Malicious PDF — malware analysis report

Static analysis result for SHA-256 76bdb11959e67fef…

MALICIOUS

PDF

84.7 KB Created: 2021-06-29 10:16:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cfae36b948676e2ec03fa5a872cde0c3 SHA-1: c4a3dabc9a351bdcdb70c6b2cae68d48d7e619b8 SHA-256: 76bdb11959e67fef33a21dbaf08e9045383c09a6d30847368e0962078e340c80
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or conduct phishing. The PDF itself does not contain readable text, but the heuristics indicate a deliberate structure for hosting numerous links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c61c978d54---nawaxonizifimotatipinopu.pdf
    • http://naucseto.cz/storage/47335037630.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/27714943a15f758b1fada4f3c63ef23a/10260470851.pdf
    • https://vivaldiroberto.com/img/files/mediafiles/file/vipuliwitadibuvok.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/4da316e4efd0fc37830aaf6921e1f3bd/watufopor.pdf
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/6osmudaje54qjv6isv2li2qehu/53514778724.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160799d5832d58---xofefibalozijilapide.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607d76da9e933---5803348063.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160992837a66cc---41370170142.pdf
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/mmvm6v79ce4k4toangp2mhmfds/gigur.pdf
    • http://elm3rad.com/file/27417298754.pdf
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/1podvig4o2ki64g59o4d8netd9/42697852057.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608075791d056---61734072068.pdf
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/52c58c2b96a67b7633bcdbecfe31ef9c/jaxalubejegul.pdf
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/j1hqrpsdmll63dgoeu12fn19oc/palijakezitogupox.pdf
    • http://allycatering.com/userfiles/56835684986.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7999caeec2---zejadibur.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbf936a171---99855849449.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/mjkpv16vpob7v9ntcnu0vfuert/72517482024.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba0ad9701c---76869100210.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b643d1807d8---titulimewawewigodopef.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1ddd58e00---piserogebuwutonunotenoto.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c80d9c19e1---dapepujovawotabaxadozuk.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b069387f5aa---vosugepowazo.pdf
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/563a3ee5295cc33a2e9557a93d10266c/damizanologigumufo.pdf
    • https://chauphongasia.com/wp-content/plugins/super-forms/uploads/php/files/kk69vga85qp366gv62rjfsspe1/zaxugatosafi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=fifth+element+crossword+puzzle
    • 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_off0000e5df.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DF 16792 bytes
font_01_sfnt_off0000fdf6.bin
a74b75411c04534975aef333bfe3dc96e636cf5ffa13e2a11b340dd44a0b5af1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF6 10948 bytes
font_02_sfnt_off00011731.bin
a30063737f72fc11dc74904ce4fadf186f15f8e3dd0e8d5ba694bd33bec13026
pdf-font-stream PDF embedded font (sfnt) at offset 0x11731 17512 bytes