Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f81daa7c6ecebcc…

MALICIOUS

PDF

80.4 KB Created: 2021-08-01 08:48:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1b146d9dd346dd1ea565440eeff1eb1d SHA-1: fcc66dc72d2353b3a7c0e2d427a86fa8049a3470 SHA-256: 1f81daa7c6ecebcc38eed5acac7b1e678518be30c07b24bf5e18f23377306cdc
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple URLs point to compromised WordPress sites, suggesting an attempt to lure users to malicious content. The presence of numerous links on disposable hosting further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/a11qv0v9ob9jeeniefuhf20vdf/11384120827.pdf In PDF document text
    • http://lamorenj.com/userfiles/files/7860684171.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dda24b27529---61805971833.pdfIn PDF document text
    • http://rc-modeller.se/images/file///nomefubidujejuguzap.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/29ccb698e2fb7b09d8190e9b16a150e7/90171153373.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/14686900412.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e99cbb3a2c---diwefexotaxuvetiz.pdfIn PDF document text
    • http://goref.ru/files/file/wimudil.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/c6a6c13e46c8a875acb9545a9d7a0653/zunirafejularakafivuwija.pdfIn PDF document text
    • http://zerosquareonline.com/file/13809372796.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/1759cibn1uqiqo7j8es951o0dn/nuxinifejofixu.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/cfd4c388f6a5ccebcb4b787cc25cdd8e/23781469354.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f7da9a7b3---bazomejazabebewitetuluv.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc8edbf6ad---vosum.pdfIn PDF document text
    • https://ski-experience-japan.com/images/blog//file/91896232177.pdfIn PDF document text
    • http://mosjob.ru/images/file/39497473366.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/wezeteguwafikapisasavenup.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/95616496090.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/71368155053.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a656d02928---84182437884.pdfIn PDF document text
    • http://www.rannatennis.ee/data/upfiles/files/fubusamipanogizekasodo.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/7f61d2bfc5ce392165ef7769e93cc335/28320368231.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=complex+sentences+worksheet+grade+6+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_off0000d46c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD46C 16808 bytes
SHA-256: cb14205339e3326552e534240cd190a6ecfaa7b3f4f96c1c6aeebd3bc4721871
font_01_sfnt_off0000fffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11813 11456 bytes
SHA-256: 03fa8123171a9b35dbd0beb746c337aebb8ac35fd935486f19d180fa05c7aa25

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