Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf1fa49f3d790125…

MALICIOUS

PDF

81.6 KB Created: 2021-09-15 22:12:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 041f3a3c32180ba9a4dc55599492f193 SHA-1: 4ad418f094c0d1d2bf88e2cb87d3bd5b8a853311 SHA-256: cf1fa49f3d7901252a58590aa11cf5a24a38f99b1e93579742d17b6872cb7cf0
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to distribute malicious content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document may also instruct users to open password-protected archives, a common tactic to bypass security scans.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://coretry.ru/uplcv?utm_term=play+ps2+emulator+android+best+settings PDF link annotation
    • http://fortwashington.abwingsmd.com/uploads/files/91057714140.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/df0a37c0277c21ee870cd79823abb17d/mobavapimusomibi.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/zawezolukenegifuxoratakug.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/talezox.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/21692735564.pdfIn PDF document text
    • http://tianfonmm.com/d/files/56006776834.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/44176359742.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/161344d547d6e3---witemusate.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/ruremifipekov.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/72152905148.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/14775525230.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4e4eb317d---juvufusetezebekibazek.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/7345391175.pdfIn PDF document text
    • https://iword.de/userfiles/file/827621153.pdfIn PDF document text
    • http://canadapremiumlubes.com/survey/userfiles/files/zegalisuwuduzusorowojija.pdfIn PDF document text
    • https://www.wappa.com.au/siteadmin/ckfinder/userfiles/files/27943379108.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/30365405786.pdfIn PDF document text
    • https://flomogroup.com/upload/files/kabupijomoguxuzawifem.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ebc07cd31---55937348179.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/95319333444.pdfIn PDF document text
    • http://grandviewcommunity.com/userimages/60916131725.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_off0000d95e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF175 11212 bytes
SHA-256: e00a3cb286279cc3037bbcf096b86a5eb27f47047c1ebdef60dd5db0f83cff6e
font_02_sfnt_off00010b56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B56 17616 bytes
SHA-256: 14de4b59769d6e65e59badcc0136b731f70faa513a712f907b6bc3e058ec5cb4

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