Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b8dd28f21a0429f…

MALICIOUS

PDF

89.0 KB Created: 2021-09-14 02:38:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4d1cdf0db33991477e11c0e1fe197c5b SHA-1: 90fe3ef472f0536664da399bf8b0cf2faa32895d SHA-256: 9b8dd28f21a0429fee125b9052bfe2cc04b5e8f4ea1f07448548a1f119c2e383
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farms, with several pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://queure.ru/uplcv?utm_term=road+bike+games+android PDF link annotation
    • https://hyosungulf.com/uploads/file/renagemexipuxibulopowut.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/pakonupusoveponox.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/55648180471.pdfIn PDF document text
    • http://mega-gold.com/userfiles/files/borigudevokomofevol.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134c9b9312a2---bazudufulepuloj.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/dawebidizexomokoxafabom.pdfIn PDF document text
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/48175932108.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/gijufu.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/20660600174.pdfIn PDF document text
    • https://karlholmbygg.se/UserFiles/files/mapusevumotuxilokowiku.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/nikipajonil.pdfIn PDF document text
    • http://dae-young.kr/upload/fckeditor/file/42423502157.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/vuxedevid.pdfIn PDF document text
    • https://blugarden.eu/file/86830985150.pdfIn PDF document text
    • http://idcla.net/upload/files/mukaf.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/85305480253.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/58665487813.pdfIn PDF document text
    • http://jenistudio.com/upload/FCK/file/rapamujoja.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/91511215939.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161362672d4d5f---7865926176.pdfIn PDF document text
    • http://videotour24.com/data/fckupload/file/3257241285.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/zoduvojodu.pdfIn PDF document text
    • http://dgelc.com/userfiles/file/20210902170731.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613af5aee2786---tuvupatokad.pdfIn PDF document text
    • http://sspvjd.com/FileData/ckfinder/files/20210902_57006210CA95A5C7.pdfIn PDF document text
    • http://tykhchem.com/upload/files/dipuralegefitaxafonuretim.pdfIn PDF document text
    • https://tanhaithanhvalves.com/quangcao/admin/file/zevuroxukubiza.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_off0000f50b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50B 10724 bytes
SHA-256: 322cf7c43411f55068f13393148757ed0dc1a7e6c1cc37a3cba46fe957e89787
font_01_sfnt_off00010d66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D66 19236 bytes
SHA-256: 0121d94d7037f6b43e4bd83fc56a8bbb6bff782e2b9a399c14603158555bb1fa
font_02_sfnt_off00013e24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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