Malicious PDF — malware analysis report

Static analysis result for SHA-256 16dceb935e824bde…

MALICIOUS

PDF

106.7 KB Created: 2021-06-25 15:16:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 9ad521087d399877dd18a9e4a740b5b6 SHA-1: 5dda25a51e431783fc72f0a014bd20d82e5039a6 SHA-256: 16dceb935e824bde6ce8c54556cd6869427674900d181599391b1fcc28c21e6d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, likely intended to redirect users to phishing sites or download further malware. The presence of 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicates a deliberate attempt to obscure the final destination and leverage compromised infrastructure. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9900

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://ketchas.ru/uplcv?utm_term=spur+meaning+in+telugu PDF link annotation
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/7a9b291805b4873e72a118e84449ee7a/makawoterufe.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609aab8bd7e8e---kalivirixoginu.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9ceb4e044---xujin.pdfIn PDF document text
    • http://bjsprt.com/uploadfile/file///2021051216241133.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/tatiluwubikerujuliz.pdfIn PDF document text
    • http://seashoresilverlabradors.com/clients/4/48/482fd9669fb3260065120a60ccac5e48/File/lepun.pdfIn PDF document text
    • https://maintogelonline.info/contents//files/43498855239.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/30a7393f6a9bf387cfc2f3dc640e6c3e/bagovapuletaramelerenigo.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/38051240048.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/lasem.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/gidosironudunonugevel.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/7evgumdala8vgeu1tdtl9tddk5/79717779424.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/atr41k2dhugl64ivvtfgmebad1/fipodutofarid.pdfIn PDF document text
    • https://tahubunting1.com/contents//files/3488551636.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855182e17b1---laputakabijiko.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/d08b2f550ef32f7a56a6837717970da8/navetepatisen.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000109c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C2 5368 bytes
SHA-256: 624c6860dec60a325bbd5ccfc9d9b0739177db33f92e3c673b8a61a53884b94e
font_01_sfnt_off00011ca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA5 21300 bytes
SHA-256: 7b3a80682e4e03299dd8777132cc2881c3059ce22c4cf26254de16333de47e3a
font_02_sfnt_off00015296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15296 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00016aa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AA7 17100 bytes
SHA-256: af6352c6d9b0e605407c38fa74e817a8d81e4c92f12c4f8e92d0996264b0d156
font_04_sfnt_off000183e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x183E7 10484 bytes
SHA-256: 741a34d9a11ebb8cf1319823dc028c8c69d237eafde56fb655d81203f9d1c95f

Open this report in the interactive analyzer, or submit your own file for analysis.