Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dd156236c002bf0…

MALICIOUS

PDF

108.0 KB Created: 2021-07-02 23:34:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 763a70cb8c9af05eea1577a1adf49757 SHA-1: aaed6f7d15beb55710b0ae675b2b9026bb8b3fa4 SHA-256: 9dd156236c002bf03c7ee5c110bf951e386ebfaf3411a2b8e15d178871363a12
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised WordPress sites, likely to distribute further malware or phishing content. The presence of external URIs and link farm heuristics strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

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://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/b33518924822df12f5c5d2387979eb9f/46699881694.pdf
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/ded766b77d5a131c9ede5a149bd6679e/fupek.pdf
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/j5qbqa77jei1qh70c5u5hufai6/20180042544.pdf
    • http://broadmoor80.com/clients/866172/File/dufab.pdf
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5a829a02f---zapufojizabosabese.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ccfef3f3bf0---40561184208.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c87314b123---bevefopepewonozu.pdf
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/798sotang5nkfusk69sq6pj5c9/satotagezijojavotu.pdf
    • http://bachova-terapia.sk/images/file/91559868221.pdf
    • http://landmanenterprises.com/clients/6/66/660ad4be7ac834282af30b44844c6003/File/31847702617.pdf
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/da12a12c37bf441575998fa066006417/gagoraribix.pdf
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160733250ef0e1---98815610857.pdf
    • https://vandolderskb.com/images/usr/9136527503.pdf
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/o31loh2jl8q7mj9ke9jj0ji472/womewufuripe.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc260c4e9b---xixivagiritodovamidofowe.pdf
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/72f76be0f6214697c4b96355639a86ed/raxewixe.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b7778509a---xuxuwanipumirasufixa.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160875238a4d69---55140425010.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606fec4997d74---37157126056.pdf
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/955f9ca2c3d239b292dfaa44b99ce063/23067233296.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aea4b6e56cf---rasetebajalep.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/e8f6f5f800fc218e06d7a9abd0996de4/tutowi.pdf
    • https://a2designbg.com/userfiles/file/22127853747.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160b071c7d5224---98362892700.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/m02579q7f7fhudlp0tpuojjhg1/nufobusosudowinineb.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16078fd9382cea---37556166075.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160913752b792a---35369564723.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=loan+contract+template+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000144dc.bin
6c2bc42ea8b6edb811909621e9fd0129d777e02331245bb4de6b76e38f79a2dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x144DC 10476 bytes
font_01_sfnt_off00015ca9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15CA9 16792 bytes
font_02_sfnt_off000174bb.bin
d43eab6ba737814526bdd0474e18870543158e550e1f247def718d6ad80245a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x174BB 17520 bytes

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