Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ba36d35abc40985…

MALICIOUS

PDF

107.3 KB Created: 2021-07-05 22:33:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 3d5f192afdba4e90f8cc2fd56aca7a8e SHA-1: 2160823ab4373626724a4b9d042892b13e16a6d8 SHA-256: 2ba36d35abc409854019d80c2707182c964fa1a0d5beeb6ec0785b97a75ec804
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised CMS uploads and disposable hosting, indicative of a link farm designed for phishing or malware distribution. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. While no scripts were explicitly extracted, the structure and URL patterns strongly suggest an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9867

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://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/v8sioeju37opmo0rlj2bdl0a59/36917194634.pdf In PDF document text
    • http://jinanxintiandi.com/userfiles/files/xomovibonodaki.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16076b5df486d9---kujolelowatuweriwe.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e386472ce---32962105775.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210626084850.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e9d4066b7---telekujanaxazojuxaz.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da9a539544b---toziloxugerozuxapomalotam.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160e080f45ae0d---norolavozenejogig.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160beb43e61f4d---8251530504.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/pibune.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/fozijadekobibekejusa.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a40e1fc1534---31913948192.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/ee2c59f84a37e99404d528b42c6874cb/96097765459.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073aac5717db---83992744860.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/nofevuguxizobovukuregujax.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9742a7af1---zezodolikewibuz.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160822b12e0fc3---8338250534.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/birekuritexurokovuk.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abe2a6ba7a1---maladopixepatawabe.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/df27e4d9856d062fd7642f31d8cda217/wowuxopuge.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/u9u00ej9vfupg1u3jji3in8i64/sizisokanesisewiv.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/5ba27d2ccccd28412c29d3be0e08a4dc/lazokokugolazuginede.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609b841b35185---66381516968.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/2a53977bd150882b9fd6da5fc4e012a8/loduxinibebekaw.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/97qm0vgtuvbemdqqijpdff1v3n/nagut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=play+roulette+nowPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13623 3024 bytes
SHA-256: 9e9f6d7efdf1a3e2ea9eb43beb68d09291e965246c366b3d2a637c15c8ca0a67
font_01_sfnt_off00014250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14250 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015a62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A62 17752 bytes
SHA-256: 15470b2fafb5551ce5701aab15daa748448888fb39d95e02c45b2ec423c72f2e
font_03_sfnt_off000188be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x188BE 10140 bytes
SHA-256: 45c5876900e02a3e8653195509b1c4cce0ec06a8ae14c39d29a26a5cb4819732

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