Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9d846f9ec436f4b…

MALICIOUS

PDF

85.8 KB Created: 2021-07-20 15:38:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b5d10f93ef6ee86ba10c54128732b752 SHA-1: fb7f9a94b7260c9b4683fd35b5b922aa4374f82d SHA-256: e9d846f9ec436f4bf36c33276c20060d1125b491e7363186be59060c617aef01
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. These links likely serve as a lure to redirect users to malicious or phishing content, a common tactic for initial compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f55018090---majifosagujofijas.pdf
    • http://caf-ljubljana.si/docs/nezodofopesififefisurabi.pdf
    • http://imhyuk.com/imhyukeditor/userfile/file/37289678165.pdf
    • https://travelworld.ro/userfiles/file/nomopuredalirobiju.pdf
    • http://soldresold.com/Shradhdha-Mehra/soldresold/final/ckeditorimage/files/58138399625.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16092f0b09d987---97571945911.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f728b0b2a---gugepozezajabinuk.pdf
    • http://www.christianhouseshare.com.au/ckfinder/userfiles/files/70292736306.pdf
    • http://anbao.vn/uploads/userfiles/file/61807288502.pdf
    • http://georgefamilyreunion.org/clients/86186/File/15202254715.pdf
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/29598127114.pdf
    • https://securitydm.com/slicice/file/44403009249.pdf
    • https://aashianarealty.com/file/wodebisopoginibalozoz.pdf
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/aea043a41087504171dc75794ab0f44c/12192816997.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd35c9c98d---87150344510.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7d409c4e9---84104131803.pdf
    • http://lohsclassof70.com/clients/3/31/31ca850ff086a58b81c8700e10a01852/File/vosamubanerigekavod.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/f4821e42b7856f0b46362ac3c0fb886c/xafufujara.pdf
    • https://advantagelic.com/singhania/downloads/file/82825068026.pdf
    • http://www.hydro-tg.pro/upload/file/xurube.pdf
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/e10618187fedf14bd0be1af938f63f44/tibivebu.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160849222d26bd---72895026496.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=rectified+meaning+in+malayalam
    • 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_off0000e8b6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B6 16792 bytes
font_01_sfnt_off000100c8.bin
beaf7db533f323ff343fee468adf8c03cd43c67a73938d0cfdaf85c06227242e
pdf-font-stream PDF embedded font (sfnt) at offset 0x100C8 18780 bytes
font_02_sfnt_off00013216.bin
20626aa6165e4e3d090c815eb92a85fc10252821799e86eaff7e120d020f7a73
pdf-font-stream PDF embedded font (sfnt) at offset 0x13216 10588 bytes