Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7b872d4179e1fdc…

MALICIOUS

PDF

82.4 KB Created: 2021-06-21 18:25:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a546da2fd321945be8385fee4236ad5 SHA-1: ba0fcdf60d8d965da210a980df446476e642ae78 SHA-256: c7b872d4179e1fdca962faa1138e37f0c1f863f9a8262307042d73006740bee7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links pointing to compromised CMS upload storage and disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing lure, likely attempting to redirect the user to a malicious site for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://smidgel.ru/uplcv?utm_term=tequila+notes+for+alto+sax
    • https://augsburger-dartliga.de/uploads/file/64174066631.pdf
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/fgtvjug5u84c29vncj85bc3pq3/15366388509.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609435bb87177---wifidufotavoz.pdf
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/5b9be0c90cf6f8c4c5097d3a38fdaba5/vapabosejazonesi.pdf
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/0ef05cb0c5bc6e6a52c87e430cf93198/wefef.pdf
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d20f2b4705---47584563985.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16092960cd40b1---nisir.pdf
    • http://komputerzagrosze.pl/userfiles/file/6581997290.pdf
    • https://blsautomation.com/ckfinder/userfiles/files/25177807947.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d965522bf---2344114916.pdf
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a90eb9ba995---6934858572.pdf
    • https://www.explosivo.gr/wp-content/plugins/super-forms/uploads/php/files/d69bbbcb6658c629a221f83287391a99/34819504725.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c5906fd7a5a---12507350901.pdf
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/af30f093a51dc2c0fcc217914a923c25/62699932005.pdf
    • https://keluargamimpi2.com/contents//files/14145178058.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/8b2bab8141f5f650323e0c51501c9e91/80003869584.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL
    • 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_off0000eb21.bin
f8bae068f178908abdb7d0025886882f0ff0520eef85803e85211ad44fc32179
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB21 4904 bytes
font_01_sfnt_off0000fbe4.bin
80a0f6ad18f990b031e446fb2761873500362a7bc46d89c3f1a00bffe7a37b77
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE4 12328 bytes
font_02_sfnt_off00012635.bin
15a68420f1c377824b8c1fd571ac7c30556db1b4bc05006bf44ec3f6c6c83208
pdf-font-stream PDF embedded font (sfnt) at offset 0x12635 16120 bytes