Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f85223274d9cf78…

MALICIOUS

PDF

78.7 KB Created: 2021-10-05 15:50:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: bbc98215d079d4d3e29cb0cd34ac119d SHA-1: a33014afcd23044e7db2a6144e7a6265b1adf430 SHA-256: 9f85223274d9cf784033cc7f5d1dae1f32137d362eda6ea5ffde517524300df4
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://pixomot.ru/uplcv?utm_term=manners+normative+power+europe PDF link annotation
    • http://buyyoutubesubscribers.com/ci/userfiles/files/xovalisobuf.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/161522b644f7b0---xabuduto.pdfIn PDF document text
    • http://tlumacz-bialystok.pl/pliki/file/19633094572.pdfIn PDF document text
    • https://letajicikoberce.cz/userfiles/file/vudapefegosenugepexupa.pdfIn PDF document text
    • http://kajo-frings.de/userfiles/file/39440051036.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1615bd07a781fe---60269961138.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/82993146480.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161458499df617---lozatotevugeri.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/15224049780.pdfIn PDF document text
    • https://suksesunited.com/contents/files/dapivale.pdfIn PDF document text
    • http://zssadkowice.pl/pliki/15525137474.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161588d32db8a7---9502435308.pdfIn PDF document text
    • https://volandovia.it/public/fileeditor/file/wejefaximujesikugito.pdfIn PDF document text
    • http://gartenmessebau.de/uploads/files/lejutugitenopenivasewad.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed7898c45d---40522820552.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/69561010563.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/vuxemibuge.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/31446408295.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/94e9c5615f205d0a06eafe565ec3d053/19321873376.pdfIn PDF document text
    • https://tttinox.com/upload/userfiles/files/9354458561.pdfIn PDF document text
    • http://szwygs.com/upload/9788534060.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1615b26940d59f---bisusakevesiwivi.pdfIn PDF document text
    • http://hybsch.it/upload/file/1505482823.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/wuxajodifugosib.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/kowisoki.pdfIn PDF document text
    • http://ingpoggi.eu/userfiles/files/dusofuwukagib.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_off0000cca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA2 18724 bytes
SHA-256: 9f89d46f7e46ca19844043e0b89ee9e5b8c51b91e095d4c70e54ad0a0f2b9a9b
font_01_sfnt_off0000fc59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11470 10612 bytes
SHA-256: b3f9cde513561180ffaa5fca2c9b4e41d4a0259ab46b17c37755a499db4fab4e