Malicious PDF — malware analysis report

Static analysis result for SHA-256 87859e6ded76fdcc…

MALICIOUS

PDF

80.5 KB Created: 2021-09-02 18:01:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3e726d193231bddb499d18ade599450b SHA-1: e924f0f61f9348517d767bb33f23670c0ea89fff SHA-256: 87859e6ded76fdcc1964a30cde8fe07d9a0ab4cc6b1872b566c6c997caef6ed7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing sites or download further malware. The presence of embedded JavaScript (T1059.007) and the nature of the links suggest a phishing or malware delivery attempt, fitting the Spearphishing Attachment (T1566.001) initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crewmak.ru/uplcv?utm_term=english+grammar+editing+worksheets PDF link annotation
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607271a9f18cb---xitodo.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/kuxikadumorireke.pdfIn PDF document text
    • https://nestsearch.in/admin/uploads/file/97248052018.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/56232420448.pdfIn PDF document text
    • http://xn--j1aii.su/userfiles/file/7615779878.pdfIn PDF document text
    • http://sro52.ru/uploads/files/tudisoxosalutukejigev.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/86637993053.pdfIn PDF document text
    • http://demirlermetal.com/resimler/files/xubibukiwuxawufi.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/35384165701.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d7b260140---66193868517.pdfIn PDF document text
    • http://thebestpearsonfamily.com/clients/e/e6/e6a49a9b6fa3fb0349b1957bd02e8b5b/File/60749810546.pdfIn PDF document text
    • https://rajatotogroup1.com/contents//files/72939910318.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/botud.pdfIn PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/33502464595.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/fupigafojusivugi.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/21277738804.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/tajidigavoviduzuja.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f996919a0---71333169515.pdfIn PDF document text
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/59032757246.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a40d53996f1---valewovafaranegibelukorak.pdfIn PDF document text
    • http://dgjst.com/upfile/file/38965346460.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/mogokejuworirasimim.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/5054e63140ce47f00c3947211a5c5bec/tobofobexefitenezutav.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_off0000d4d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D1 10856 bytes
SHA-256: fb5ef58e38e2703525aad24a149265fdb7964e07c18bc030196780e90c0a5a83
font_01_sfnt_off0000ed80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED80 17864 bytes
SHA-256: 3cd2b3928271c0d8d5873b3195af2da99a6a43061996d6fff1f1c8322b4b2d07
font_02_sfnt_off00011be7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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