Malicious PDF — malware analysis report

Static analysis result for SHA-256 8134684703610a17…

MALICIOUS

PDF

81.0 KB Created: 2021-07-09 09:07:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 19eb6bad16b8f5dcdf7e9594c0936b66 SHA-1: 1b9982021c0c0729b517a3b0ae7b368f8a10c7d9 SHA-256: 8134684703610a17cd4b8a2d229a34ec7073a936836fdcde06348cad41361b90
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Static analysis revealed numerous embedded URLs, many pointing to compromised websites or disposable domains, suggesting a link farm designed to lure users to potentially malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights the non-clustered nature of these links on disposable hosting, reinforcing the phishing or distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://crewmak.ru/uplcv?utm_term=ending+video+thanks+for+watching PDF link annotation
    • http://euro520.net/userfiles/file/1622124286491801620.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/tusajuwanenelozuvigi.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/lusoludoreda.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160afff52ed7e6---basilisikeduzemabap.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/99021242545.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df6703f037---39483637381.pdfIn PDF document text
    • http://bronia.org/userfiles/file/92561948329.pdfIn PDF document text
    • http://www.asslar.de/downloads/furokilotulevagutiro.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160add918905f6---13522628022.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/37792487279.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/58b38c5926d2d3fec2894eb24a726859/fadij.pdfIn PDF document text
    • https://cmsschoolkg.org/userfiles/file/45552479503.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/02b5fe97d9d99a5a41785c064c301a48/noriza.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c457c029e67---ruregomide.pdfIn PDF document text
    • https://argumentua.com/i/file/81967310038.pdfIn PDF document text
    • http://easttbirds88.com/clients/d/d7/d767393c090093bf18db16876c07b5c3/File/47226490058.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/matesikekuliv.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/63744257471.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/noxudul.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/wobigejapimiw.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/84372272011.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/c3484df4c24438b8215a56f8bc2a37d0/21800240035.pdfIn PDF document text
    • http://jtipartner.com/ckfinder/userfiles/files/vitegu.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c02f283bd88---galojosifujitibetowe.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/daeaf6974ced84c2c70a07b626c1db22/kefisikonidowojige.pdfIn PDF document text
    • https://le27.fr/docs/file/wexajunu.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_off0000d814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD814 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF026 17188 bytes
SHA-256: 2737088c553dadaac103fcea7d030616fa72fb0fa3b776fb98d71f0632e6eb87
font_02_sfnt_off00011d34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D34 10936 bytes
SHA-256: 1c96ff17a25536b0f4f10aa2ab7b11f5c55e1e4fc9334100d5a8c3ad135dab7b

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