Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8e62e7ac504aa43…

MALICIOUS

PDF

87.2 KB Created: 2021-09-06 00:48:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 60a257974e4e6d27281ad1cbf9cb576d SHA-1: bb38f235d2b524d0dca21f708cafc01dd1daf872 SHA-256: c8e62e7ac504aa43ac63df2edbaf97009f7e8dfded25a2ce019cf4f31b932384
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://huntic.ru/uplcv?utm_term=chicco+nextfit+zip+user+manual PDF link annotation
    • https://otartufo.com/ckfinder/tartufofiles/files/60873211806.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/file/wepepidebepasagarezarasez.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/rodewakuzeke.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160925a51689be---saparatofuwizaketererog.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/13678926803.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/79896228030.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/20765060527.pdfIn PDF document text
    • https://faprosid.com/file/logapidixirevijamejuji.pdfIn PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/lirulalejapagozif.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/zebog.pdfIn PDF document text
    • http://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/47226493143.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/8f187e83e83e052495003337b4656755/1877935212.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/116b52f16f4e86ed25a819031402c2a5/lexipazerabozixinajovipom.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/eii107bln7fi0ocd185rdr2v6e/12168421230.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f30bbf1c4---watepetegotexitusu.pdfIn PDF document text
    • http://lyshiying.com/d/files/62418889983.pdfIn PDF document text
    • http://canoto.us/Images_upload/files/gomodi.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/dutizigi.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f16b2b8b61---80068340354.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/25484996279.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/4ec451f2387e896974177b0c5ce1eb0d/96370399687.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607c348e1ca66---zukofetewajefuti.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160856b0099c22---natuxunaliwufilupe.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/67974012726.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1898024f9---dusofulorowajarerotarinut.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC681 16224 bytes
SHA-256: 64f0b6da39172dd4ee9c660e9e76f1d0ebbe60724ed3c05c35423f428b189fc8
font_01_sfnt_off0000dc71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF483 21932 bytes
SHA-256: 6b189828e49559a30ddaec17d6097eb70d8553391c192fa891a3cc6798071100
font_03_sfnt_off00012c77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C77 11040 bytes
SHA-256: f1da9ad1ba905776db4b5d3152f341dc0ffd6ea018d899d44d574c103ce724c3
font_04_sfnt_off000145fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145FE 1804 bytes
SHA-256: 689253499be5b3f2b6aa24221262c433e64ffb7dad8c6ae682de4ce36f22cd3c

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