Malicious PDF — malware analysis report

Static analysis result for SHA-256 314113ab6698ff65…

MALICIOUS

PDF

69.9 KB Created: 2021-09-29 02:16:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8194a4450e85c785f5d0afa53a3abf7a SHA-1: 4093889effd28fefd2eb00c3ab9a6e2ed1e5f78e SHA-256: 314113ab6698ff65012e7d8275993eda15bdc6c5b9812383dcc5e29e70d4c83d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories or are hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://wastran.ru/uplcv?utm_term=tom+and+jerry+fast+and+furry+full+movie+in+telugu
    • http://spreewaldpension-luebben.de/meineBilderAlbertGrundschule/file/gibite.pdf
    • http://changrung.com/ckfinder/userfiles/files/58512947383.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148cf2295dea---lifodomugozutegiseweno.pdf
    • http://riverla.vn/uploads/userfiles/file/mafusivijufuvixap.pdf
    • http://domoticasociale.it/immaginiNewsletter/file/50516521675.pdf
    • http://www.startbatteries.gr/ckeditor/ckfinder/userfiles/files/dewusokutirirajinil.pdf
    • http://woodbridgeabw.com/uploads/files/falivejamobokenivow.pdf
    • https://pmapmc.com/userfiles/image/files/bovar.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3f46b92b6---gaxefaw.pdf
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/ob6993uf5pll52io1l7104lof5/sebavu.pdf
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/nogawikemifiraxaj.pdf
    • https://www.rapn.ru/ckfinder/userfiles/files/gavuzujedilepi.pdf
    • https://gtselect.fr/ckfinder/userfiles/files/kunela.pdf
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/logoza.pdf
    • http://lovesenergy.nl/file/nifoduvugibiloze.pdf
    • http://hoanhaochemical.com/uploads/files/vakizuxetixej.pdf
    • https://afra24.com/basefile/afra24/files/besezovutal.pdf
    • http://korytnica.net/data/files/79101723288.pdf
    • http://unseenadventure.com/userfiles/file/jekenazekerevugasoporo.pdf
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/24e8182aa122701784d6bd8eee3591bb/gotabibirudifo.pdf
    • http://gurukripapublicschool.org/userfiles/file/12500145611.pdf
    • http://drivingschool-brno.eu/files/xukufijuniwalejibekit.pdf
    • http://kleinschadenexpert.com/userfiles/file/73478429088.pdf
    • http://artattack-concerts.de/files/file/votizademekutepatirixu.pdf
    • https://mimpisiluman.com/contents/files/vekedenefifigubevozuxu.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1614959c99ace1---dunobuwuk.pdf
    • 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_off0000b399.bin
f7fbf60e6b8b2a0cd9b3c081f8c67c07452d65f492d9c5bc5b39728895850e7b
pdf-font-stream PDF embedded font (sfnt) at offset 0xB399 14644 bytes
font_01_sfnt_off0000d825.bin
c6565b56d1043bd2faf9ad047ee2e912c5c8791cd5a30532d1492577e3e038c6
pdf-font-stream PDF embedded font (sfnt) at offset 0xD825 11072 bytes
font_02_sfnt_off0000f1b8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B8 16792 bytes