Malicious PDF — malware analysis report

Static analysis result for SHA-256 1254e45d16a75097…

MALICIOUS

PDF

82.2 KB Created: 2021-09-01 10:23:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f289e6051fe5c3e90fa66662fd744e8a SHA-1: cb234a1eba888d849ae7c74a1cf1a050e8f2e7e3 SHA-256: 1254e45d16a7509795eb5bb2b2d97f754380bac54b7add206a33e4116141ecaa
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many of which point to compromised WordPress sites. The ML classifier strongly indicated maliciousness, and the link farm structure suggests an attempt to lure users to external resources. The document body is heavily obfuscated and unreadable, providing no further context on the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

Heuristics 5

  • 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://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c661604c2---rexapabigowal.pdf In PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7ec4eb9fd5---ragilogazetediteki.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/36299458486.pdfIn PDF document text
    • https://taptigrihnirman.com/singhania/downloads/file/tajawukoj.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160f08cb25aff7---98996386955.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/elq4f16lnj3fpvpfs8fi02aeu6/61653412867.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/6983701aa1e01fa7c59d0b8089b628db/97815369289.pdfIn PDF document text
    • http://anapharmata.hu/ckfinder/core/connector/php/files/16842509770.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/lotamunevaxijifanotufi.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf67ed9b9b---muvunederujodikonemupo.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f594a66387---92411976018.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/e2585e3c9240c861c9f14da9a9b0f50c/karoz.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/jizovotilipuka.pdfIn PDF document text
    • http://jp-cable.com/d/files/jafirijirokajesutotatavo.pdfIn PDF document text
    • http://tieclangman.com/Images_upload/files/78773085697.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/kufowiburasonaze.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/64f36d63648160bee45b4bcda82cdb66/83558078664.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/1593597409.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/toxiniromubaboripamupa.pdfIn PDF document text
    • http://budka39.ru/files/pabukala.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/73162185451.pdfIn PDF document text
    • http://seja.lv/assets/ckfinder/core/connector/php/uploads/files/texemalemuzuvemonabid.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/ac57a1abdd8162d854b33f89f95ceb45/kotidurowuju.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2af8271660---94012422095.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/keveketibufifesase.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=vegetables+you+can+sautePDF 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_off0000db52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB52 17912 bytes
SHA-256: 5a71966a9421fe36795eed36013131206999c39d6431866e1499e40e5d58b795
font_01_sfnt_off000109c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121DA 10536 bytes
SHA-256: 18167af968c622a78479d25c4fab4415e89606a15c13afd437bcfc69a4cca1b6