Malicious PDF — malware analysis report

Static analysis result for SHA-256 54f1b713182af3da…

MALICIOUS

PDF

84.5 KB Created: 2021-10-07 02:03:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2b5e0b55aa2a82aa904a9bd9a9b6fd14 SHA-1: 39dcbe493ce754b6284dcec11ce3928f29ae4cc0 SHA-256: 54f1b713182af3da765b028b4318ec329d6a90f0245053f75a53a3e0928bdadb
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to domains associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content. ClamAV detection and ML classification strongly suggest malicious intent, likely for phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/29eg9ou3vi2oga0foekp8p37t7/jasovuvobuzapinoralox.pdf In PDF document text
    • http://xedaphcm.com/luutru/files/buvurokibapal.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/mubuwoga.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/f733b5f3c8a82b401fe1e7f0be5950e3/tometanifaviwa.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/zitegemanesuveniman.pdfIn PDF document text
    • https://ef.msfoody.com/upload/files/patepenataxawerulu.pdfIn PDF document text
    • https://paulogomeslda.com/userfiles/file/29245604163.pdfIn PDF document text
    • https://minhvuongthuphap.com/upload/ck/files/vixafisovafeb.pdfIn PDF document text
    • http://danbikoreansj.com/uploads/files/petazasib.pdfIn PDF document text
    • http://architettorobertafasola.eu/userfiles/files/63829921959.pdfIn PDF document text
    • https://webkapper.nl/ckfinder/userfiles/files/taxeganipizotiso.pdfIn PDF document text
    • http://modelseafarm.com/kweb/ckfinder/userfiles/files/87496877611.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/36361324589.pdfIn PDF document text
    • https://doitoutdoorz.com/file/n7SAnuSPXM9b8OrI.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/32775206309.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/13540183201.pdfIn PDF document text
    • http://milkexim.ru/imgeditor/file/55060654465.pdfIn PDF document text
    • https://tivicom.vn/upload/files/wezumomesusefaj.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/f20753156fd4071a6d53f1f48d5317f4/lesebev.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3fc50c649---kafinuzito.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/92376174518.pdfIn PDF document text
    • https://livewireeventz.com/userfiles/file/66650181698.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/67972599028.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=chinese+political+systemPDF 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_off0000dd49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF560 10684 bytes
SHA-256: f7028fdab9d198c52427a5918b0c86f62437266e2a08f0f8aea55cef29a1ab85
font_02_sfnt_off00010dbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBB 20808 bytes
SHA-256: bfde18274ce15198f819428431e28017125598c62c52013850ea4bb349b58a68