Malicious PDF — malware analysis report

Static analysis result for SHA-256 99d96a7251788cff…

MALICIOUS

PDF

84.6 KB Created: 2021-06-30 13:44:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a3f2b5a8ab8a89c2a448329bf6084bc5 SHA-1: ca5fd47c81b03b54ca644fc4ba2b20627b16d9e3 SHA-256: 99d96a7251788cffb4bc14a0b3c834f7d33a8f1baa83ab07cf16eeafa880b6dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://cometsecurity.in/admin/userfiles/file/nazazowusojilutujab.pdf
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/vujefuduluw.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160d3cce58fc1a---21926144526.pdf
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/cpkftn58m0ol53vq46komfprb4/fevenezumebu.pdf
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/3fdffacc5857c7630ce7e5c71b3c571a/liseno.pdf
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a346f751d9---ralinizaxet.pdf
    • http://esoftland.com/userfiles/file/26541609205.pdf
    • http://cymrozgreatdanes.com/clients/1/1a/1a407d8ccac5525c71aaafb6b4664123/File/18497680758.pdf
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/c4580a5f809257ddb24d9bf28e92a5ac/71435294171.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a73a749419b---zofaz.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/9e4551982ee6009f9001370105232e65/wufojigi.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/rbhj7r46fkcgrn1q265grnmttd/tuwobuvufozipidoboxopazij.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160851a7c11cfc---21880786245.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/fjqh3cdligks88dubg9t2rir9l/letebolefixikoviboxo.pdf
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/a213c57df407db10894b97d25d2db69d/jabavub.pdf
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f08ba57696---josufir.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/fc043bbf7ba69eddabd9e466eb98becf/50351201341.pdf
    • http://rund.cz/UserFiles/File/41580965073.pdf
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/502ecdf220c1e2e36ff92322227bbec4/86728151979.pdf
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/7vt7gce5pr3i08bgr8kdue0qbv/23739803831.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16071216e636c1---pinef.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/vhgo2oot2lbsvop7153lm94nqv/75041343348.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=levels+of+spelling
    • 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_off0000e9b3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B3 16792 bytes
font_01_sfnt_off000101c5.bin
fe97a80f1f7415c43d7b7503a9a36785930df387be2cc2abe7fe9d9fded635df
pdf-font-stream PDF embedded font (sfnt) at offset 0x101C5 17096 bytes
font_02_sfnt_off00012e7c.bin
e4f705520dbb70ab90094a39436da8b746371a83f49c252c9de491b8f534caf1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E7C 10196 bytes