Malicious PDF — malware analysis report

Static analysis result for SHA-256 31f0b3e304c0645a…

MALICIOUS

PDF

74.0 KB Created: 2021-06-29 22:30:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: bef3e69c08184418994267565b6051be SHA-1: efccbdfa235f61c7c3caac5f4cf89083cd87254d SHA-256: 31f0b3e304c0645a39bd69a7ed99d63e40b20877c037a45d44e58b172de3f5cd
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous URLs, many of which point to compromised WordPress sites hosting PDF files, suggesting a link farm designed to redirect users. The presence of these links and the overall structure indicate an attempt to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d50276d8df---nuselotatomobafekoneno.pdf In PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/64545702298.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/17667d4607af3da7c07f8331c9750c85/xibuzotupejejipogivuwumuf.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/moranuxenafukaduneke.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/83541649649.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/r62ib04bk34h3h9eiat9rc526h/38981044316.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/65e255cf549899c07451c74bcd19a893/gopiwenekukufe.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/ccu5ae7a8vtr5cfkhokhcnfmh0/junatajasusarodade.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/dexegiguz.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/160778c3bbd25c---75108894758.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6dab844134---tofisomig.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/tokisanewotodovuzupoz.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160c3300858c82---71600987600.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088534edc25d---nebozumipebebarumo.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/d74p532do8pudgsqkr338p2sg3/31261735147.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d826d04fc---dazurovogib.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/m7nb6kdgc9iblkqscvo5qjnvcb/bosubalu.pdfIn PDF document text
    • http://e-hematologica.com/users//file/45105810610.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/7a7grh62gsfdmsm2cbc7vmps1k/30343519345.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/72d1c44861f1fe54583daaeb6cbfc18b/93142872921.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160751da072a00---dunipitepovimut.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c80a9e719---vewukudesojugobunewub.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/sipadobevemijizur.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/b1d32561ae2271fbd560807481288608/14691472390.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=crabtree+well+drillingPDF 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_off0000bff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFF9 10392 bytes
SHA-256: 9cfa244ffcb730d293ba6d50617e29b67f58f22dfda8a2879baba908ab54b6fa
font_01_sfnt_off0000d76d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD76D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7F 16660 bytes
SHA-256: 77e3766232bcc490ca9bbfeba752396602a2b2f88ea506d1d252e994ffb22785

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