Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f1e4e4e6395d839…

MALICIOUS

PDF

100.7 KB Created: 2021-07-20 20:38:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6f51325631599453c524b8acad7e9a9a SHA-1: e4fdd0be97a78d9dfbdd37796a7e4cc7c2de504c SHA-256: 2f1e4e4e6395d839b124e7ad87b7ef7a4cb91cb8c161c0ca2f4339a6a587b32a
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many of which point to compromised WordPress sites hosting other PDFs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings clearly identify its function as a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9803

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://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/td06ofiq00u1df41etgq2a8gfi/totebori.pdf In PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b009856e06---tijodutiw.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7d951eaff---70595397653.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/77nl7ogelk4ec58kktoar0m179/xelujojo.pdfIn PDF document text
    • https://aashianarealty.com/file/77480707301.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1e79dfafc---lavene.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/kugemaxatetuwiz.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/caa0a0535b185afd29b9194d2eb67104/78147275320.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/zabofawixinakavataku.pdfIn PDF document text
    • http://msinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/4467800641.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607df1c799c7f---latiwegomabukareka.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/f9486d4f41f433f24ae19f348b685653/95467856756.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0eb56a124---61698135210.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/606ad47de158ec5136619def3ec05f7c/kavifaxoludod.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210522031049853977919.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b172017d779---60961181499.pdfIn PDF document text
    • http://asustainable.com/global/file/86994612129.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/59e7cd2dfc9f50cc4808a49b7588b218/61398437277.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/83643796900.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160901fcaca713---rorikop.pdfIn PDF document text
    • http://guitarenko.fr/img/files/kajaruxibidafivazuvedudi.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/71bc64c9a9562ddb6492c932abc18e5c/71415279454.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/2e3e09f3b00dd4f1b21e5517afcdc1c3/kivon.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e591b29017e---52707732249.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2569c2d11---fobiwetowopod.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/1ai3gl6kj7itlcv9epqfr2htj2/lupugavagobukotifasupu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=t+hypothesis+test+calculatorPDF 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_off00011c89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000134a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134A0 10544 bytes
SHA-256: 573a277317abed63130afa05c87791dfbcebde6204af150d0660337fedc833fe
font_02_sfnt_off00014cde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CDE 20668 bytes
SHA-256: 151c237ce17ea5fee48c9b8ad59c03d3bcc8f2bf7ac9168ea2438c58d49d5456

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