Malicious PDF — malware analysis report

Static analysis result for SHA-256 860e6bc59b8544f0…

MALICIOUS

PDF

80.3 KB Created: 2021-09-11 05:42:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0772b2f2b3ff45e4efcaa28c11cc084a SHA-1: 04f3daf5c7df8e97cc4d4d44bc0623882cfca11d SHA-256: 860e6bc59b8544f07e18a1b3b1145f5c82083a8c467d648581395b4d796abb66
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, but the structure itself is the attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9762

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pomodorolennep.de/gfx/userfiles/files/lozubibinelibanelogorov.pdf In PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/818825595.pdfIn PDF document text
    • https://12shio3.com/contents/files/lupibakamogiwitulisojase.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/molonixof.pdfIn PDF document text
    • http://ukrfirework.com/images/file/8384771527.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/14804258015.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/94678759436.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/51278511928.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613663eb21cd7---75366511758.pdfIn PDF document text
    • http://konyanincigkoftecisi.com/userfiles/file/zanefeponerotupamipotox.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/f2e3a678ecdcf65aa6f1bc0c2c1fecc7/saras.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161371c2cccf18---30397912527.pdfIn PDF document text
    • https://dsverano.com/UserFiles/File/xevinodegulip.pdfIn PDF document text
    • http://haki.vn/uploads/files/34122359881.pdfIn PDF document text
    • http://www.nbc.com.vn/ckfinder/userfiles/files/regoguvivu.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/digeto.pdfIn PDF document text
    • https://wildarium.com/ckfinder/userfiles/files/48636350034.pdfIn PDF document text
    • http://domario.ru/userfiles/file/91751004168.pdfIn PDF document text
    • http://knowleangling.co.uk/ckfinder/userfiles/files/60970378780.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/wozelexowamexebiboxiwevef.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/5434369555.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rawijevojaje.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210908_CA8BE47494C9DC2E.pdfIn PDF document text
    • http://karaokejdi.com/ckfinder/core/connector/php/upload/files/lupulexovus.pdfIn PDF document text
    • https://baptistfriends.org/media/mukuzof.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/f686ee035c4482578fa34622cf418661/86852680826.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/18191302270.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=free+fire+game+download+apk+for+pcPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCED 17756 bytes
SHA-256: 5b6c1e947ba1fa6fdba2edee1d4438dc30349450969ffc84e1533a96a7bdb002
font_01_sfnt_off0000d7e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E3 10852 bytes
SHA-256: 843b84fbc35fafaf82f475d813952fe32dc003b6da17c0d38642ded12eb1c31a
font_02_sfnt_off0000f0b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B4 16340 bytes
SHA-256: f2d46e702382a4691e9e1928379d8b3f29f483efe8ea39aee421af2783955a5a
font_03_sfnt_off00011a3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1