Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8f6e04f09e07d67…

MALICIOUS

PDF

76.1 KB Created: 2021-09-14 03:38:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5cb49ccd7d5773e8834eb3250be18099 SHA-1: 84c599f45ffc7680d9e5e2c02d37a1db012bf2f4 SHA-256: a8f6e04f09e07d67bdd9f04c32f971bdcdf534bf701fff198e46d7154fd6eef9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, suggesting it's used to distribute further malicious content or conduct phishing attacks. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights the nature of these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://smidgel.ru/uplcv?utm_term=homm3+hd+edition PDF link annotation
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/59ab9cfdd8eb829f9242a6a97d52c228/75283178041.pdfIn PDF document text
    • http://isgsrl.it/images/file/69121205347.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/bd46rcjp877n8nplgl04bi8m06/vapevelurefagebopate.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612eaa85497f1---zabubojazaxegakonudem.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/34681580491.pdfIn PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/vejukiburanadepo.pdfIn PDF document text
    • http://inlovehuahin.com/file_media/file_image/file/tabibadapovoxosu.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/89388240249.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/vexatokasamovo.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/9091343574.pdfIn PDF document text
    • http://vector-luczak.pl/new/fck_user_files/file/46708431722.pdfIn PDF document text
    • http://roberlo.cz/www/files/file/46749936619.pdfIn PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/17116185690.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/6d59e83edae9f9b00c1d570b7c23265e/danitesaduniwo.pdfIn PDF document text
    • https://unitedfightalliance.jordanadams.com/ckfinder/userfiles/files/suvadumaxapamewuwujuvu.pdfIn PDF document text
    • https://xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/3595235194.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/b20706a7681a25a01c5c04b5ccfca33e/86210674380.pdfIn PDF document text
    • https://newcar-rental.com/uploads/files/202109100318316805.pdfIn PDF document text
    • http://audiohrestomatiya.ru/content/file/xasup.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/fidefanujorabukave.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/vosigopetudorifuv.pdfIn PDF document text
    • https://tonerihned.cz/userfiles/file/45002362680.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_off0000c543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC543 18052 bytes
SHA-256: b2b9acb06a77111b9b3b5559819ffe77a30810cff66e241b131dddb27ec77329
font_01_sfnt_off0000f484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF484 10200 bytes
SHA-256: 6797a23cd9eaaef62e45d6fe3c95240687fad8fb90fde2d2d58e566cd2ec16a2
font_02_sfnt_off00010b2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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