Malicious PDF — malware analysis report

Static analysis result for SHA-256 901633d55809e2b7…

MALICIOUS

PDF

85.7 KB Created: 2021-09-08 02:49:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6008d476678b1a796eb9b4dba250ddf4 SHA-1: 83deac296aab80cc3b0810712c0e43b8832b870d SHA-256: 901633d55809e2b7ea4ecb51f11a3482e47e93f994479963a8b402a8db1088e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the presence of numerous external links indicates an attempt to lead the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ketchas.ru/uplcv?utm_term=manual+de+reparacion+nissan+versa+2011
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/4b16a02e040cb49344b6257f960ec7ef/netifodete.pdf
    • https://bikidi.com/UpFiles/WebEditorFiles/file/9819530303.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092784f701c0---12441234560.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160845a7a38071---mirefumekewemusizaveram.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b93a16af2d6---xodonatefuvatovaxase.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a920bbe6e2f---35531693759.pdf
    • http://c2r-auto.com/uploadfiles/file/2021071304532373499.pdf
    • https://gionggiacam.com/ckfinder/userfiles/files/lilupifonojokaxufowe.pdf
    • http://akademibt.com/resimler/files/zefufijud.pdf
    • http://formpart.com/upload/ckfinder/files/mogifi.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f12226f0a6---tefake.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/473da257c7dd1df2d10ecb4560af3ac7/pewinatoxe.pdf
    • http://meteosputnik.ru/userfiles/file/33522789866.pdf
    • http://lucann.com/Upload/file/xitiwukegoganejejafuf.pdf
    • http://miraesusan.com/ckupload/files/tapaluxadimaremijebu.pdf
    • https://techson-cctv.com/upload/file/90922420318.pdf
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160782835a3796---3840385915.pdf
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/4697349524.pdf
    • http://barbusci.it/maisUserFile/file/41271360063.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f951ae8c1---77948844551.pdf
    • http://cpgny.com/userfiles/files/zudugepurepunanerumokite.pdf
    • http://rklatex.com/userfiles/file/86482622816.pdf
    • http://mcleod-bobbitt.com/clients/64742/File/61100141316.pdf
    • http://aliguoriarchitetto.eu/userfiles/files/63855460292.pdf
    • http://jevades.com/aircraft/fckimages/file/xubematalinozesosipe.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_off0000e89d.bin
81fca58dc15cb9b281d7a012d2900fbda52c5377ffb8c4aec9eba3bd9afc77fa
pdf-font-stream PDF embedded font (sfnt) at offset 0xE89D 10860 bytes
font_01_sfnt_off000101d3.bin
1044941547dc376191ff34323f050c754d55baca33ae333ec1a21f8a232475a7
pdf-font-stream PDF embedded font (sfnt) at offset 0x101D3 18148 bytes
font_02_sfnt_off000130e6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x130E6 16792 bytes