Malicious PDF — malware analysis report

Static analysis result for SHA-256 892a7e5f28f3b471…

MALICIOUS

PDF

83.1 KB Created: 2021-09-07 02:25:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 60510cc8ae15bc934525ad4604a75514 SHA-1: 892fd0bde921cb27bd67c8c4c548f8d3190c896d SHA-256: 892a7e5f28f3b4710d5fd351d4c1a4c4a1160e08ee5e9d8c490d8ef4b8c93ce4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm for SEO manipulation or to host further malicious content. The presence of external URI heuristics and the compromised CMS upload link farm indicate a pattern of redirecting users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://weilaimachinery.com/userfiles/files/97583958158.pdf In PDF document text
    • http://www.pranabkumar.com/fckimages/file/36532261864.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/14vjgrls4a07r1ics1do2soodt/42157631576.pdfIn PDF document text
    • http://geose.ru/userfiles/file/vogozudokelarekananux.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/72414651510.pdfIn PDF document text
    • https://aashianarealty.com/file/busilelafujiwogexuf.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9217be41e5---4257247448.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/75001322953.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/161325c45e7fbb---19079444413.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/tuzisag.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/21149899945.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/famobezatorugatif.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e63ed10566---44084997976.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/35221603652.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/43302019633.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076445c39a56---mejakeve.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160d8368dac2a3---jinutedazupasevitidul.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/jagike.pdfIn PDF document text
    • http://friulanamarmi.it/images/file/46596389576.pdfIn PDF document text
    • https://digireg.nu/upload/77743131766.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8375b0e0a9---mubada.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/11074167356.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/02375g44tsmjcqhon8ns3keoh8/96700157262.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/mugakovanaratekibejuzuze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=electric+pallet+jack+training+manualPDF link annotation
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/texijeripedubo.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_off0000e217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE217 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2E 10732 bytes
SHA-256: 922a2099625d0f8033bf743090a80fbe8ee88d9abc69f1f8e3e2a88975dbdaf1
font_02_sfnt_off000112c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C0 17128 bytes
SHA-256: 65ae4c706ab3787790919e0e129eb0bf02b048f33a2a0e4add1785bd68c72174

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