Malicious PDF — malware analysis report

Static analysis result for SHA-256 161183a6f62a0703…

MALICIOUS

PDF

71.1 KB Created: 2021-09-19 20:12:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d538f49bc93fef8c5111bbe303874443 SHA-1: 3fa5e1ee5203f3cc2a1562c0294de3f6bd30076e SHA-256: 161183a6f62a07035a63063cef6a32df8c51f1d909f72b8184e04281dc4044a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised WordPress installations. The presence of these links suggests an attempt to redirect users to potentially malicious content or phishing sites. No scripts were extracted, but the overall structure and URL distribution indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://cructi.ru/uplcv?utm_term=infidelity+in+suburbia+movie+watch+online PDF link annotation
    • http://elosc.com/upFile/file///ITX202109101109282880.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210918194544.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/21337492488.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/55745403795.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/063698c0008d6d71c8a338eb5f101062/benatukirazidebi.pdfIn PDF document text
    • http://zhuxintrading.com/uploads/ckfinder/files/20210901/16304467639583.pdfIn PDF document text
    • http://otestmanager.org/club/data/userfiles/file/20210911202413.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/48492227635.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/xuzufexupitem.pdfIn PDF document text
    • https://linker.tw/files/24585592780.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16146f9a9c8bb1---90571119807.pdfIn PDF document text
    • http://shanghaicruiseparty.com/uploads/file/4420456561.pdfIn PDF document text
    • https://8cj2aja7-8mxb.com/contents/files/66239968934.pdfIn PDF document text
    • https://venus-forever.com/image/files/97011993975.pdfIn PDF document text
    • https://mkontroll.hu/File/getebufekaxufizizewilobi.pdfIn PDF document text
    • http://stellarp.com/userfiles/file/tisubuzujerajenawopaka.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd48c40b2a---31609061444.pdfIn PDF document text
    • https://skywaytravelandholidays.com/ckfinder/userfiles/files/mogomemadawufomexapiz.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e701bec552---rexaxaba.pdfIn PDF document text
    • http://astorandblack.net/emailer/userfiles/file/28886143210.pdfIn PDF document text
    • http://xsjsbzrw.com/uploads/files/bijegafamine.pdfIn PDF document text
    • https://jdrum-music.com/uploads/ckfiles/files/34986504563.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b5cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5CB 15764 bytes
SHA-256: ecc6c5f733a0d342ed3f19d312e67d4fc06653074de966a674cf7ffc58236171
font_01_sfnt_off0000dcf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF2 11200 bytes
SHA-256: 2386b30ed30c4327591d13938af5cf8fcacd8dfcefde26450625150e924cb0db
font_02_sfnt_off0000f707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF707 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1