Malicious PDF — malware analysis report

Static analysis result for SHA-256 db9971599745d74a…

MALICIOUS

PDF

82.7 KB Created: 2021-09-18 23:55:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e3df1947e4a6276e1713abf6574bf820 SHA-1: 6a3c344d2869a33e720a9726be2900993b1a2418 SHA-256: db9971599745d74aa8e3e8d2dda3f1289de27099f1be382bf12d9e1470109cce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • 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.
  • 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://ketchas.ru/uplcv?utm_term=where+is+my+clipboard+on+my+tablet PDF link annotation
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/8959679639.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b914c89e1b---1626640680.pdfIn PDF document text
    • https://investir-petroleo.pt/ckfinder/userfiles/files/porar.pdfIn PDF document text
    • http://www.zdravotechnika.com/ckfinder/userfiles/files/liporezuse.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/foxikexepedifonituxijuf.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/22205009057.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/23192088455.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/sovijevelilur.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcb2d721e2---17267418992.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/xamunuzomapide.pdfIn PDF document text
    • https://proxus.nl/file/revavabenolojafodelabob.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/vivipojim.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/memugugajumosif.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/viwodud.pdfIn PDF document text
    • http://hasicimosnov.cz/foto/Image/file/linimaboras.pdfIn PDF document text
    • http://tochalco.com/uploads/files/norivunolujelonozosafopo.pdfIn PDF document text
    • http://ziva-muzika.cz/files/file/18584553998.pdfIn PDF document text
    • https://ribaczpeter.hu/files/file/degokidugolisuzipisotu.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/tuwutizawodotepepefebifa.pdfIn PDF document text
    • http://ssatripoli.org/userfiles/file/rujobo.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/vakidusabadabaw.pdfIn PDF document text
    • https://proartgaleria.hu/files/files/69375335342.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents/files/zutem.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/19168695078.pdfIn PDF document text
    • https://kamhosting.nl/ckfinder/userfiles/files/60724141193.pdfIn PDF document text
    • https://afayl.com/userfiles/file/lagumagelodexewizudu.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161426a80cdd66---fopezopirekodaf.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_off0000df3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3B 17312 bytes
SHA-256: ef1a1d00f2554f0b4b9c51f4915bb96c6c17a78081d3b1b9c6bcf6f0efbd3b6e
font_01_sfnt_off00010bfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12415 11024 bytes
SHA-256: 0661ae45b013cb672eb4a66225ce29d0f720956899e54ccaf5644f86ee67947a

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