Malicious PDF — malware analysis report

Static analysis result for SHA-256 f37d055061b1f80f…

MALICIOUS

PDF

89.1 KB Created: 2021-07-30 09:15:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 94ee06177cabd37d8678b3ffe7b0f86a SHA-1: 25c7f654ad39b2592b3d06b50f34fde8b36c20e3 SHA-256: f37d055061b1f80f2405edf21b6e645ad0c4ac8242f41e49345a2a71d29639df
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised websites, many of which are hosted on disposable domains or WordPress upload directories, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the nature of the links and the PDF format suggest it could be used to exploit PDF vulnerabilities or redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://medvor.ru/uplcv?utm_term=reading+comprehension+test+with+answers+for+grade+9 PDF link annotation
    • http://turinhotelcompany.com/userfiles/files/bixotag.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/c82a6dd0a80785da5e2ca86405e65d12/wusazadevojedeso.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c8da2a16139---zulifirojusawo.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/nokabidurupipopuf.pdfIn PDF document text
    • http://clubchic.lv/c/i/files/94005623793.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb26723730---21277278020.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/7vf4piss5qfu3c4j3bpilq08gb/20253685551.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c69ed49d3bd---vepenokesafivej.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/sujufofib.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/xoxebaximijevurejazovaw.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/ddce567bd5d88aa8f6ceb88bf1f04c58/nuvixiluvegelimesot.pdfIn PDF document text
    • http://autothudo.vn/upload/fck/file/gisegepogulinevijit.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/c6fffa3e399f7c83acdf1434795c7fc0/wibufiwolugefed.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608503767d364---ruvitumexopelosu.pdfIn PDF document text
    • https://cantarefides.ro/admin/userfiles/file/67471779619.pdfIn PDF document text
    • https://vvpta-irvine.org/userfiles/file/nozuwetelipoxumesodopedi.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/durorugasisuzawevamube.pdfIn PDF document text
    • http://dharmapremipariwar.org/userfiles/file/95065528520.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b503b3b36---94009659396.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/85990194706.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cde2cdd8d84---91576855446.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090964b0f5bd---rofebujefube.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/68708245272.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/5a1a1224bf506ba8dc0bf3d7717c8708/40770922147.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_off0000f45d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45D 11320 bytes
SHA-256: ea997b4b1e629a1730b72e086dcac276e53a572a26f6e260009e48f0735cf36b
font_01_sfnt_off00010ea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B5 17496 bytes
SHA-256: b769771462b91c1ef4e795864d286b4b186e7b436a0e327c95792b6690e5285a

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