Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1bcbdda95e6c1f5…

MALICIOUS

PDF

88.4 KB Created: 2021-08-04 01:52:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f98d86b0b340e28ae67dd00b43d00f12 SHA-1: 84006735048fbf251760eb8d01d3b80ce0d67783 SHA-256: f1bcbdda95e6c1f5690f7fa6163a3302348e3b3ea75642da4d380aca655d2f13
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS uploads and disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or download further payloads. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://knshzj.com/CKEdit/upload/files/67834663785.pdf In PDF document text
    • http://e-park.es/img/uploads/files/28808300801.pdfIn PDF document text
    • http://hopsch.de/uploads/file/14188606149.pdfIn PDF document text
    • http://kanomax-nsk.ru/images/7693129786.pdfIn PDF document text
    • http://klinok-saintp.ru/files/40257780314.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/lbdg7tu3kmp0tcv803nq0u2ct5/75935282443.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/16b09b530c32620d7cb230dde180dfa0/79625286818.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100795e39a6c---32579186168.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/69358585131.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0dfbe83ed---36009436462.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c8fd092959d---neloxad.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/11852809533.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/fatibekiwowezamumevomilex.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f933eb7570---mesizaloragiketise.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/n6mar6rqinhq25rnpongsrpuf7/81699365926.pdfIn PDF document text
    • https://agape4u.org/userfiles/file/44315670915.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/u7394ut3bknh3lljj0qgcgr1im/dibepolaxipajivivi.pdfIn PDF document text
    • http://dsagco.com/Upload/file/5054856192.pdfIn PDF document text
    • http://bona-agra.pl/Upload/file/52615864511.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/xezok.pdfIn PDF document text
    • http://ventmetal.ru/userfiles/files/wutumefenumomebebisago.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/makovusum.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/koierv0impgs9gcev29tmg21lk/sunogotojerivij.pdfIn PDF document text
    • http://carefirstwalkathon.com/clients/8/89/89514deb4c0e8807eb046cac28c4977f/File/jumimalanopokoravavato.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/l6kmgea2le38m2hhipv05ibpfv/66763293621.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=what+are+the+responsibilities+of+admin+managerPDF 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_off0000f5af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AF 11076 bytes
SHA-256: e237e43e0c521ffed36d6f29c18a85b35e4b967ce86e44872409fbf05c34d95c
font_01_sfnt_off00010ed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED9 16748 bytes
SHA-256: e711201e9fbeb8ebd85c609e4fad2e29b3fdf284e9d2fd7b063b65fbf8934d0c
font_02_sfnt_off00013a5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1