Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2db552d7a808a07…

MALICIOUS

PDF

156.2 KB Created: 2021-07-07 20:47:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ddbf2657c181c7389075f8ee8b8f0f3b SHA-1: 7790fba25261b9f7fb9e4c789b545add390f728c SHA-256: c2db552d7a808a07a1ade36a247e674a84d0dc908b38127592b9b6f972fa718e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9834

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://drafthe.ru/uplcv?utm_term=corporate+governance+chapter+pdf PDF link annotation
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf96ff7e390---17268019640.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/b0134dd946ab25fb43c92fc1029e4fee/fisoju.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/rageligotabe.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6303aa889---sufajemewenowetej.pdfIn PDF document text
    • http://phongkhamducphuc.net/images/files/keganomivite.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///bapogo.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b98a5c18f7c---fezisisum.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/68366320170.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/069c1b48f90c3243bb9fb5b95b3c1820/peledupurokif.pdfIn PDF document text
    • http://fairway.cc/images/blog//file/21303342168.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/cce0lb6hhja2ba7ss72j4vmjt3/79942417187.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/89222011270.pdfIn PDF document text
    • http://lblussana.it/images/file/74962279617.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/771f228a8e83e5c17d08ea1fa6d934f6/24567897538.pdfIn PDF document text
    • http://ithaca1966.com/clients/8/85/85e9e0a76fddb83d7689cebc6ab07fae/File/67482213061.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609239fdd1ca5---bamigosezejerevu.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160770fbe3554f---82818180113.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7f8fb5f26---86443523018.pdfIn PDF document text
    • http://cameradungphat.com/uploads/files/81137131795.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160905ecae7555---64492217652.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160afd90460c0c---61875805900.pdfIn PDF document text
    • http://novichiha.ru/pic/file/79618118039.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001f85f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F85F 10692 bytes
SHA-256: f4eb9977e60cfb4116e7247fd6bb61afffb5615529e84a6852293e047b635983
font_01_sfnt_off000210a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x210A8 1976 bytes
SHA-256: 36bb1a44b54724204cbfcdfaf7c11a447e235259e6ca6fe62b33397b475d6f46
font_02_sfnt_off000219c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x219C2 19092 bytes
SHA-256: 686f666e03df9de93ae94a16de3fa417065b40902190aacca27595c38bd01883
font_03_sfnt_off00024aa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24AA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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