Malicious PDF — malware analysis report

Static analysis result for SHA-256 151c49411ddfc943…

MALICIOUS

PDF

83.3 KB Created: 2021-09-12 11:16:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 37bb7a8eca2d79d2b18241acb00cf8a2 SHA-1: af2647ff6c26ee00c08b55ae6e8f6443f49bacaf SHA-256: 151c49411ddfc9433013edd0eed3117b179ffe5c3094cbd5c8dff6e205e3da7b
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to various domains, many of which are hosted on disposable or compromised infrastructure. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports its role in distributing malicious content or leading users to phishing sites.

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://cabanagarden.hu/editor_up/21508344797.pdf In PDF document text
    • https://xn--49st2et51duvk.com/upload/files/mexajaxazuveruxowizodilu.pdfIn PDF document text
    • http://walosports.cl/userfiles/file/dinutojamelorusi.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/kadomapigezotewal.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161362f1623e13---78585694127.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613508d491a31---54359154174.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/1472075623.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/gifagadejijovarefulibez.pdfIn PDF document text
    • https://h1t-urlaurora1-turbo.com/contents/files/dedupevazesibufor.pdfIn PDF document text
    • http://blueyee.com/upload/file/100600081263.pdfIn PDF document text
    • https://astoraccessories.com/uploads/ckfinder/files/57121837740.pdfIn PDF document text
    • https://terracell.info/images/file/54845029789.pdfIn PDF document text
    • http://nokianhakkablue.ru/ckfinder/userfiles/files/kutidelolutuvorolabik.pdfIn PDF document text
    • http://buyo-g.net/userfiles/file/39730969285.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/99183710840.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/86393718895.pdfIn PDF document text
    • http://roosprommenschenckelfoundation.nl/userfiles/file/davapozamod.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/33471351268.pdfIn PDF document text
    • http://prasongp.com/file_media/file_image/file/43042964060.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/watemulak.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/t9ses0d6srniou0ct07kkjqmog/tomuxuzobu.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/46821873576.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/mibisuxemavamexuv.pdfIn PDF document text
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/tezapetetawog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+send+a+group+text+individually+androidPDF 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_off0000e0f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f90e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90E 11028 bytes
SHA-256: 13d10b7caeaa25a81e268979146006fbc78acd6fa237335bb3ba12af00cd69e2
font_02_sfnt_off000112a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A9 17228 bytes
SHA-256: 1ac373e4de24618f31f7b8bb3c3a12e5b4c88b9d326655b05721f3e3d4a524b2

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