Malicious PDF — malware analysis report

Static analysis result for SHA-256 42e0d575e738f307…

MALICIOUS

PDF

83.2 KB Created: 2021-09-04 20:04:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 34cb656e6d3bbbd4e8479ac599e37e8a SHA-1: 5b84685a73f06f4e0a6050882df4263b2b4f9ea7 SHA-256: 42e0d575e738f307d8a4d7ab7a5bd0e93ac93da72bf72b211aeb8e7aa9635254
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072c4fedb205---46428860837.pdf In PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbffab895d---88018052228.pdfIn PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/tofed.pdfIn PDF document text
    • http://xn--b1adbbbaeqjtsflbfms0e.xn--p1ai/pict/file/gokag.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/33994e18ec58c50bae96a6154ed05c3d/44145276958.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/93408845955.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/9pbjbs68ojpclri6tqbi1vj86u/91618497911.pdfIn PDF document text
    • https://elesud.it/img_pagine/file/19651344809.pdfIn PDF document text
    • http://www.farnostbobrova.cz/ckfinder/files/bidipakanabarewufa.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a47b9acce---bizefoxetorukiwidon.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a6b75ceac---duvaxiv.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/zukurewanikulopelowuf.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/088e3a11d75dbf4247ccd91f5838d93f/1448961472.pdfIn PDF document text
    • http://deauville.ru/files/file/53167552734.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/73361553970.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/t9gc7sboau9ph2f71jou3vl8f5/82788031318.pdfIn PDF document text
    • http://orhs76reunion.com/clients/30721/File/gelotubikesurorebid.pdfIn PDF document text
    • http://hflbdq.com/uploads/file/030306034607.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/0or59950rb4kcriihej2m2kdp5/53229674997.pdfIn PDF document text
    • https://anjingliar.com/contents//files/12100519660.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/632e3b311601fc040f3722c1b8be09e7/rinunijifufavusarubibotuj.pdfIn PDF document text
    • http://cuacuonbinhduong.com/upload/files/kemabofagaviloke.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/vilufiruwe.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/bafazajipepunefage.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/vofepag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=christmas+lights+coldplay+piano+pdfPDF 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_off0000d825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD825 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f03c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03C 11080 bytes
SHA-256: fcbb0517cea1f2e639f12cefe827851578c178ef5370e26b0ca1f18dc4df7a50
font_02_sfnt_off000109b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B8 20700 bytes
SHA-256: 9653448c405401547aab10e61403eaba6996c015b4316545cf46253aa54d93a9

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