PDF document text
    • http://millionsdiscount.com/mo_images/files/zesobepezafat.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/50688409281.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161368989c4bc4---jogixesokega.pdfIn PDF document text
    • http://mrybalko.ru/files/tamawuzegenokuwawez.pdfIn PDF document text
    • https://eminentland.com/admin/userfiles/files/mixodumilexadurinawer.pdfIn PDF document text
    • https://777mto.com/contents/files/99071661529.pdfIn PDF document text
    • http://wjcopy.com/upload/files/renemumujanawotizanabimu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=pmd+super+mystery+dungeonPDF 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://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_off000114e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E6 10648 bytes
SHA-256: eea3b55b37399ca952d3640fb2ca006f2ddb618c81385a132a09a1bd6ef8dbda
font_01_sfnt_off00012d17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D17 19936 bytes
SHA-256: 45116069cb31bb8e06fd7cf62e20f5b08ed35739769d6d31bb8a382d2ecfb200
font_02_sfnt_off000160d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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