Malicious PDF — malware analysis report

Static analysis result for SHA-256 daa9d83c8bf966d0…

MALICIOUS

PDF

72.7 KB Created: 2021-09-06 20:06:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3f7aca64342abfad52a2db32beb6d6f6 SHA-1: d0a99aa018cf2e262349d6a307fc505e7e441b23 SHA-256: daa9d83c8bf966d0b51c4e54a539a6af6ddecb147821322205e82f5a69fadb4e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by multiple heuristics and an ML classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm or redirection mechanism. The presence of embedded URLs and the nature of the heuristics indicate an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://crewmak.ru/uplcv?utm_term=halwa+recipe+in+tamil+pdf PDF link annotation
    • https://pmms-online.com/assets/file/30205731713.pdfIn PDF document text
    • http://sdds.be/userfiles/file/seniwabububenoxebaxiz.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/85553826187.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/70942614262.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/94056685018.pdfIn PDF document text
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/pqssveao10u8mjd1a2go6qlm94/30722735084.pdfIn PDF document text
    • https://palet-school.com/files/files/jejunor.pdfIn PDF document text
    • http://atek-ent.com/upload/file/12662967672.pdfIn PDF document text
    • http://bellsazshihtzu.com/clients/878694/File/75346323269.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160705e8090081---245967050.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/4d16a517974dc0d552581f66d6334e3d/xiduwenatixupimu.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210901_D06AA63BC3072DF5.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/dopalitabinibotedobo.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/96db86abf5564c2ecee1c7573d9c71e6/21128776922.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/66787282956.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed5b91ddc9---sorajarafaxe.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/zufajitafufi.pdfIn PDF document text
    • http://samilove-payitforward.com/clients/f/f9/f9b0b202ed5d2cb263a89f8a9bd08a94/File/83896897692.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/a218dd0082c9f23542220f283f4fb39b/xivitegi.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/3cb005ae98a9e9871a5c19d7f8902d63/28982828481.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/d60dee4619ea225aba23321d5f26ff5c/67987489834.pdfIn PDF document text
    • http://taskentcompany.com/userfiles/file/gejumefamebaramazosi.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/93716466765.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b128e0e69ff---wodubanigul.pdfIn PDF document text
    • http://geotersrl.it/file/45956692780.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/04ab5f7f67208b52b8ce10e7f2a6967c/dopasunokukudivu.pdfIn PDF document text
    • 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_off0000b7e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7E3 10572 bytes
SHA-256: 5dd177ce3f9c298f71f48dfd77d33464b3b659a7ead32871cefbb7ce95d48ee4
font_01_sfnt_off0000cff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF2 17972 bytes
SHA-256: 4a04e3439255ea55f6d2d6dbcbe4454ac049f962f9c82ed582b861f632cd6e22
font_02_sfnt_off0000fcaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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