Malicious PDF — malware analysis report

Static analysis result for SHA-256 efb173c4fe30c331…

MALICIOUS

PDF

90.4 KB Created: 2021-10-04 23:17:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d5f5d77e2559bfcdd7c8aee30758b0eb SHA-1: c4f33c65b7b9488f5e16746090fa0eb55fcb0e41 SHA-256: efb173c4fe30c331d80376139d678a7591b8de64ee935e1c37e133fc5fae0166
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of 'utm_term' parameters in some URLs indicates a phishing or SEO poisoning attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://huntic.ru/uplcv?utm_term=bitter+melon+nutrition+facts PDF link annotation
    • http://halanmilk.com/upload/files/dobefutaporozoxijudabaf.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/9bac0f76d7ad2cb12c0ade49ebf08c70/20415291707.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/lemaguvekesez.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/genutep.pdfIn PDF document text
    • http://www.agot.pl/upload/file/fuwanojoziwavofeda.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/95140044613.pdfIn PDF document text
    • http://thanhcongtechtra.com/upload/files/15815762583.pdfIn PDF document text
    • http://isvpro.com/custom/files/83142951503.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/tamara.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/xefozamolozivopib.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/69736888900.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/dudetetarodozatepizaza.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614be68fbd09e---guwiwobokusapewusuta.pdfIn PDF document text
    • http://skinct.com/upload_file/file/Fl202109160709042554.pdfIn PDF document text
    • http://twinmd.ru/userfiles/file/gazezunitujesisakos.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/53623716900.pdfIn PDF document text
    • https://inprovitargentina.com/ckfinder/userfiles/files/736703408.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/a258973a1ac06e2c4772b509acd71127/28683074725.pdfIn PDF document text
    • http://sziszolg.hu/editor_up/5682557030.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c28dfd12fb---tugaxuj.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/32622171977.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/kojidefawuregizejabuv.pdfIn PDF document text
    • http://latiendasegura.com/contable_prueba/userfiles/file/10983918920.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/83012122937.pdfIn PDF document text
    • 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_off0000f08f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08F 10652 bytes
SHA-256: 539790155826232e826468c44c09b3d7821755f8cad02a34e2b25763b7d37976
font_01_sfnt_off000108f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F0 23164 bytes
SHA-256: 5a30d770cb0dea22debfb0a53a57cb5d2a7393bec1559513528ab837291c624b
font_02_sfnt_off00014389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14389 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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