Malicious PDF — malware analysis report

Static analysis result for SHA-256 2383e452f8f9ac77…

MALICIOUS

PDF

80.0 KB Created: 2021-09-03 09:08:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f8334647c2766db2037c7d424e0fcb61 SHA-1: 08807040861848f98f6b5ba828a4126797e30e33 SHA-256: 2383e452f8f9ac775314770ffd12fe5b411fd5f89d3fa6620a235e17f4f38d47
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users into clicking malicious links, often associated with spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://archism.ru/uplcv?utm_term=lego+mindstorms+ev3+discovery+book+pdf+free
    • http://www.sana-anong.com/ckeditor/ckfinder/userfiles2/files/90543841030.pdf
    • http://reutlinger.pl/userfiles/file/wixilesifameguwotal.pdf
    • https://martensmgt.com/business_school/uploads/file/kutotom.pdf
    • http://www.niceresidence.net/image/upload/File/gululukaxamumalisexotuv.pdf
    • http://permianhighschool1970.com/clients/e/ef/efee9fcbc667252fc4b649c8163d3733/File/kelaferalig.pdf
    • https://binarbaidservices.com/public_html/userfiles/file/14311242518.pdf
    • https://kheops-so.fr/ckfinder/userfiles/files/tanorowirarumuvim.pdf
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/7f2cea9fc622541e5b3fc4fce5a22b2b/82918656303.pdf
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/2d0f33b7b66ac617ea15939fcb44371b/jumamopajiwokanozomikup.pdf
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/70062807113.pdf
    • https://mycocoa.org/images/upload/files/jigolafemunatuvasu.pdf
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/44f021b2e5ebfcc516d32a511823dd6e/pesodajezejirax.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160856b0099c22---natuxunaliwufilupe.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c0896a658---wataxuxonotoxujikedakasu.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16070f5f13be97---lowosobekexiviwoxa.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741c4a953c3---4596151096.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/5d9162548ff869831aaae59d59038299/83176006776.pdf
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/runonegetiju.pdf
    • https://jagamimpi.com/contents//files/46677336959.pdf
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607eeae90cd7b---42846946710.pdf
    • http://camel-republic.com/media/userfiles/files/luniwaxoverafosu.pdf
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/d0708b584f194f14fcab106b5c79dd8f/linizitinimarudexetexuser.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cede.bin
3edbeeed2824bb04ed4fa1b4ea2ee15d7cfb1223b408cff99b429a4b79123c31
pdf-font-stream PDF embedded font (sfnt) at offset 0xCEDE 11296 bytes
font_01_sfnt_off0000e90e.bin
ec39fca71a11dbdad0688196e0554bf99d6f12fad4937c7e4999f04520b4e5e2
pdf-font-stream PDF embedded font (sfnt) at offset 0xE90E 18624 bytes
font_02_sfnt_off000119e6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x119E6 16792 bytes