Malicious PDF — malware analysis report

Static analysis result for SHA-256 79d0bec798ac3a6a…

MALICIOUS

PDF

80.9 KB Created: 2021-07-19 03:03:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9a3a615296d1d355622f030c29e80c7d SHA-1: 1733f8de99e52fae293fc26767fef5e834de4793 SHA-256: 79d0bec798ac3a6a8d14bcb71bcf20eb3748c356ab929cf598b4b95cc5fcab0f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a PDF link farm. Multiple heuristics indicate the PDF contains numerous links pointing to potentially compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted from this sample, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/86d464dfa6b140413637e6fa3449f4db/73117528438.pdf In PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/90028642975.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff186a46f9---39139009487.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c940f120186---solubelalakuvomopovi.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be0a6370828---xulewujivokun.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/4gkv7gnq65bulk5n2am547pttg/nureso.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a87396aa556---luvatoredugexumunamikelun.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608fcc2ae46c4---66453945341.pdfIn PDF document text
    • http://takeacode.net/user/d41d8cd98f00b204e9800998ecf8427e/file/winopitozamodojukas.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609661ecdda89---tigefoduramejumiz.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608556ec24a5d---doderonag.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160820745e4491---xozokanarabe.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/megufip.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/oo322ul0d5dmq2m7ko6o9laa3e/pokigoto.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/wosapiwabujaxoxasofugeko.pdfIn PDF document text
    • http://royalgroup.at/tmp/zapibawuwebuzukereduzedor.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/gusoz.pdfIn PDF document text
    • http://terralindahigh1981.com/clients/866868/File/77948824242.pdfIn PDF document text
    • http://klinikoral.com/img/userfiles/files/medikev.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9cb0784cd---60819326014.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210620155907.pdfIn PDF document text
    • https://tavio.ru/files/file/1875227819.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0dac7d3172---lezatukuvitilomodobiliga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=words+that+start+with+q+and+end+in+gPDF 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_off0000d5d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D0 10708 bytes
SHA-256: f51d05b43fdcdbc5c4019935ddc8f91693a10b76b1cc5a1602f2def81ed98095
font_01_sfnt_off0000ede3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE3 18120 bytes
SHA-256: c7d4b4700686da7f0cc29f95b2ae6c4deb784fb0375c691318d331d6d60e09c4
font_02_sfnt_off00011c6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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