Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9c60911b214c7b9…

MALICIOUS

PDF

111.5 KB Created: 2021-07-02 09:42:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: e131b3d095a64e0ff09fad6bebd39595 SHA-1: 5b416ff92c09e5ca90f1f531b9021cb3dc816c7d SHA-256: d9c60911b214c7b9b7d35bdbdf467ccd5f068c800ccf77f6a79fa170e87f6b69
164 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to host or redirect to malicious content. The presence of a 'download button' heuristic further supports a lure-based attack. ClamAV detection and ML classification strongly indicate malicious intent, likely to deliver a second-stage payload via one of the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • 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://cructi.ru/uplcv?utm_term=well+known+libertarians PDF link annotation
    • http://rauvuonsach.net/images/uploads/files/ruvedok.pdfIn PDF document text
    • http://sushibelovo.ru/files/19584939162.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/df3jk77sj8uqeuel6gk1g4al9h/75170728448.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/9e85b55feca07c3f5c7dcfee092d61ee/56973580956.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/88001269376.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16076b1fc600e7---85455391639.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a25983d667---wised.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/cb09866192de952b8c3e9879fc4fd5a8/mamijivuzikipakirim.pdfIn PDF document text
    • https://campermagazine.tv/public/file/28753911982.pdfIn PDF document text
    • https://synersys.fr/contenu/file/14060894747.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/4414b1fd1e2b4f3af36db2fcf52fceb8/50600832641.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/7776841959.pdfIn PDF document text
    • http://saokienviet.com/uploads/image/files/jexaxokizamitaki.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd63251c1f---49768000858.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/4h5ao40bmlnmor0msgep1gbsl1/redukenadajo.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/fb48f0f0d17d5c358862425a1d861361/gezabubigufogudonijuno.pdfIn PDF document text
    • http://adveotec.com/img/file/3770643153.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0e9603a9a---36623589187.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/35881253904.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e921a1e2c---rilijaparojiwodapirejub.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/wolexapelefoto.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000153b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153B4 17428 bytes
SHA-256: 5cdedc8369b7235b871508aad1f701068ab899e53434a7a5535eb51c4157eb66
font_01_sfnt_off00018154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18154 10412 bytes
SHA-256: 494fdeecd97d406775e0b55bb90948477e0cc4c3c62a55e642fb49f11009a649
font_02_sfnt_off0001991e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1991E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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