Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f203d536643cfe0…

MALICIOUS

PDF

81.6 KB Created: 2021-09-11 22:50:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 05862a6ed268efdb30eec70c8b5e64c9 SHA-1: d8216a3372beb3242c9a28196cf0c6815f59afcd SHA-256: 8f203d536643cfe0923abeb4bbbda322c8ec2c2f7ca55252c6bd7fcf927484ad
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights this behavior, and the presence of a 'download button' lure further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://drafthe.ru/uplcv?utm_term=powerdirector+4k+mod+apk PDF link annotation
    • https://namratalakhotia.com/userfiles/files/pumuninekuxugemulu.pdfIn PDF document text
    • http://sakurahoaanhdao.com/webroot/img/files/rupufazotadufawonesijali.pdfIn PDF document text
    • http://yey.uw52.com/upload/files/besezazarebibapofo.pdfIn PDF document text
    • https://electroagro.es/pub/files/bobodobipofugekelarep.pdfIn PDF document text
    • http://taaltoetsvo.nl/userfiles/file/teniwaxamoza.pdfIn PDF document text
    • http://nhatrangpalace.net/app/webroot/upload/files/20074254323.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/a07e7f5e9d66731d39ba9afecf3ddd4a/31072246690.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/95228450587.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/67815486242.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/21600023891.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/25711393412.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/75017776147.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613624d5d3e9b---vuzizitutunamo.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/80461478559.pdfIn PDF document text
    • http://fgosvo.ru/files/files/96127521259.pdfIn PDF document text
    • https://lockerova.eu/admin/upload/documents/jasilagute.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/fewujexuzugojakasaso.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/62258066784163e2a877a4c068472269/27493146940.pdfIn PDF document text
    • http://qwerty.pl/_data/file/lawev.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/41335557619.pdfIn PDF document text
    • http://liily.jp/upload/file/20210906181226.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/161350ba11afa4---35483962243.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/sapaxamor.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_off0000d783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD783 10616 bytes
SHA-256: 390c4ecf17a8aecf0e510e66bbc230953162225f494439da4bf8015ce3723d79
font_01_sfnt_off0000eff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10804 18672 bytes
SHA-256: a95dac377581db7057656e217c932a7494d65ef92bfd637ffe0f068c4e685f1e

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