Malicious PDF — malware analysis report

Static analysis result for SHA-256 0eed6534810aa204…

MALICIOUS

PDF

88.2 KB Created: 2021-08-02 23:50:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 2efdc03a3410bebb3cceadcbed6a7045 SHA-1: 0df7f325ee4f32be593585c05ea57fe0d9148735 SHA-256: 0eed6534810aa20497b02b887cd474f1df16a383036152ac80d29334876e00f0
164 Risk Score

Malware Insights

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

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 https://strechybenesov.cz/content/jafijebuperefakopew.pdf In PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/ruvafejeko.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/ijcc2jfnqm6t1k95ffi9vodpv0/3042897266.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/wawugewejukobifufegiwa.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/c44c7aff295c40b5c8f3f1ad6d4d5eba/96009627456.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce5abd270b---gozulis.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/74204592958.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/5ji3t9t6lskd1e53eps2vpthdc/pixowolavomisubileboz.pdfIn PDF document text
    • http://0851gay.org/userfiles/202107file/2021070612351970554.pdfIn PDF document text
    • http://old.smartplus.pl/ckfinder/userfiles/files/notizitexolubokawokilufi.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5192d8bab---wuxezewamitunodobumazeji.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/879feb2a624a86473b74bae3f21e82a2/50395089342.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c63071ab7e---38208944137.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/wikotuvi.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/53734511677.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/496654a770136957b9e71b7e7d321c63/52265331952.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/255510f1901d0c70b2d91a294459b162/metusizapeto.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1609fdf28d2314---84693047696.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/66871760069.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc8cbda046---mezij.pdfIn PDF document text
    • http://perksys.com/userfiles/file/jazubuxapexo.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/luwelug.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/40301686221.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/8409033577.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c340e3442a5---30502937071.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7dcdc6c1e---59744977676.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/pesumoza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=anime+super+battle+stars+xxv+v2+mugen+2019+download+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_off0000ee50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE50 11672 bytes
SHA-256: 527ef0282ae0898979b1fafe7cf577f5d9f8bb60f902a02a5f1c2f151b8cc05c
font_01_sfnt_off000109ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CE 18596 bytes
SHA-256: b3f475d2fb9941504fc2065dacd501e962586103373467209cf28d6cb902aa65
font_02_sfnt_off00013a37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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