Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f2e17d0c140a9e0…

MALICIOUS

PDF

83.0 KB Created: 2021-09-02 19:07:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9fa41eec00c4379ed36a1993659842e6 SHA-1: 9bf6b43e96b01164ddc394d6cd8856c11d93c533 SHA-256: 8f2e17d0c140a9e039454101cf84dc06a0e8aa108a0d9c05f88b8d4a9d026f5c
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or are hosted on disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://medica-eg.com/userfiles/file/94935900312.pdf In PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/4mkedtdgmktfb4buagjbs45057/rozenefifawunu.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed9e209b1c8---87225175788.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a25785dec3d---66847758271.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1607035017f04c---90898919327.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/bosanumatalup.pdfIn PDF document text
    • https://gilbertems.com/videos/file/fupipafiwala.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/20625586686.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/a0ac40be3f17ec9cd3488258507915cc/87251823409.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/fdp34afc2t9acm64jon7ohcra4/70047260895.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/vupirixipaxazimuz.pdfIn PDF document text
    • http://lindendirect.com/tempimg/file/lefifed.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160ad67cb7b0b4---rofidezib.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/badomabidusabubu.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/53284594876.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/zodugoxapoladetelejen.pdfIn PDF document text
    • http://cunningham-reunion.com/clients/7/73/7399477c88ef979e1ad3ac38e42cffcc/File/87058179251.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/wamakovojopaf.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/13e9bc8263da8a2b0da9b6b58284508c/zolosadefobigipolosu.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/d6581b60f14a620422104a6bcaf70a91/jitobik.pdfIn PDF document text
    • http://reichspfarrer.sk/file/97298005618.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088ebecd1ec4---32687072226.pdfIn PDF document text
    • https://xcheck.vn/uploads/userfiles/file/43382376860.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/sazopisuwozexedevovukev.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/4e54be9e1f659efc197e31a5bda9fde5/72288467311.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=idealism+and+realism+philosophy+of+education+pdfPDF 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_off0000de1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF634 11052 bytes
SHA-256: cc7dfa9438589c3ccf7955b3e9d3b1a51fdc6a9cdcd6c529e237fc1f401949ac
font_02_sfnt_off00010fb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB1 17884 bytes
SHA-256: 5ca178066f652e93492d09ad49666cbdf2c8365f3ee9c337c6b501a565167ab8