Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f8a9f1123e0ef3f…

MALICIOUS

PDF

90.6 KB Created: 2021-09-02 00:43:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3b3f3740cbb64d981a9320ce3150cfe4 SHA-1: 92927a70e01b50b58e8c40f32461a80280112eb1 SHA-256: 6f8a9f1123e0ef3f679c295ff85f244bc39951d1efca9065716a674825330f1c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, with several URLs pointing to compromised CMS upload directories, suggesting a distribution mechanism for further payloads. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic strongly suggests the document's purpose is to instruct the user to open a password-protected archive, a common tactic to bypass gateway security.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://deccanquest.com/konadnew/userfiles/file/27549631656.pdf In PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1611807cb3ee3c---80236390621.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/1af64bb477fdc706e646d56c3c03ecc7/jelowifuk.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/20215211626105584.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/ponorukaduf.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/v4u164p2bholiqa9m3r14dfn9v/10129974487.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/fa7a3d7fe088dd39a399de0dd306c05e/gugorixebam.pdfIn PDF document text
    • http://poiskvod.ru/images/file/zetil.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/fd12f8c050e51ad4c5202347f55e1971/muwapugituk.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608186ca55b95---53898363207.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/jetavabikonibojagu.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/97408229611.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d82fbd324b---witegopigoputosexe.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8fae958922---vatovesaliv.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608551c46bbde---79553564469.pdfIn PDF document text
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e3c092700---70690366190.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a059559522f---40864829618.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/jowazikesagivesutar.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/b1t1b06utjkqiovk21dh2fvf97/tavaz.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c71f9d3b1ab---21000563689.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a564a3d96cc---46976302266.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9614c5c1c6---guzedawo.pdfIn PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/nadanidu.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/36578631454.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=what+is+a+load+in+moving+and+handlingPDF 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_off0000fc00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11412 18668 bytes
SHA-256: 74638cf00e3ff74b94d5ce1ed6a13e403af5233fe645d4c13ad4ea8a3302c986
font_02_sfnt_off000144fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144FE 10520 bytes
SHA-256: 8da61e7fb26d8c6fc7d09e38e9fda784d8fac80d9710d7ec04c9ba4d26d8a14f

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