Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cbf2483279c3617…

MALICIOUS

PDF

85.7 KB Created: 2021-09-05 21:33:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 28e153289736c67b5010a9dc76de1bd4 SHA-1: fde2eb62d1c6f0044f96efbf7ec1fadf84ee3721 SHA-256: 2cbf2483279c3617a75e147c9dc4dc72e6c36b6099e5fb84b52105a0641edaef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF 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. The presence of multiple external URIs and link farm heuristics supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://philabc.ru/uplcv?utm_term=picador+de+frutas+y+verduras+manual PDF link annotation
    • http://www.pranabkumar.com/fckimages/file/67534655214.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4f06debe9---bodetirewunukuxovu.pdfIn PDF document text
    • http://investgeorgia.ge/userfiles/file/bimegewuvuzewifoji.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/pemotowijupokilit.pdfIn PDF document text
    • http://waltwhitman1964grads.com/clients/6/6c/6c9ae932573016e5ff31759a10dce4b4/File/sonirunew.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d36c4cc4812---wurid.pdfIn PDF document text
    • http://underbutter.cz/download/foto/masunujevabezepumijobupol.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/36569157032.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/vujakoboreroxowijipareja.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607557c8b3e38---gugusidivuzutevulipik.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/e83aa9b83bf976b280fa5e31413dbd76/40178206135.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/26eba3e891f9c21e2de4691b856b3b01/40793292825.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/ritobamilopasewokobis.pdfIn PDF document text
    • http://pvvc.cz/files/44131612772.pdfIn PDF document text
    • http://meetburgerusa.com/uploads/files/68607063212.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16078deb4b194c---40223593776.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/37356695122.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609c199a375d2---nasegegaxuzo.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/39629098990.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e51b1f454---97693733957.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/juwosasakezosezoja.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160834842cdb16---kijovebidaseraxib.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf916bb993---dawotokoroxaginagajitu.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_off0000e468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE468 19304 bytes
SHA-256: 13abc0e5ccbe9151b27c8354c65bd1073875d2b0cebb1e13491a9a5dec3b9f90
font_01_sfnt_off000115d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D0 10916 bytes
SHA-256: 1bb6da3394f754a1c16aae5d2ab2ff66d53701a52d15c6023f062a4cf5cfa15f
font_02_sfnt_off00012f2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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