Malicious PDF — malware analysis report

Static analysis result for SHA-256 37cb7bdae35dd0d9…

MALICIOUS

PDF

69.9 KB Created: 2021-09-28 00:48:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7cd22971c8f487731d442fe20c8d9ca1 SHA-1: b6a3d2d215bec3629bc8c6ebf90c9940b069bae3 SHA-256: 37cb7bdae35dd0d996e5f942575a79bae9219b18dd3977b98bfe56bd62463c41
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics as containing a link farm, with several URLs pointing to compromised WordPress sites or disposable hosting. ClamAV detected it as 'Pdf.Phishing.Trojan'. While no scripts were explicitly extracted, the presence of numerous external links and the ML classifier's high confidence suggest a malicious intent to redirect users, likely as part of a phishing campaign or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://afraitn.com/basefile/afra/files/40398537869.pdf In PDF document text
    • https://www.allduniv.ac.in/ckfinder/userfiles/files/difudufosug.pdfIn PDF document text
    • http://qualityfirstservices.pro/testingsites/advantage_aviation/assets/media/file/70767984054.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/92966545612.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/3d92e93a59b143a31bf659a460e66745/98676873082.pdfIn PDF document text
    • http://tottazo.com/userfiles/file/bapamalezem.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/simalutatov.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/df0afd326d0b9c26e48be9d448c1add9/gakimunevipezatojipom.pdfIn PDF document text
    • http://taihegas.com/filespath/files/20210905044452.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/sevuzeke.pdfIn PDF document text
    • http://restaurant-lyons.fr/userfiles/file/63289228689.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/sudunitenet.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/sejeme.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/tefene.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/161513f499732e---91020179224.pdfIn PDF document text
    • https://pianotuningdarwin.com/userfiles/files/15380476399.pdfIn PDF document text
    • https://ladida.asia/sporlegen/administrator/imagetempfile/diwepemefeliz.pdfIn PDF document text
    • https://alebusph.centralcms.cloud/galeria/files/guxopumemimijijegol.pdfIn PDF document text
    • https://bisleriwheel.genefied.co/ckfinder/userfiles/files/40847300678.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/86600870161.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/zukux.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/9dvuroeu0438hs9t95vfqr6p97/vugibuzogotosisezivogiz.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/81915720426.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/16472a108c23130939217c1ef4e6b221/vojijekepetute.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/72627945367.pdfIn PDF document text
    • https://swapnauraan.com/ckfinder/userfiles/files/84727447651.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=ultimate+alliance+3+co+opPDF 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_off0000b4f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4F4 10448 bytes
SHA-256: 8dc1a196bf173af06a178a376e8739789afd1e4ceacbe3f087a837daacd1b639
font_01_sfnt_off0000cca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e4b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B3 14936 bytes
SHA-256: 949e13f7d63e7c575f036e051b0aeb7f80463e6bb7bc518eda08be8f3e75d61e

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