Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b785f5006347394…

MALICIOUS

PDF

73.7 KB Created: 2021-09-06 19:48:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7a681a0ee1f280c9e593100036f6de9a SHA-1: d9313e2162ac530db29fb2e0bd9435bd81f2e0c6 SHA-256: 8b785f50063473949029c854969fa641a58926fab827255613fe50e192d985bd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to numerous other PDF files hosted on compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a malicious document designed to lure users to external, potentially compromised, resources.

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://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f85fd3c527---27750199119.pdf In PDF document text
    • http://svatba-emi.com/uploads/pages/files/koxekujegajegu.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/98959451614.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/83118804075.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/94686854021.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/pegusanukumumivovowemopa.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/45786fe3923ec3bc5031f6709dad6fa5/66683620630.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/69630491713.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/6f2d26ed8c9861954361520da29cec22/kosab.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/34573882148.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/57748111077.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/58448679495.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/bolubotatulowivafovaki.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/21994175026.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608beee917142---77110582188.pdfIn PDF document text
    • http://merwepizza.com/upload/file/renijuku.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a98b1b1a4a5---37084484517.pdfIn PDF document text
    • http://upsshop.ru/ckfinder/userfiles/files/xatovejejewawilirojoze.pdfIn PDF document text
    • https://fwullong.com/upfiles/editor/files/12598330280.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/69826438811.pdfIn PDF document text
    • http://revize-elektro.info/UserFiles/File/82603703175.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd8d304933---dasuvi.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/wuxakaramokokufuwuga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=harrison+pdf+19th+editionPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD6A 16320 bytes
SHA-256: 4dfbac0c413cbbb76c00dc1e3b147e76ecc47b631e8dadfb077dc4673c7364a9
font_01_sfnt_off0000e724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE724 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3B 10760 bytes
SHA-256: 6e31104d9564cc8effaade7ac54b8ce28f6c131f668b5270fc438def6bc2dd85

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