Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b3502103b471f4c…

MALICIOUS

PDF

89.3 KB Created: 2021-08-08 06:02:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3e60209083a7c7f7ee9b70afae256e9a SHA-1: 334adb6ef36722a0d5f4263f95f3f86fcc247830 SHA-256: 5b3502103b471f4c6ee391c72be8c405b45a374f2d8c0b09ce6c51d484e6556b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://jinwoosmc.com/userfiles/file/zumifasorenixekivudube.pdf In PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/jsuvgk8qlq1leks5qu0crqspd6/17194182149.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a784392715e---19436222514.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be53c0c7d79---gefuke.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/1883998363.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/48367245557.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/60df42d4948829bba866939748cac27b/27428404027.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/26749437440.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///javotobe.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/85540929534.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/58199821088.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/0a3fc39057d7ecc9754e2184bda56948/21660394078.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/612mrsvv1mvcsktg27cd732gc7/gagovasesejukebide.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210514194958155.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/ccb7e0c63f921196019b2aee503de9a0/neguloxajiwiku.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/35659025978.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/4d82da314184819d673deaac1712762b/gilivemaxuvoboziz.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/jvlbaam82fvohav88f23anltu6/83298673424.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/3b50f1a83f35ccbaf9e3476a0ef7798e/78588248635.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/e342b901a03f03f3273e62ddf552fca8/mejot.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/216594c210d54952b26a1c012dcd3ea2/nalifewiwejowisavuma.pdfIn PDF document text
    • http://1975geegees.com/clients/78603/File/96364804148.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825ba15b8b6---10897822694.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/mnh7nkejn7m2567lr67ev1tfuh/lebekidoxomaxutosoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=is+there+a+switch+emulatorPDF 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_off0000f969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF969 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11180 10528 bytes
SHA-256: bce4aeb2525050e7895ff3fbcd3bdcffae83771083be043e1e04ffa4d7942536
font_02_sfnt_off00012994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12994 17732 bytes
SHA-256: 9221fae373e41d50ee2252a8cc87a309c5ac35cd96667f91fb4e22be82529f78

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