Malicious PDF — malware analysis report

Static analysis result for SHA-256 500ea4fc74752e87…

MALICIOUS

PDF

101.3 KB Created: 2021-09-05 02:15:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 620baeac05aa307dd2c518a3d6331dd4 SHA-1: 9fdb67609539d41c32ae3a4e4e8ccda982f3f195 SHA-256: 500ea4fc74752e877106b7e34a72c6f3aad124d948383b5438ac3e8c30dd1acf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to a link farm strategy, likely intended to redirect users to phishing sites or download further malicious content. The presence of 'utm_term' parameters in some URLs suggests an attempt to track user engagement with the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://laborke.ru/uplcv?utm_term=multidimensional+array+in+javascript+pdf PDF link annotation
    • http://novosib-sport.ru/ckfinder/userfiles/files/momuson.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/ds25ag6361tjponve5l35c4703/81182671014.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ded280f43---44721251329.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/temakataruwibolanibidexaj.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/futudawakoriw.pdfIn PDF document text
    • http://graphicyazd.com/ckfinder/userfiles/files/vetifegilisoli.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/tesudaxusunarelafatak.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/1d9be1dc40843cc7b10ec430b929a3f9/81802237007.pdfIn PDF document text
    • http://chemtron-vostok.ru/media/file/mowelavaf.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f1245baf4---25486993231.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/79451968229.pdfIn PDF document text
    • https://havilahbuilders.com/userfiles/file/79736687328.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/parotetagebefoj.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16093ba31bfe19---simeroxofu.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160f130443b2a9---11658833895.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7b1b35e36---nenevofoxozorozanenetu.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/mofot.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/wovitemefuvuvunexagote.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021063012442665.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbaceb40f1f---78896003481.pdfIn PDF document text
    • https://thaibamboorestaurant.ca/phpsites/bard_ford/uploads/file/46060894603.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/855b7637dbcdebd0392da64fb714ea71/34525149674.pdfIn PDF document text
    • http://bjjiffy.com/upload/bapojuluwebuxivomofitem.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_off000121bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000139d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139D1 19404 bytes
SHA-256: 567e88503b2d95a93c8bd60145fa264eaf94f0ee250e255a22a6d6ac3856ea9a
font_02_sfnt_off00016d1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D1A 11184 bytes
SHA-256: 71effd22aeaa6899e2cb430f07f5311619307779b84b16ceacd62aa77bf60de0

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