Malicious PDF — malware analysis report

Static analysis result for SHA-256 58b31804a29751cc…

MALICIOUS

PDF

73.0 KB Created: 2021-09-14 10:43:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 19fc79e88ac9439295598c23e46622a1 SHA-1: 7d1417fe4912b823118a96e3f321a0683b4d42ca SHA-256: 58b31804a29751cccb2fd2f4d3df47e96f69858f50b3b7356746f75993637ac6
156 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 as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised CMS platforms. The presence of these links suggests an attempt to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://joy05.com/_UploadFile/Images/file/jisabavodakaxafozajalu.pdf In PDF document text
    • http://dtjxbpzx.com/filespath/files/20210907095613.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/nawavixoro.pdfIn PDF document text
    • http://monticellotownship.org/userfiles/file/660530944.pdfIn PDF document text
    • http://ngocphuocjsc.com/public/default/ckeditor/files/99884635703.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/23193846279.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161354aaa75350---91589847290.pdfIn PDF document text
    • https://galaxytraining.examinationonline.com/files/vamerikitoxajamaxedodes.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/mewagemugaginakima.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb5c2ce991---kasedakabijokulo.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/196d5e.pdfIn PDF document text
    • http://russia-ex.com/images/blog/file/60723264487.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/zazudugoz.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/wezupazotevawi.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612eec6316256---31458220471.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d05120326---1995468422.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/vawikirabufed.pdfIn PDF document text
    • http://xingzhongjing.com/userfiles/file/20210902180952_1842369365.pdfIn PDF document text
    • http://boki.hu/editor_up/23431215273.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/d2407d2bc7abd45de037ff5b4b4ed959/lukejivuxebovonatej.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/23260315391.pdfIn PDF document text
    • http://svb-volleyball.de/userfiles/file/nowanafaworuwugutemaj.pdfIn PDF document text
    • http://allasclub.com/campannas/file/57567730375.pdfIn PDF document text
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/66833422683.pdfIn PDF document text
    • http://wimborst-ceramics.nl/ckeditor/ckfinder/userfiles/files/38485122495.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=big+hero+6+online+movie+freePDF 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_off0000bc0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC0B 16492 bytes
SHA-256: 9830040d402501e4838ef6560495549b2310dfc3757feb31b781d4c8490e3e91
font_01_sfnt_off0000e63e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63E 10520 bytes
SHA-256: 2bdca3a952d5b516855a8d18f6b223a6280255bd55ab492cb5240b867c2c78b1
font_02_sfnt_off0000fe08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1