Malicious PDF — malware analysis report

Static analysis result for SHA-256 5492dd12f69a4afa…

MALICIOUS

PDF

81.5 KB Created: 2021-08-26 06:43:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a068c689df8ef7a10b92ae4954049772 SHA-1: d399b2a91a8da22265383ff1cbaef187501da291 SHA-256: 5492dd12f69a4afa49edfd5bb1f3cb4c1fa96c278c3694d2c36fc2f26c7d824d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the primary attack vector appears to be the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://abofahed.com/userfiles/file/97159529781.pdf
    • http://szakkepzosiklos.hu/upload/file/75066154178.pdf
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16088a837be3bb---25312914404.pdf
    • http://brainbond.ro/userfiles/file/86885989417.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf6d28c941---naraxirosojogu.pdf
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16080b524b3da9---zoralodogukano.pdf
    • https://odlingfamily.com/userfiles/file/pejajewowoxubaxal.pdf
    • http://zrdb-drogbud.pl/Upload/file/vasosixefuku.pdf
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210621204340.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a19bf1a4710---98111380514.pdf
    • https://osikovo.eu/webroot/img/content/files/8810741906.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c75885517---xelutedimezusafibik.pdf
    • https://codecs.ro/images/file/73286788520.pdf
    • https://2winit.com/Files/files/53823341488.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160e1f895079bc---61698786876.pdf
    • http://dd-eng.com/files/files/jeroba.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/vd8a8emt13vcqvtblvgv9pgp29/kalugazinaroboloperi.pdf
    • http://struttur-arch.it/userfiles/files/67465623827.pdf
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/8581096008bf1ada95f27e3387d38182/nomedidabuk.pdf
    • http://onishi-kyosendo.jp/archive/92544805493.pdf
    • https://drvishweshwari.in/userfiles/file/29603722141.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160aeaf5caf75a---sedosijoxopomevu.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/aq49pong323bd68vi9jrhnushd/tizikugikatar.pdf
    • https://performanshost.com/calisma2/files/uploads/bisowodiraxiwusanu.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/rk8u72rstje5j9fbl6ta7fsp78/sudifavubeg.pdf
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/7abc87c9f6503b3a8745febafa15f72e/66107134530.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=foreplay+before+intercourse
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d89b.bin
d7d9c719c0a6463a23e8c3f82926ad0fabda12b7d719efaa6b6f2e85d9256476
pdf-font-stream PDF embedded font (sfnt) at offset 0xD89B 10804 bytes
font_01_sfnt_off0000f16a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF16A 16792 bytes
font_02_sfnt_off0001097c.bin
5de4ad2edaca219bc47dc0ee616a8181f6fbaf93615408b4f940f048fec476ad
pdf-font-stream PDF embedded font (sfnt) at offset 0x1097C 17268 bytes