Malicious PDF — malware analysis report

Static analysis result for SHA-256 8411681e8542a914…

MALICIOUS

PDF

97.4 KB Created: 2021-06-28 14:23:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9bddfe4440504eebfa4de9725f1796aa SHA-1: 5c3642e044a3c7d42313bb90c2fdad8749b9c42e SHA-256: 8411681e8542a914982dec5c78d7e8767e7fafc0fc773b8b4fa60f870bc2c6a8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs, many pointing to compromised WordPress sites. The ClamAV detection 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0' strongly suggests a phishing or trojan distribution intent. Although no scripts were explicitly extracted, the nature of the URLs and the ClamAV signature indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier clean score 0.1474

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://laborke.ru/uplcv?utm_term=how+to+have+sex+like+a+pro PDF link annotation
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f7f4ac74b---lujizujoropuxa.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/46013229951.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16072132b3e1fb---nixibinazitakigupadalip.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/946ed1765323546a6beca6bcb9fa43c0/wazodinofulelufo.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160879cec23b6b---55326698344.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/88689776744.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd550000f95---gemukatibofaxibudojelumar.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160814e1398de3---60639624320.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/vomowaxotidukilemugod.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/4eddai2khaqmjko8q8u430a698/76021636799.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1687e3665---mamewusuzagirexakesojixil.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/26492652166.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/be1f1c0102117a2e9105a85d011a6763/28763973347.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/h4smb26gq3kqp30uae1vgl7hu1/masigidelururitexi.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16077b6bb8f7e0---gidafusimopijakuzu.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16082653b9607c---disefejevededa.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608139c76b2a4---33266641722.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/8494073272.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/fgq8ipgp7gmk58k3kkkgahmoev/jubukutadade.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/5b755d3345594e0c8c38d75e67545afb/satuzubetizurexadega.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/ppepn0g1ontok1246q7dq2kk42/dejuvi.pdfIn PDF document text
    • https://brtim.com/uploads/wysiwyg/files/6944907322.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16081268b423e3---dafek.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/0u71dmbrn8sm095drrpbmhtk5i/basuwagixiwadugesevab.pdfIn 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_off0001234c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1234C 10580 bytes
SHA-256: cca9cae8b73c5b9920554ffcb824fd642728d3ebb359705558fd678c45245bcb
font_01_sfnt_off00013ba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000153b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153B4 17680 bytes
SHA-256: f85ade451108b5f6e2e6b3a21f73fc6580943f8b905ec5279285dbd64fd46501

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