Malicious PDF — malware analysis report

Static analysis result for SHA-256 83ba217e63dbccf0…

MALICIOUS

PDF

81.5 KB Created: 2021-09-05 14:13:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bbf18587ba3d57a20a513dba65d41db4 SHA-1: 6840cfeeb6a38d331dbd4751d9f710cff2b159d6 SHA-256: 83ba217e63dbccf07744f762ab551b189050f42f705751041d979a4c61ed0313
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised CMS uploads and disposable domains, indicating a link farm designed to lure users to malicious sites. ClamAV and ML classifiers strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://adaviestransportltd.com/userfiles/file/jixudibakefowomezabos.pdf In PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c114e0d8435---pigamopu.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/pewabuxidudami.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/fff638e1c8ae1dede38dc6f7dad8b527/19414745303.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1621447705.pdfIn PDF document text
    • http://ligneus.hu/upload/file/powikine.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/fegavapikofamevol.pdfIn PDF document text
    • https://vientangluc.com/upload/files/12878056310.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0cffb1258---11700587614.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/bidulekul.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/7b4db8588d7b4a82df3ab6f414a8044a/wileriworati.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/dobegabegudutazubimulibij.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/29828774105.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608b716521f44---fakadatasezepebatalalub.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/6558606eb52f3db152cdb97a83d2bb0a/35060197998.pdfIn PDF document text
    • http://rsst77.ru/upload/files/xiwososaxifedesexine.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/sggoe7s9kj86642si4b2imqrd3/9613087065.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/vigibudu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5f00027ed---lurorowugexurud.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/1ei19r0v5bui1dpe8nltf55j7g/40845509224.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/7590b85d390f5ad7e07a42c03de66d8e/lewajubobujusorox.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/99306868737.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210701214340.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/eq7fpjah8c20fqpsajl031b0hm/78108849653.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=pid+controller+application+in+industry+pdfPDF 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_off0000d968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD968 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f17a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17A 17568 bytes
SHA-256: 2537c4bc8c5dad481d2c9ee23b59dd43217e2ea328ef8c7c30363900f89c9b70
font_02_sfnt_off00011f31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F31 10828 bytes
SHA-256: d5474dee73f0d8ae4f9e112c35f71c2921a74f7052894c69cd30d7f4726eb968