Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e6e18ee063453ec…

MALICIOUS

PDF

72.5 KB Created: 2021-09-04 03:27:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0b75c46fcfb1169a30412042c0cdf722 SHA-1: b62886b87ee1d149845590102e135d0a6341432c SHA-256: 8e6e18ee063453ec3c4458af1c4bcd06c47cbf90182dab1fc610584059ab66ef
156 Risk Score

Malware Insights

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

The PDF file contains a link farm, directing users to numerous external websites. Several heuristics indicate this is a malicious link farm, with some links pointing to compromised CMS uploads. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

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 https://infrive.ru/uplcv?utm_term=polymorphic+markers+pdf PDF link annotation
    • http://thaymanhinhlaptop.com/userfiles/file/bikixawum.pdfIn PDF document text
    • http://proximeo.com/ckfinder/userfiles/files/watazudobezenafasigajul.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/al6g618p2vrjhinvncqcpblsd2/rigukubig.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160f559dd874b8---tazukikopakogafik.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/jomirixarijepuser.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/85614969328.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xewujibozupedotosek.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba2135c957---89631715077.pdfIn PDF document text
    • https://quatcongnghieput.com/uploads/files/xulozolifekudiketevasa.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/rulugewefuvarumipikupij.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f223614b6---kitoropela.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/49153519970.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c84c7c60371---nagodovipojumuwigutexapis.pdfIn PDF document text
    • http://gewald.ru/content/Files/wakagejijuwe.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/keruxisemonuz.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/gopumaxokuwapofipi.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/zugekowutolezilas.pdfIn PDF document text
    • http://livingkaneohe.com/userimages/79767686317.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/16727273375.pdfIn PDF document text
    • https://unitytradecapital.com/ckfinder/userfiles/files/1001347886.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/oov78ueau5m5j3n7flnh37s153/93999197367.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ac8f8c8f6---galon.pdfIn PDF document text
    • http://brava-ekb.ru/userfiles/file/89061992577.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/ptkikeptj1tuos1q62ho341it1/jizor.pdfIn PDF document text
    • 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_off0000bb68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB68 10892 bytes
SHA-256: c8c28a7a61de1134be777a6502844078523f24c590ae34c34dcfe4e95871bac2
font_01_sfnt_off0000d49c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD49C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ecae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAE 15652 bytes
SHA-256: 429e3250c5489de4d59a21a48cf465d78213048588a5b5bd089ef59082d00e7f

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