Malicious PDF — malware analysis report

Static analysis result for SHA-256 118dd14a1d439d15…

MALICIOUS

PDF

87.9 KB Created: 2021-08-08 20:16:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 34312a3f7e8b7582a155fef4fc54c7a3 SHA-1: d3a5ea11c9b78b0e42e5d1c6ee311721074c2368 SHA-256: 118dd14a1d439d15e2f6d5afb3b074ed80e3be85eeaa9137c386df6b16371e0f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically indicating phishing and Trojan activity. The document contains a link farm pointing to numerous compromised WordPress upload directories and disposable hosting sites, suggesting an attempt to distribute malicious content or phish for credentials. The ML classifier output of 0.997 further supports the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160757c387dcb8---maxegufibulirux.pdf
    • https://landbondcorten.com/attachment/file/36475b00b2f5fbf7f4659c573484fc7f.pdf
    • http://dissanna.com/temp/fckeditor/file/25683822768.pdf
    • http://romanakladatelstvi.cz/userfiles/file/veduranetum.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd3afb9988---12239799279.pdf
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/45f34e241183ad56c4155fe85b0d7ec1/fazimozadexesavomas.pdf
    • http://yucekalipmakina.com/tsrm1/img/userfiles/file/tojub.pdf
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607caf69a2e66---23515437321.pdf
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/4db3cd664007892f77b9000b46441f44/rusim.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e320a49a80---wenametasemakep.pdf
    • http://thebrownsfamilyreunion2008.com/clients/81208/File/35251556499.pdf
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160890e9e541ee---35469046575.pdf
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160fb760130c8d---kituvibudakiloxajoki.pdf
    • http://cdhsalumni.com/clients/28864/File/lizuxeledoxelesenizoba.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609a205d45691---9315669178.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d11b7db16---59744412908.pdf
    • http://al-farh-iq.com/upload/userfiles/file/34966885110.pdf
    • http://mentaplywood.com/images_upload/files/73682218826.pdf
    • http://poiskvod.ru/images/file/fewezodusebujasewamefik.pdf
    • http://www.cbs-emballages.com/upload/file/zifepuxegezefaxorole.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2e1885e5f---2460895481.pdf
    • http://longchimvac.net/app/webroot/uploads/files/46065912898.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3533cd0216---pufavegijalo.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a78878a4e7---xakowijeberanariborivomu.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608223ae579f8---41132319020.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=rachel+van+dyken+-+elect+02
    • 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_off0000f466.bin
66b22602bf409b9abbd64839e3984797eec20c267382f215a71648e0ed8e34ad
pdf-font-stream PDF embedded font (sfnt) at offset 0xF466 10580 bytes
font_01_sfnt_off00010cab.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CAB 16792 bytes
font_02_sfnt_off000124bd.bin
a77a03274dd2bac9e92dee7df61b63e0749a525063608023e2b5273fa1610b20
pdf-font-stream PDF embedded font (sfnt) at offset 0x124BD 17424 bytes