Malicious PDF — malware analysis report

Static analysis result for SHA-256 865864fde45d3e4b…

MALICIOUS

PDF

76.9 KB Created: 2021-09-17 09:29:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 3c5b1bed9032cea543f75408b07a4c29 SHA-1: e93734993e76d4330bf1a02b89c4ca0baf7c0263 SHA-256: 865864fde45d3e4b375f12c79f15a4a6970222d8b9f6028b922028cf77ab1624
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several heuristics indicating it functions as a link farm. Notably, one heuristic identified links pointing to compromised WordPress upload storage, suggesting a potential for hosting malicious content or redirecting users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://giaydantuongphongngudep.com/images/news/file/rinolikugolofuginutuxuza.pdf In PDF document text
    • http://godsownproperties.com/userfiles/file/50874763562.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/92096570807.pdfIn PDF document text
    • https://tommytest.dish1314.com/data/html_editor/files/tolemaxef.pdfIn PDF document text
    • http://cocoal.com/uploads/file/99037860513.pdfIn PDF document text
    • http://unibeauty.com.br/ckfinder/userfiles/files/4593464133.pdfIn PDF document text
    • https://tp-pos.com/uploads/image/files/36006240706.pdfIn PDF document text
    • http://balcimimarlik.com/resimler/files/fuvilesodudulavade.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/64032942542.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/d223062d61af24474f24c02bbcb887f3/dusafiwenepo.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613547be5c745---95621303697.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/jupanazovuzexidu.pdfIn PDF document text
    • http://cjpharmtech.com/upload/files/vumopusawakofaxiwenupil.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613c814eb4d67---numolexom.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/kokojomanozidu.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16142939423c35---demegufiderefadud.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613bab16ec058---xemamoleloxibegile.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/30501628539.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/bijisovaso.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/xalutesuvipup.pdfIn PDF document text
    • http://mitroc.com/userfiles/file/29723009160.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/gusuvajatapu.pdfIn PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/24051400498.pdfIn PDF document text
    • https://journalofcritique.com/ckdosyalari/upload/files/ratiworowuxujo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=best+construction+game+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_off0000c97c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC97C 10820 bytes
SHA-256: 34b88a3a7a74057122e114518ea9645f2b5be446fb0213e2a794a6102af7a5d4
font_01_sfnt_off0000e243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE243 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA55 17224 bytes
SHA-256: 4ed5c72b6a136895f0fea28d69611f566387b8a586f2af0c2518607b25c2a8e1