Malicious PDF — malware analysis report

Static analysis result for SHA-256 3769e198b317eaf2…

MALICIOUS

PDF

89.0 KB Created: 2021-06-29 09:03:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0ee9f96760c859aca475df3e43b9f965 SHA-1: ce8d717721cd01a02344160104eb35123423d60e SHA-256: 3769e198b317eaf2726049d11569fbe5797bfa319b638d71dbc584190b09f45a
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, indicating a phishing or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lead the user to a malicious payload or exploit. The document body is unreadable binary data, but the heuristic firings and URLs are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16093454e4c012---vivotuwibiwafeminawideja.pdf
    • http://akicgiyim.com/userfiles/file/49744658075.pdf
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/4bcc733187d48cd0ea1dca5df9839dc2/vogakom.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2a03e48fde489d1747507a6f229d0f8c/mamidagepunuma.pdf
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c9e9ec2cb---14957802870.pdf
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/a638c2945fb4aca505d926810bbd0e72/82504443196.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/c7670d84e0593bb7274d2085ce216d2a/82536407318.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d227e616fe---givawapurulojasarezejim.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/0adec248d1e42f5fd37678296f0d76a8/95786852547.pdf
    • http://tillmanfamilyreunion.com/clients/b/b7/b7385abc5988d1ee605fea7695e3d00e/File/96651463369.pdf
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/uomdchgpdbn8f25s25quk017kc/99980642093.pdf
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/ddf5ce16c8381c1cd47e870befe2ef86/8700558654.pdf
    • http://soft-pro.hr/upload/datoteke/jebekobiruzadimalirox.pdf
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/vebanadutajawevavux.pdf
    • http://allprintusa.com/admin/images/file/sunezimafaboxavinudad.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/0aab31709a5205127142a60a8568fb8d/29403642879.pdf
    • http://klpa.net/userData/board/file/navegagowijekan.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4d52dff9c---41769337134.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767aeb0fb6d---29627074432.pdf
    • https://autotrans911.com/thread/admin/uploads/file/73077640100.pdf
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/f90179a2a125a85e43eb78271140204f/guvufalijaxezusujavesod.pdf
    • https://sca-kc.org/scauserfiles/files/remej.pdf
    • http://usdcp.jp/user_data/userfiles/files/lovekivuvuvalis.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=a+wagner+matinee+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_off0000fa6d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6D 16792 bytes
font_01_sfnt_off0001127f.bin
e74272a0195cd82628f6728016437a5bfcd5de24f7be7ec7c2f37363f39ae074
pdf-font-stream PDF embedded font (sfnt) at offset 0x1127F 16836 bytes
font_02_sfnt_off00013da4.bin
b944b63bcfb71344237af1fbb292cbe61a0c1ddb28093041825cdc23a6df640a
pdf-font-stream PDF embedded font (sfnt) at offset 0x13DA4 10572 bytes