Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfc2366d671cb340…

MALICIOUS

PDF

75.9 KB Created: 2021-09-23 23:18:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 8fb8813a57d2e2776465e1b1dc6bf2ce SHA-1: 06c84a70757971de8e7aed2f1c0f38a47f831a85 SHA-256: bfc2366d671cb34062087143484ebd5beba8ea53203a6bfe1f6f73c5ed3afb4b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to various domains, suggesting a link farm designed to redirect users to potentially harmful content. The heuristic firings indicate that the PDF is structured as a link farm on disposable hosting, with one URL specifically mentioning 'pdf file download for pc', which is a common lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://garglob.ru/uplcv?utm_term=pdf+file+download+for+pc PDF link annotation
    • http://turbotechnik24.de/userfiles/file/xizebes.pdfIn PDF document text
    • https://mimpishiosatu.com/contents/files/wanapabipigiwogulageloxi.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/50445005468.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/21489731116.pdfIn PDF document text
    • http://mamnonkitty.com/webroot/img/posts/files/negurezoves.pdfIn PDF document text
    • https://testpensija.bankai.lv/ckfinder/userfiles/files/mojifupatobitibosifupukis.pdfIn PDF document text
    • http://jiab.net/userData/board/file/42369770270.pdfIn PDF document text
    • http://annabarons.com/files/files/wotefidoma.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/igsvaahvdcoa4ii4925uj93pn7/sefiratutide.pdfIn PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/tevafakadi.pdfIn PDF document text
    • http://saydersan.com/firma/files/14187779371.pdfIn PDF document text
    • https://rumusjitu.com/contents/files/zuvonaremebitesiwix.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16140f563168d8---82717213015.pdfIn PDF document text
    • http://exms.fr/sites/default/files/file/70760078037.pdfIn PDF document text
    • http://www.benyowsky.com/resources/files/zaxuvarupegekopalexekiva.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143c9bf009db---2538328229.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/vozatozeriven.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614009e86b080---puriwomorekibu.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/42028771718.pdfIn PDF document text
    • https://mollis.rs/files/20837998971.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/40128286991.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/69792995041.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/fopinijat.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/pomigofejalitiditavem.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/92664995169.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_off0000c83f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC83F 10432 bytes
SHA-256: 3125ca4ffdd7858ce316931191cb525409c7700aa84bf22e96ce18d88fb8e6b5
font_01_sfnt_off0000e002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE002 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF814 16276 bytes
SHA-256: 5746ad5978561463ac410d59ffd3084de1b7e49e5e329b763a916f0077090bf6

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