Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3b2dff285facf31…

MALICIOUS

PDF

80.7 KB Created: 2021-08-27 00:08:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 251f1d7f769e55f22333ad0ca437aa5a SHA-1: 421eba12b26df6444a173e68abd766244c91fca7 SHA-256: a3b2dff285facf31a0b637d930a4e16b9f280a068dd6755a20d407cb08c0e56d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, with many distinct hosts pointing to compromised CMS uploads. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The embedded URLs suggest a tactic of directing users to potentially malicious content hosted on compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/22f10dbac437e97c1195850bc74f99f5/76189187722.pdf In PDF document text
    • https://tkquiz.com/userfiles/file/40436808382.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/824110166.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/duvetamiwivi.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/d98c30e3a1fefee1ab525bd9768f31d1/faruxamotigefebanazikefe.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/0qvrq2clgiagag28hc9100q9e4/nononozasajupavan.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/9ej7mme1soj7eror6ko8v07jid/nanatazaxekokesubisukeza.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d65e5466d79---17036379421.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/fc57ece96d5a387f7135f01dd1f6246b/87404796677.pdfIn PDF document text
    • https://eberli-medical-supply.ch/upload/file/vinafipesezol.pdfIn PDF document text
    • http://dhs1970.com/clients/9/98/98bceae81adeaace0f0761aa7b0d12fa/File/83318851266.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/31072793212.pdfIn PDF document text
    • http://novehorizonty.sk/userfiles/file/wafagesekesubigap.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/76289989257.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ejh6l3pq3hn6l3kn3f5t0upike/87009806075.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f11be0f50---gutimujo.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/zenipimuzejuda.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/skvejmntpp2gno52gf1h5ndqt2/kibawetefefovuri.pdfIn PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/xakewiwevilop.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/54913279880.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160a2816f49fd1---30981557086.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/95437342035.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/lefevajefif.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/polewofon.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5ec5c81d9---69729680029.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5e90930a6---29003766810.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=lesson+8+skills+practice+factor+linear+expressionsPDF 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_off0000d8ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FF 16476 bytes
SHA-256: 07b94e4cb5df373699a0a90e333785b5fb1950798d398767377d2dcf833ff012
font_02_sfnt_off00011bad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BAD 10832 bytes
SHA-256: 8723ef6f55641c3b27aa413b3c92138fb18ddd2e23b362a21380c6fc2f3d1e9a

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