Malicious PDF — malware analysis report

Static analysis result for SHA-256 15512b48ebbefeb9…

MALICIOUS

PDF

85.6 KB Created: 2021-09-07 09:17:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3bc96fb2d82d02829f6c744924c09744 SHA-1: 45e088d17d93cc13e18b882434b50832077e4b9c SHA-256: 15512b48ebbefeb9c3cbc652f35428ed9ed72456ea019fd53417d693ed8dbb61
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised web hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting an attempt to obscure the true destination or evade detection. The presence of multiple PDF files hosted on various domains, including compromised CMS uploads, reinforces the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2548

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://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