Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbd883141b9b21e9…

MALICIOUS

PDF

87.0 KB Created: 2021-09-05 22:07:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c6949b73cf820886233d486fdbcf779b SHA-1: 0b2b21caf0eaad3cea0dc543247ee4fccbb0852d SHA-256: bbd883141b9b21e955df76eeea99862d08401c0abfd9dc2d427b6db9448cc6f4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple distinct hosts, many of which appear to be compromised WordPress installations or disposable hosting. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest it is designed to lure users to external sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/d0933e05984627c90676f5dabca00df5/zilatubuwovalogos.pdf In PDF document text
    • http://splogservice.ru/content/file/19502418000.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/vuweva.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/a119199b10a0511499cee4164443013e/xenapisu.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/fe50b33c5f3104b72b9acdff57fc646f/pasuvafisuxodosim.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16089faae26a96---lokomonowilot.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6c6707d4b---gatesudisejusijizubamuse.pdfIn PDF document text
    • http://epplast.com/files/file/64630103188.pdfIn PDF document text
    • https://afayl.com/userfiles/file/gefosikunojetigu.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/bbafcabb065742709c37c2eff882ec9f/dakuxumuvurobogose.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/62275848047.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/rtmvkh11lbmb0dsur4hi54qf8b/73262834651.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/30d260cb0e81927254e794f2cfb8444f/nirafozipaxag.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/03b71700f0752824d9d094a01acdc944/bogifugoxorovo.pdfIn PDF document text
    • https://adikkedua.com/contents//files/61112365097.pdfIn PDF document text
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/tnde2vbevvb1n12j2988aeikn5/ravupuvaniju.pdfIn PDF document text
    • http://profesniprukaz.cz/ckfinder/userfiles/files/17544912201.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105d8c6cf076---jutasigubabolisolurawumak.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/27579254296.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f85445a66c---6673589908.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/bffdecad40e48babf3274826a64d76a6/44307980587.pdfIn PDF document text
    • http://innersolutions-uk.com/file/9704099068.pdfIn PDF document text
    • http://letdentalab.com/img/files/92341338326.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=instalaciones+de+ganado+bovino+lechero+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_off0000ecc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC6 11056 bytes
SHA-256: 31801ff6283f32d87d25f36dbdc14a450a4f270d9a9dd3175fa6d3bcf03561de
font_01_sfnt_off00010604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10604 18792 bytes
SHA-256: bd229c7a7e6dd5638a9b3700a59f39ef046dc9c575138cc0a2aa3bf4dfa232d0
font_02_sfnt_off00013603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13603 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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