Malicious PDF — malware analysis report

Static analysis result for SHA-256 08ddac02487f7de4…

MALICIOUS

PDF

89.5 KB Created: 2021-09-05 20:48:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e369e52d7cb830728f3dffabacc5f28f SHA-1: 037a2d4bd9fba0af1097d68fe335f572bbb15cc9 SHA-256: 08ddac02487f7de42551a07e24f3c0f1c822d9d58a2bff6e8819beaa513412f7
156 Risk Score

Malware Insights

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

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, containing numerous URLs pointing to compromised websites, likely to facilitate phishing attacks or distribute further malware. The presence of external URIs and link farm heuristics strongly suggests this document is part of a larger malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://philabc.ru/uplcv?utm_term=konka+lcd+tv+user+manual PDF link annotation
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a58a016a741---jivuvamowojiridewo.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/c2d5a330a8d4e801fe062e282a285234/40219170509.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/llqdvnrh1orspg7hcalfq498ff/47120275332.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/46ikgi40u21g4eqbk7vnp4n9ac/29643795647.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/v2bqg36bsmbe8rknrh2g0ifjn4/14455469838.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/81969614130.pdfIn PDF document text
    • https://bloomeng.com/uploads/kovevaluxijiwemor.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d9d1c44d781---bowoxe.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/k0inefuj2ik56qgg6clbomhv76/77054793431.pdfIn PDF document text
    • https://trongtrucsolution.com/uploads/files/87919450680.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607682299d8a4---zonuji.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d1e3ead3d---35515284872.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/67715898942.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/keweridizuwuxapir.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bd66cc5c687---vetadifikekipinavogos.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/21012262001.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/ac9c95f31245450f2e91bccd27e5c183/radibagufav.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/48930cf4bd56dbb9bcbd65a647062841/29371258644.pdfIn PDF document text
    • http://domgr11.ru/uploads/files/47080609022.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/85100115511.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/58541052035.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddfaa5b061a---nisesof.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f67cb6d067---4741289909.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c12a3c8c52e---kivuzogizaba.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c926693ecb---46111111831.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/kubodozupedajakifuj.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF931 10688 bytes
SHA-256: 8a9b089236f13d5a498fab4778f6ef17566c6e3434b1be3849a7a5911519554f
font_01_sfnt_off000111c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C6 18136 bytes
SHA-256: 7d6f8cb2cdc0587fa8acd5c40c40b9ee4fa10405ca8195811258bea01652856a
font_02_sfnt_off00014046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14046 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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