Malicious PDF — malware analysis report

Static analysis result for SHA-256 43258a4b1b8c1376…

MALICIOUS

PDF

87.3 KB Created: 2021-08-11 03:53:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b1564a3f0aa2bbdb326958de888c7fa7 SHA-1: 0929a6b2e07243c74a0f2af74e4226b0cc79100d SHA-256: 43258a4b1b8c1376cf0f5fb1ce74ff24dd622138a5ea0b8a2d8cc6a4e7f7649b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload directories and disposable hosting sites. While no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/587c3c2a9d2ff27ff7599d0a2e335773/fakupeden.pdf In PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-5/file/bujogebexa.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d63fa4ccbd---sovosarameveduxa.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/85295741041.pdfIn PDF document text
    • http://starlightcelebre.com/clients/4/43/43e9139217482d7666ce300faf566241/File/tokigozatokizunuvuride.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/musamatamivivodab.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160898f82c7018---29239077844.pdfIn PDF document text
    • https://kueapem.com/contents//files/89538470096.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/66443062138.pdfIn PDF document text
    • https://plasy.com/uploads/file/xokisikerasozagebaruterup.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/83743816453.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/n860oo7fluer7vapr80h7ujuo3/wamuxepapowawarokabo.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/f6c0e2ee0467fb31d69fbd4fe5895a69/vazax.pdfIn PDF document text
    • https://talleresimad.com/images/subidas/files/wadebixadizozadagirinesap.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021781748377718.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/68820108171.pdfIn PDF document text
    • https://eventspicer.com/ckfinder/userfiles/files/winufenof.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077396a8a859---79002729090.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/vewonulonasajojem.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/pisuwijume.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/rokezulidugigilivuj.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/m9ddrfhqjqhcgl8bs2r2394hf5/4036251213.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/71184409.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=do+bmw+lock+automaticallyPDF 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_off0000f2ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BA 10420 bytes
SHA-256: dcc59d6aa7405274f26ea0b6f979e00150f5a7ad983cca7d4af9987e6f3afdbf
font_01_sfnt_off00010a6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6E 17324 bytes
SHA-256: 520671b70d113cb345a8296605825f2a1539ba24fb8bd4eb7fe127a85efc696c
font_02_sfnt_off000137cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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