Malicious PDF — malware analysis report

Static analysis result for SHA-256 08de2d6e2b4fe579…

MALICIOUS

PDF

104.5 KB Created: 2021-07-24 18:09:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 5c984acda9e14b37808f09f727a00799 SHA-1: 0c54d22a737dd0f7dfaccab0c19a4ff8d8520900 SHA-256: 08de2d6e2b4fe579ce6a547372fbb20db00351eadf924f532795ecdafbd74871
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160afc89c20db8---39807178261.pdf In PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608967a3d4e03---74143839410.pdfIn PDF document text
    • http://119pump.net/d/files/97823077464.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/dvl2t3f0vvg0jsja27pk2h6a0c/gufakolefalodasixomeserij.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/jekuwukikobijubakirugufag.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b1434fac134---18604252668.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/65b547761bd006e510f877212afe8617/91240706007.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b730b8ff1c---22941375472.pdfIn PDF document text
    • http://cassotech.nl/site/data/ws/files/42461241481.pdfIn PDF document text
    • http://grandchainfamilyfoundation.org/clients/85333/File/12547187902.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5b368cbe9---xotufuvujevas.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/zepulalorudi.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/poxipiridopoxunof.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/zexaritojoxoki.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/652a1ec8876f20e5600814c64f00a048/kabusejotuxurexe.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/gvenlbarf6afnfvfc91ekq9023/45423313219.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b77555ab59c---fotifubewutuferelag.pdfIn PDF document text
    • http://bi-acaovo.com/upload/files/goxuxokirivobojawuzit.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/95a574ff6508f886e58985ad2cd497a6/kekofu.pdfIn PDF document text
    • http://www.ortodonciaelisafarache.com/ckfinder/userfiles/files/dixexoxin.pdfIn PDF document text
    • http://jenan.com/ckfinder/userfiles/files/87942496754.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=frigidaire+front+load+washer+repair+manualPDF 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_off00013597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13597 17336 bytes
SHA-256: bb3080ef57a7926b3471179bb04edff4e0b97666a4cd016f8845c30e6f631c75
font_01_sfnt_off00016305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16305 11108 bytes
SHA-256: 32abe0c3f3e71fc00eeea001461273e32ce767f21d405dca68d7a4ff43cdc4e8
font_02_sfnt_off00017c8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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