Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e3c03391fedc0b8…

MALICIOUS

PDF

88.2 KB Created: 2021-09-07 09:17:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 590b436bc6ae0438fe4b5cfd4a4f5ef2 SHA-1: 16bf8466a29b3408323bbb22e45b2f43aa920d88 SHA-256: 1e3c03391fedc0b84eece8e9d653af99da195fe9ba942753efe6525bb11120f7
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting. The primary purpose appears to be directing users to external, potentially malicious content through a deceptive link structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://nstyapi.com/resimler/files/bovatifuzitisaxoruzexila.pdf In PDF document text
    • http://rund.cz/UserFiles/File/lasajizipumeriwowasozonaj.pdfIn PDF document text
    • http://life-worldwide.org/assets/uploads/files/tebafajipigadididubi.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/32907235043.pdfIn PDF document text
    • http://tivati.com/uploads/userfiles/file/46583030971.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16091f6d8164e7---86716522639.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/cjrf5n7e2au5ke4coabl601ngn/55530612873.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/99006048230.pdfIn PDF document text
    • http://yjccnc.com/upload/files/xazenugaginij.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/70c3e51bf72a519e90fadf85f96e6e02/85862280647.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/vmshba89rmkh074iafkrrv5icm/lugixolinane.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/a9102fe46a9a9d8eeb36b47ddf29c7fa/memasutuje.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160be0217345e4---31004361593.pdfIn PDF document text
    • http://www.520amis.com/upload/files/60326015736.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/7891590806.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/wikotijegurifuzowapo.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/jubenabuzepadefagoji.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/7gkme05ufpgq3e2mr82e6g99e3/dofosoxuregivitafonuwajok.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/paluvaxigufasanegidajefop.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/kobofesoliwapibemif.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b15f12742---27249531307.pdfIn PDF document text
    • https://tepihtrava.rs//files/15769008045.pdfIn PDF document text
    • http://cachnhietwin.com/luutru/files/94691294093.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=manual+driving+games+for+androidPDF 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_off0000f523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF523 17492 bytes
SHA-256: 57884d1d334ae4698614694f797aea234d61c332d40304539d0305adbabb4edd
font_01_sfnt_off000122d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013aea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AEA 10756 bytes
SHA-256: a6fc7cc27c41bb12f888d5ae9d84dcbb551a008101eeb5689304622422263e0f

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