Malicious PDF — malware analysis report

Static analysis result for SHA-256 f383760fcccee766…

MALICIOUS

PDF

85.5 KB Created: 2021-07-26 07:18:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: cbb93048b64e0c502c8036ef6f831e96 SHA-1: 0732a354d8d5696dc255b4cf40b7ce83a6c46da4 SHA-256: f383760fcccee76617c2cb4e408fdd60dcb51dee6d7184b75ce4e0aa0a48b562
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many pointing to websites hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://proxkimya.com/resimler/files/57853556587.pdf In PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/7c611c9a1f073cdc0f7738e0cf412fa5/9051486692.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ccfc128f94---lariwufi.pdfIn PDF document text
    • https://tonitomov.com/picture/file/2004660930.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/papudugepamexuxel.pdfIn PDF document text
    • https://12shio2.com/contents//files/33136307148.pdfIn PDF document text
    • http://abc-tel.ru/data/File/69024041970.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/38425685441.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/58395344388.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fda4fd6fd1---17039423638.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b122f1d8097---nokajabokulafuf.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/64901098758.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/db26945d6edd313432a589a1e5a8684f/zegokoki.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/84a7ae2d7e7841d8a3101244f439e8a3/wunebamizuliverewakeridub.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021052915223073499.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/25df1d2e6e2dd8e0e39714a747f7f4ff/ropazipuxovelur.pdfIn PDF document text
    • https://kawanmto.net/contents//files/11524348204.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f32774b28c0---miweturezus.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/51709249134.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/pidotomanivoz.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/236e3dcd88de546b1f6a82c81e4f849b/22059389413.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/d6879efe7f793dd5388dafba96146f9e/96947406208.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16073640111534---mekitebipanubujofanepe.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/delimuwa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=why+is+my+black+ink+not+workingPDF 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_off0000ea62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10279 10968 bytes
SHA-256: 00386ae07e19165dca07cdf85b4e5ce0e48ebcdea4885e654de9a1dd240cc3e8
font_02_sfnt_off00011bd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD0 16636 bytes
SHA-256: 4696878201b33344ca2d84d4e350ccb6b39d4cfeb212bd24b065482199a75749

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