Malicious PDF — malware analysis report

Static analysis result for SHA-256 73b0a4130c1ef497…

MALICIOUS

PDF

77.3 KB Created: 2021-10-09 14:26:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: bf3ec7605d32fe5e2a0c6c2ae60e3d2a SHA-1: 4fb07de24bd7994f2c4a6dc54e19cac44a6c202d SHA-256: 73b0a4130c1ef49747a440238a082f68ccc1dadef7725758af1fc055864bcba5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting it functions as a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://huntic.ru/uplcv?utm_term=greeting+letter+in+english PDF link annotation
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615a890ef3a11---sulomisonubijafirubi.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/17353cfdb82e6493c1b64305e8c98ddc/pofuxagalipukefewixa.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/96185542640.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/kubixesiz.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/65612814079.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/kujugazimarisozug.pdfIn PDF document text
    • https://ever-progress.dacola.com/upload/files/57085671593.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/4805713536.pdfIn PDF document text
    • http://radio-salsa.fr/php/rs/filesupload/file/59958199850.pdfIn PDF document text
    • http://www.vnos.vn/app/webroot/uploads/files/3890149859.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1615159b42cf78---juxaridepiw.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021090918024859.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161597e9db35ab---26345889231.pdfIn PDF document text
    • https://lalicorne-hotel.com/userfiles/file/zumotowizavitemepob.pdfIn PDF document text
    • https://kiofruits.com/admin/uploads/files/piparavagogonipujexipaf.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf48a405b3---920682642.pdfIn PDF document text
    • http://gaytonfa.com/upload/files/dolemuweferabekoxeka.pdfIn PDF document text
    • https://crc.creativechange.net/ckfinder/userfiles/files/dotasirolat.pdfIn PDF document text
    • http://registermycompany.in/admin/userfiles/file/xizefemubozisilurate.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/88cae6a7dd7afe8696a7c886c412655a/76941706917.pdfIn PDF document text
    • https://un7un9b3rl1pa7-99.com/contents/files/34132686460.pdfIn PDF document text
    • http://websteravelandscaping.com/editorData/file/bawuwuzunido.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/81964851535.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/sitipipurapafevelusuk.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/161431c99b4320---bifisodanakufedokiz.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_off0000cc27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE439 17344 bytes
SHA-256: b032db7f353e8a34a89e04e22b93c84023fb03bd2225bbd756ad6cf9cda1bf35
font_02_sfnt_off000110de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110DE 10144 bytes
SHA-256: b10368568ba04fad6c058c1a595e57bcbae068b0b647c6084380cfd52edf53c0

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