Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f317ee449225498…

MALICIOUS

PDF

76.1 KB Created: 2021-08-03 08:50:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 06f3a220bdc6cdd360e06d2302ebe06c SHA-1: b82be5c548b5c5f9d45eee78ea9e6d5633a35419 SHA-256: 6f317ee449225498d0beff5a2f9b5abc853b492a1a9cfa8b1e1739d09683b9e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to numerous websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting an attempt to distribute malicious content or conduct phishing. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, likely related to initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/a023558f587674bf43d61a650bb5a80c/gixixatusubi.pdf In PDF document text
    • http://doubler-son-capital.com/photos/files/32746018412.pdfIn PDF document text
    • https://murten-hotels.ch/userfiles/files/80807680754.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/89190197100.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-7-19/20210719081520193608.pdfIn PDF document text
    • http://hebertfamilyreunion.com/clients/3/32/3272330ca4c68e8b1120eb7f178c7a05/File/2345239905.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160733d4c7d15f---derevijugumaxugazo.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/rerimozalijuxonajakerak.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/e7pa5fs0v99bo2ubj3slai7p1v/59368319176.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/4915e3169bce28731301c16d8c4586ad/23085616021.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a059d5c0959---dudinizok.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8a6cbd736---43923663668.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ceba498f54d---63201498086.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/f34cfba9a547e8b354dd4f4a25e39734/72756034536.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/norofefasozumov.pdfIn PDF document text
    • http://nyett.hk/uploads/news/files/novarateguvunivalekexeduk.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/394dc60eca400cd0d62f967c14d5281a/wezab.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/64118019166.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/26808478033.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/7291173342.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/l378defhg778t7rfqikeutabpa/5833997971.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc0981b238---rejimojurukotazudinuw.pdfIn PDF document text
    • http://trickorsuite.com/clients/5/5d/5d84d12f6f4dfd10bbe5497c884a5f3e/File/41145195344.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+set+up+generac+wifiPDF link annotation
    • 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_off0000c53e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC53E 10784 bytes
SHA-256: 5370a8c39ac2dd34f5a3f34492a67f752aa0fb6dd6b2d3640e09f43a1212e94c
font_01_sfnt_off0000de44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE44 17044 bytes
SHA-256: 3717e7eb74b151839b2cfa6ec3d4428c0bf243013456afa846ab1bf7e23d64be
font_02_sfnt_off00010b2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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