Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a13cdbec495e53f…

MALICIOUS

PDF

98.5 KB Created: 2021-09-02 13:14:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 96af5434eef06c61a8cdce08b80d4dcb SHA-1: 203bfbbc5684efb008b9f7aa98e50993ff743895 SHA-256: 5a13cdbec495e53fb7239c3a56fb2969fecd8c188e38b70983831a2c4a1076ef
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, several of which are hosted on compromised CMS upload directories. The presence of these links suggests an attempt to lure users to potentially malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

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 http://sooam.com/files/fckeditor/file/1176686067610f9ec15ea77.pdf
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e95ea5d486---guremozexima.pdf
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/2be1d23196dd06ef32866f1713108c99/99562441228.pdf
    • http://mudrkanuch.sk/editor_uploads/system/files/19084123697.pdf
    • http://tbvshungviet.com/upload/files/dawixutojojefub.pdf
    • https://hohsingfiber.com/ufiles/files/25304614823.pdf
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160db6eb6bff66---97578525173.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/133e5f3085bf21089a3ccdb9246cd60f/15972067959.pdf
    • http://peusch.lu/userfiles/files/waxenoraburas.pdf
    • http://hyunbulsa.org/~ewedd2/userfiles/file/fexojega.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/620f7a5034d5fe264806457c56e21230/28186725061.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f09b5fc04f6---famalodusufagewuguzaxi.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0b9754dd7---81527887943.pdf
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/ponelepomo.pdf
    • http://classtool.info/upload/files/53035624021.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160a5fa09b0fb2---dalesilovovezudawe.pdf
    • http://tcihk.com/userfiles/71221567968.pdf
    • https://marblo.ph/app/webroot/img/files/61461479324.pdf
    • http://twfindia.in/userfiles/files/gobowim.pdf
    • http://narnivet.com/userfiles/files/8493966599.pdf
    • http://langfordfinancialservices.com/userfiles/files/mimamojetikugak.pdf
    • http://noxsun.com/jingkelun/userfiles/files/20210623205245.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701f3479f53---95282163881.pdf
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/of4rtbdbektu8npl64arr1f9p0/42139768068.pdf
    • http://taiwanquinoafamily.com/shopadmin/upload/files/fizojewinitutenafexak.pdf
    • http://fecirturizm.com/resimler/files/mubujalagomubevinilosesu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=statistical+method+of+demand+forecasting+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_off0001188e.bin
b0819da022c2b3357427816e49083b5816c189452d6ccc1afcd2d1e8b6227ef3
pdf-font-stream PDF embedded font (sfnt) at offset 0x1188E 18932 bytes
font_01_sfnt_off00014a63.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14A63 16792 bytes
font_02_sfnt_off0001627a.bin
903d238f8e86cd1b2ce273c2a7aff6a7c6b31237a0b65b8435146a59fb72d01a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1627A 11140 bytes