Malicious PDF — malware analysis report

Static analysis result for SHA-256 d387a8cdae5a1875…

MALICIOUS

PDF

91.1 KB Created: 2021-07-31 18:57:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 6e66ba22ede9a137cc1938ff6554066a SHA-1: 137d30d4ced569378d8601906792f6e0d7e62ae0 SHA-256: d387a8cdae5a187595318e5c7d47a85ade4aa340f5bec5f812ad5754eba31c88
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a large number of embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm or phishing lure. The primary goal appears to be directing users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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://garglob.ru/uplcv?utm_term=ejercicios+de+molaridad+molalidad+y+fraccion+molar+resueltos PDF link annotation
    • http://animalscipublisher.com/files/upfiles/file/96447149249.pdfIn PDF document text
    • https://wagaskar.com/media/kejomovakagaxisuxe.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/25ab0lds7bjl5uql9sk8cqvbon/pekekenixawuxuxu.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/833a4d8ea0c86ea561ce4f81c0ee7fda/28320571457.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e22953e3c---vutakidita.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/b7ed6e4226158bfb0006d07077bb8684/zuwipevikatujukiwo.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/32230294993.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/4d044876f8b836b65965341c6f73fda8/fizaxizuzak.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/8018218050.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16074a015200b6---gudewazivimatanekivom.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/rkplgt77jan8565cg3qegl3m15/31291685348.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/a3c96b7956fb4ad3ecc4426b8fc21f18/zuxemufa.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/f932d59cb27200946832d1c898bf7c45/duzipavigakisosoxume.pdfIn PDF document text
    • https://360mart.net/uploads/files/61670802394.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/bojaditojosolagabide.pdfIn PDF document text
    • https://5a.ro/ckfinder/userfiles/files/84227989312.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/d5cfabbace34ceb4e678b29976744856/31637078864.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/sujilewap.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/74242591367.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/saluxuzadejisulip.pdfIn PDF document text
    • http://bellsazshihtzu.com/clients/878694/File/99781039288.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents//files/xijetiw.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0bb4c3356---87784039764.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/76749810525.pdfIn PDF document text
    • http://mentaplywood.com/images_upload/files/24214868695.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/gakabelulaw.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/kujemikikiv.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_off0000fae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE1 18248 bytes
SHA-256: a5db40800926647a89842a1c1899cb8dd7205b570fdfcd97818e28142c4051b7
font_01_sfnt_off00012a05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001421c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1421C 10964 bytes
SHA-256: 59b1232b8c43d161821dfc18fba1b5799e607e0c8af26be352472adad327e909

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