Malicious PDF — malware analysis report

Static analysis result for SHA-256 19eea512fe47bb11…

MALICIOUS

PDF

74.4 KB Created: 2021-09-14 06:08:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c87e2f8e25a58b471f82a2ac52acc950 SHA-1: 96e3d92fe9299f6c51a638d37bf3fc4e88f5ea25 SHA-256: 19eea512fe47bb118da3b984c6884f1a5a4d466a7dbb3df0a868093f865ed07d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic point towards an attempt to obfuscate malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://silverk.ru/img/lib/file/geduwep.pdf In PDF document text
    • http://gachmenminhchien.com/media/ftp/file/ditamozaguvesi.pdfIn PDF document text
    • http://jcnjl.com/userfiles/files/finupasuxezebepelutas.pdfIn PDF document text
    • http://vibrator4you.cz/UserFiles/File/93329780738.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/tuzuvisosap.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/25572233413.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6f4c9cd77---xulegepowekevijusijapi.pdfIn PDF document text
    • http://www.huescalamagiaenfotos.com/userfiles/files/ravetowebiruluvu.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/6585376411.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/nuzumenilunov.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/81734008838.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/gugigejebanogiw.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210908_111937.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f582926848---66368643180.pdfIn PDF document text
    • http://delve-cr.com/uploads/diriwiwokelitifawuw.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613c598a40a3b---kemuneme.pdfIn PDF document text
    • http://tubelessons.net/cms_images/file/36038607726.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/ratizawejixugiwumeziwav.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/85f29bb010b6d38875fd08cf41461c99/vovofepiloseguzemuleb.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16139968c68e70---zefavagusitojulo.pdfIn PDF document text
    • https://diphong.com/uploads/85218725688.pdfIn PDF document text
    • http://24x7taazasamachar.com/assets/ckfinder/core/connector/php/uploads/files/59221586402.pdfIn PDF document text
    • https://smshealthcareservices.com/ckfinder/userfiles/files/kenovebixizetusavamawibaj.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/matuforujopibawafexane.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+to+get+money+with+kiddionsPDF 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_off0000bd69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD580 10672 bytes
SHA-256: 356be396317f707947da4bb434a27245fee09480c0f86dceac92cfc47dd18ac7
font_02_sfnt_off0000ed8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8F 18136 bytes
SHA-256: efa32328ff760f924afbdc86694cbed8798a5ce0427cda3391624db67a6cf8d8