Malicious PDF — malware analysis report

Static analysis result for SHA-256 d39d38bc80f9387c…

MALICIOUS

PDF

81.8 KB Created: 2021-07-05 16:47:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 21d6903168683cf0cb970acae221e8ad SHA-1: 5bea7e90c33872d6d3b2927a2b847632d97fa048 SHA-256: d39d38bc80f9387cf6f0a09df27d1b6de48783efabb09b9c317dd6f3dc12b435
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. Heuristics indicate it functions as a link farm, pointing to numerous URLs hosted on compromised CMS uploads and disposable domains. The primary purpose appears to be directing users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/uh7gk37mfif1bq37ipvijla1l6/doxizegefefafev.pdf
    • https://a2designbg.com/userfiles/file/4999561286.pdf
    • https://triptoboloyfoundation.org/editorsfiles/files/6685837804.pdf
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/96818ad38682d95e871fef7d14832602/78383410260.pdf
    • http://malverne69.com/clients/a/a7/a743c233813d1a1dbf5c38c484d85cdc/File/menilobalidimivapega.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608802e30d085---kovigadetumomovibelis.pdf
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/757c9ebc9a959f256edef81305c53588/19672110880.pdf
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/38772424955ac3a139555ced70e2673e/judokonik.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160892e7bd50b7---91498496953.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16097c3c8a047b---20001321183.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a72290c8fd0---19974603679.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1606d877663b72---61322162762.pdf
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160affd158a3bf---vubumukimi.pdf
    • https://eletvital.hu/uploads/files/xejetaxosogexisovogipedo.pdf
    • https://healthmatters.me/userfiles/file/38209750665.pdf
    • http://aep-tc.com/cache/fck_files/file/36536633524.pdf
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/qg49gnietoh6nu0s1dm8dgunt0/jabefudajepa.pdf
    • http://www.ecostroyservis.ru/File/xojojowubap.pdf
    • https://tl-systems.hu/files/files/dozevamoviza.pdf
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/66f77220ca7335113cedd5e5390a6694/49792861747.pdf
    • http://inspirationforexcellence.com/clients/66491/File/27935665005.pdf
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/37c2a6a36cbadbdf1cf3e606f3aa685e/80367900934.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/4162065b2901b239170143260c6b526e/xazuzudivejerazore.pdf
    • http://instant-image.net/UserFiles/Site/File/bepogupoxaxobukaja.pdf
    • https://alice-immo.com/userfiles/file/pozunimesalaro.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9a02b27c0---85739605208.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a80af877463---pegimuvosotig.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=early+marriage+in+ethiopia+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_off0000dbc4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC4 16792 bytes
font_01_sfnt_off0000f3db.bin
98194da5df3ca8608a730673fc537e4ac0008dbfcb05d19768a7ab2c36895dc3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DB 10876 bytes
font_02_sfnt_off00010c84.bin
ee8e8e2823a1bc792278f4762f6f32dc474fe8b47ba4fcb81751ed22cf82754d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C84 17428 bytes

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