Malicious PDF — malware analysis report

Static analysis result for SHA-256 17eda9117995ab13…

MALICIOUS

PDF

79.7 KB Created: 2021-07-04 08:08:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3847d9964e6e186baab0ae72d9d9c746 SHA-1: c0328e63a1a30c75913a21b1f8a99bf662e08f0b SHA-256: 17eda9117995ab13c8c2dc04c16f0166bd43dc8f5d28900bf5a0d1b248c6b0c4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to external resources, many of which are hosted on compromised CMS upload directories. The presence of a 'download button' heuristic further suggests a lure to trick users into clicking these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/7527bad4461fd27a4a2b8e3dde98faee/68683963198.pdf In PDF document text
    • http://angarakshaksecurity.com/userfiles/file/tusebuserelonalejemonad.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160b31f6512edb---11223618197.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160af8c363d77f---74563756613.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/vivej.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16070d4fa57a95---ninozuritaponibonap.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/monuxosawude.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202107010141247440.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a64a06cc1d---satoridofetawajanirisewa.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/82178397777.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d743f36a1---buzukivenev.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607401d080e5a---tepupukam.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/99396329296.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/6a22343ff7b124419ab58ac6a588baa9/72825717531.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/19def8972f88a06974fcbdd0937f29f2/koripisapofoxod.pdfIn PDF document text
    • http://wernitznigg.at/files/zewujumovolugimozubujod.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/7d869da3fef9354c170fbeefd05ffe78/nosuwakebofiroxaviwokur.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3ea83b451---zoverel.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/3d6beef9f92a68f944087833fca7ff32/19464072987.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7ba75106b---nanunofamodu.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607964504c26c---4199683850.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608aedcd15c6d---3306816992.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/kraoiv5mldj7pk6doi5sm87bvo/gizomatokux.pdfIn PDF document text
    • http://d-sign.co.in/wIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=thanks+for+watching+outroPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b9b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1CE 10676 bytes
SHA-256: 0cd4d580a24586c526485c5ff090a9dd99b683978acf3a364846110f09420452
font_02_sfnt_off0000ea57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA57 17112 bytes
SHA-256: 885b9024a80bd539ee88f4c17c1e1fa3cc6dab475ff5b740ebf17c73a317c9ed
font_03_sfnt_off00010339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10339 17008 bytes
SHA-256: f09e54d0c90c57d8f1f26465f1f1df1a7ac47b212a89c9d1b7b863193175c5ad