Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e8d5c843d8cf868…

MALICIOUS

PDF

79.2 KB Created: 2021-08-20 14:05:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a0f79f412af87ad66515501423984fd4 SHA-1: 72354498ec9917f1961dbab2850f94cb33721b8a SHA-256: 1e8d5c843d8cf86851579e83c636a180fa196b71726dd3f0c4260e6ae38692a6
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and embedded URLs are consistent with a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b01f5a80380---gizumakugunemekonizux.pdf
    • https://kaemsp.org/upload/editor/file/peritowiximakaxif.pdf
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xidigogima.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1606fca4d0db24---lines.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/ba9aaf772310d06c2fe4f91d78fe7a00/35635953120.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/7a35c4efad27ff3d8a14402108afeef1/zanonawuseriguzodefujuzi.pdf
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/cf36026f7d8675e2f1f98af6e29d56e1/rarawusixisipubazefifo.pdf
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/1bf82c65c385dd08b0ea8ddb005d8c28/45845159547.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/e9cdf5209a438cd88f234ace14f426f6/puwijagir.pdf
    • http://akifkasaboglu.com/esatfisek/images_upload/files/91315576303.pdf
    • https://turismopontevedra.com/ckfinder/userfiles/files/57683564007.pdf
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/werufelelop.pdf
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/6d322e386651337f0377c313e2271910/lojozozimiridijuju.pdf
    • https://digireg.pl/upload/timotokarenogidujovab.pdf
    • https://andrejc.si/files/file/duzavozijufozil.pdf
    • https://pioneerlift.com/upfiles/editor/files/xonikore.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/0583126e162eb3c4fe84906c8e965887/wusinewodebus.pdf
    • https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/9643626880.pdf
    • http://turnyras.lt/Files/file/26581067935.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119e5b85efdb---11783910148.pdf
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/a4be290a6bebe5a8fad147ca975369bc/51131877697.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+to+take+learners+permit+test+online+in+florida
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d335.bin
98a12e9b64ab83d29b2e83911458d5fc54c09f86cbcc46599b59dc43645f0bf1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD335 16656 bytes
font_01_sfnt_off0000fe3b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3B 16792 bytes
font_02_sfnt_off00011652.bin
4e077967f7ea5cd4528061d8f470d0412379a4ca026f762ce6feffc72a3499df
pdf-font-stream PDF embedded font (sfnt) at offset 0x11652 10828 bytes