Malicious PDF — malware analysis report

Static analysis result for SHA-256 25e459dab559ab98…

MALICIOUS

PDF

88.2 KB Created: 2021-08-17 22:12:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 092f3a05504a1d0f34d1cf61181b63a4 SHA-1: e56cc8221fe3e6cd6d86ab1c7e519059e8e30041 SHA-256: 25e459dab559ab98ea40d0159a92680e8332af5f84bb55fd8a4956602037c799
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO abuse. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://www.eos.org.eg/ckfinder/userfiles/files/nijefulovoraruv.pdf In PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160c431f287bdc---nukitixoputotemowozux.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/defojube.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c6294e899---60420892296.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/sawubalazew.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/36725852732.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d7610afbb---bizujakujax.pdfIn PDF document text
    • http://farashimirooz.com/files/besugujoniju.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/v31g55ko5av7v1mnbo8vrsoj53/raduvisodime.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/vvgbpph1buhh7bvk4v8spsn352/fuvedazemofutenisulopepem.pdfIn PDF document text
    • http://srlamn.com/clients/0/00/00e84243199fd86ca7c15d66a0237eb0/File/10612448194.pdfIn PDF document text
    • https://ezgoe.com/10005001208290177/ckfinder/userfiles/files/nuwofepiruxuxakupubo.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fe93900b6---suxinibonuxuxi.pdfIn PDF document text
    • http://gerocuki.hu/user/file/81146680856.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf5bcce1ad---garobonelelinawexo.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b80eaa7075---nesebijotemewekuginotagu.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/46037541774.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/59426954009.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/sf7s1mh9o6ofmarqnq854migqr/43923188517.pdfIn PDF document text
    • https://tsolisp.com/files/file/tizonujujas.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/pifagirepa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=combinaciones+con+repeticion+y+sin+repeticion+ejercicios+resueltosPDF 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_off0000eea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA8 18548 bytes
SHA-256: bbf7c8b5896b70760f8aa8753e66c84be2968ac637f2eb1a8d52f717718197b7
font_01_sfnt_off00011dd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD0 11048 bytes
SHA-256: 5cf57019e2d4fc880b49578105ea4f1861eab5aa77e58c63bc52cfeabd0dae12
font_02_sfnt_off00013751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13751 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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