Malicious PDF — malware analysis report

Static analysis result for SHA-256 d16b7da7f2a8c4d9…

MALICIOUS

PDF

87.0 KB Created: 2021-09-13 13:27:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 776580e653417ba9f19548d4b1c1ca95 SHA-1: de72be74ee0e67f41fff6447d37eeb2c52ab77c7 SHA-256: d16b7da7f2a8c4d9c27bcccdcbcd2aa262d9419a68f4b8c52043bf353da147d0
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using these links for SEO poisoning or to host further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=gay+tony+cheat+codes+xbox+360 PDF link annotation
    • http://studiotecnicofrisoli.com/userfiles/files/63088888059.pdfIn PDF document text
    • http://sakem.org/userfiles/files/67177570216.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/a2b31a4c1b54dc692e04a2a2d7847a0d/xonesibuge.pdfIn PDF document text
    • http://satunatc.ac.th/ckfinder/userfiles/files/bagowuxina.pdfIn PDF document text
    • https://gogreenonline.net/userfiles/image/fckeditor/file/jawinikoruxirinowaripilu.pdfIn PDF document text
    • https://dm288.rs/slicice/file/82477221014.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/53036786654.pdfIn PDF document text
    • http://golfvillageonline.com/userfiles/file/botisunofukenijate.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/wipofidetiwojex.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613be0a02beaa---kesudatasadunotezatilin.pdfIn PDF document text
    • http://jar-ted.pl/file/dufiwetafebimowewek.pdfIn PDF document text
    • https://ksboutlet.com/file/files/burikefinepari.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/161324c987cb40---lisisusowewemiwixoj.pdfIn PDF document text
    • https://zmiz.hr/userfiles/file/xexubulobubojeka.pdfIn PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/xitixelugisadewus.pdfIn PDF document text
    • https://coffotea.com/uploads/files/202109061045198485.pdfIn PDF document text
    • https://ubitanduk.com/contents/files/fosujowokapotodopowexuwa.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/46027735834.pdfIn PDF document text
    • https://lajovisena.com/gallery/file/72378829005.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/161330442a0fd4---zibudejulamaz.pdfIn PDF document text
    • https://thehouseproduction.net/file/11066685304.pdfIn PDF document text
    • http://eko-baby.ru/userfiles/file/36659484737.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_off0000e9a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A4 19252 bytes
SHA-256: 7d3be4aec7acb2b6d8e883439ab5db2547097787f5e7a79c5dd5769bd06d81ba
font_01_sfnt_off00011c24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C24 11088 bytes
SHA-256: 062dd30b8dad47d0b3f5e8af4a6d10f837fa3fd06c0ebec4f0d6c09d1d1f7e3d
font_02_sfnt_off0001360b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1360B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1