Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c656e36c6a12671…

MALICIOUS

PDF

76.5 KB Created: 2021-09-07 19:48:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f6088af3b8b5056070cdbc984ad0dbca SHA-1: 34fd9f54d9dcc900a0a1e64cf693314ee254ea4e SHA-256: 9c656e36c6a126717230bb6468e4d9d72e87092362bb53e1ad7bd9d7c50d5848
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm for phishing or malware distribution. The presence of a link farm on disposable hosting and the use of UTM parameters further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608147be3b8a9---soxatisaravubodanogekeka.pdf In PDF document text
    • http://apcmagon.com/userfiles/13009074563.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/m61qcfethfc9iit4asph0naqt1/2999695887.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/26632592480.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/33634095457.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e34a2a8cb---goziju.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/f3e6f63d903103a9bb94ac7015c85c07/koxenilesemapuserojiwalag.pdfIn PDF document text
    • http://houselandia.ru/files/50175589910.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d9c633f943---99320463880.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/juxevubebuzabixifevu.pdfIn PDF document text
    • http://dichvutot99.com/webroot/img/files/27370118107.pdfIn PDF document text
    • https://berettyotv.hu/userfiles/files/gixutitasijufogevakuwala.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/gufazanatirawike.pdfIn PDF document text
    • http://bodymindspiritconnection.org/clients/5/53/53f1eac0d8ee32431a47b4e1af774f29/File/jabodakurulifuluwit.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/mq3lrhpoooktk0qau6b5li5juk/71393572405.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b36215e6e---fopodopenidipudo.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/bilodev.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/pagewegeru.pdfIn PDF document text
    • https://tl-systems.hu/files/files/rikazokiza.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819c6a82f81---48964228910.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/41612997417.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea0da5abde---pibemeruxiruduterimon.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca37a4487f---96805515717.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/887882eac3b974f6669abd8e1adc7eea/mutopoxupuxuwizezopakogu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=epcos+565-2+datasheet+pdfPDF 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_off0000c200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC200 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA12 19604 bytes
SHA-256: 8eee49cc05cd478bea25c1ca7ef616e179c62e866eb42752ba66d050ad16e813
font_02_sfnt_off00010b0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0C 10812 bytes
SHA-256: 9f75c0b829561a377f72e0f437976a5aa83328bab024c1cc79704f8c2fe91bde