Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d91f5a8dc20d04f…

MALICIOUS

PDF

73.1 KB Created: 2021-06-23 18:35:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 73b944e5ecfd43eaeb142f87413e10e2 SHA-1: 3358266262aeed9867f6e946411eea9f21da07f5 SHA-256: 8d91f5a8dc20d04fa536261e946c02d50291b3d43e579abb31e7d671f79a311c
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm hosted on compromised WordPress sites, with numerous URLs pointing to PDF files. While no scripts were explicitly extracted, the nature of the link farm suggests it is designed to lead users to malicious or phishing content, likely as part of a spearphishing campaign.

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 http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16079998ec205b---gutomokijokedeziju.pdf In PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/ec649c6aba29a778d3fb7b1b508592d4/gazegenixisojujudu.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/5ec1cf455c7c389cc47f3cdd708ef3d9/52762599699.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/mimususotonezasabiruma.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160a918fea1b8b---68726868419.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/613d4e178548248dce260f3ae40bc046/29511908345.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/80662360270.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d81856c92---betogojomegakekiledu.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbe19a3f78---60592244511.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b5454c52b---nabesidonubojibamazuma.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/388c6bc2512d65d704ef28d88e6244a6/risokudinavevatol.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/26095798312.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/c3c7c7b72e931b9e18cb6234cb8a6178/43483416629.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/c2654dede73f8eaa81d5c2a613720215/7470943239.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/45a4733a5c13dbedbd00a18056a93b4c/28300060920.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/be9961fbdf45f4023cb7e37ec89dd43f/rurunozafipinireg.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/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=tenzi+ya+rohoPDF 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
    • 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_off0000c9ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9AE 4664 bytes
SHA-256: 40a4199d4256b6412f0000351c083ed2542dc6e0a915c58ad909ba177819dfa3
font_01_sfnt_off0000d991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD991 10440 bytes
SHA-256: dd407ccb07a66177ec1472325060fb2c9f7b24559289b1787f32b00d347f69fc
font_02_sfnt_off0000fd75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD75 17112 bytes
SHA-256: 2699f2ce65472362c7cce2649b9a1ca315f2f35cd4c84f2de76f8c9cc61a5f56

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