Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cbdd06059e635d5…

MALICIOUS

PDF

94.8 KB Created: 2021-07-17 22:35:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c7b651387d88e60a245ad1710c80bb44 SHA-1: ccb98f9378372f639846c01b365db46a47009631 SHA-256: 1cbdd06059e635d5ceef38725379e20e8bf0bbaee0f96625696b22e55f5b125d
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs that point to compromised WordPress upload storage and other disposable hosting. These links likely serve as a distribution mechanism for further malicious payloads or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160c404f4f2f39---89665672560.pdf In PDF document text
    • https://shellserva.nl/docs/Image/file/27425268223.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8235c2baa---8209609174.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c74b6f0e02f---jupejenelofujamorurorevid.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/08b96960ce6b3700ce0c1a6c411c64a7/xigowugugegukewawitiwibu.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609eff0750834---gapimigubaxeriwonagego.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bd07909900c---47738832232.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606efd8d67eda---kevemepotipuvigafalali.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/13a86fa5e89541b2e60afe93df96e64a/kaxafesuwivaneruretolep.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086734e2daf9---51184754950.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/bj0m7276g7u8pcg10l8si8rni0/bodagojekurujo.pdfIn PDF document text
    • http://quadocdao.vn/uploads/files/43764332883.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/xebofibox.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/buxoridimupudovawusunizar.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/7cd3aa7ac2ae35daf17e1b9b39346886/wufutewidebivarenasiw.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e04b48d66a---14246282131.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cadf7201cc---96215925261.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/89440862298.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160835e613c124---71822700487.pdfIn PDF document text
    • http://galgalesh.com/userfiles/file/rujamusomolinuni.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c244ca4e004---92421484268.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=gate+probability+notesPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF992 17688 bytes
SHA-256: 8d10893e3239c411ed1e7152b10277c284ae95bc188c8c1cd83639f1aa2ede5b
font_01_sfnt_off00012836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12836 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14047 16112 bytes
SHA-256: 86fe172fa7fe529257526e13f9a7b0995eaa56380ed275a70ebfc8b59ad4398a
font_03_sfnt_off000155ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155AC 10536 bytes
SHA-256: 294a409496aec42dc4684c48ce291f84fd734f090ebc8c6032acb06bf5d20894

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