Malicious PDF — malware analysis report

Static analysis result for SHA-256 30f04893882f1fae…

MALICIOUS

PDF

75.3 KB Created: 2021-09-19 21:54:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5b6d83a3c27d981e4de187b6a13d4295 SHA-1: 56d0a0a4be9e1f28453ef2ca7353d2fdeec20ff1 SHA-256: 30f04893882f1fae956e8c79fbc74bea655c7f4986385b0a094024bae47124e5
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The heuristic firings indicate this is a link farm designed to redirect users, and ClamAV detection confirms its malicious nature. The primary attack pattern involves luring users to external sites, likely for phishing or to download further malicious content.

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 https://coretry.ru/uplcv?utm_term=adjectives+that+start+with+letter+w PDF link annotation
    • http://upoart.com/ckfinder/userfiles/files/xekotelu.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/janufevupigofedediwawali.pdfIn PDF document text
    • https://edex.co/userfiles/files/1457564882.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/duoarqe24ad1ibumbbjfoj1sj7/forurasegebenu.pdfIn PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/woverozavurudig.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/jobugivegadorirakudavev.pdfIn PDF document text
    • http://nhasachconggiao.com/luutru/files/7520988602.pdfIn PDF document text
    • http://aven.su/userfiles/file/jazibu.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/81431488241.pdfIn PDF document text
    • https://billionbosses.com/ckfinder/userfiles/files/silukozisomawezumoj.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16145c10e8cf98---20511001332.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/rilenini.pdfIn PDF document text
    • http://akvatoria.by/UserFiles/files/lafavex.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161448ec23aecc---wirixawofof.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1613cbf795b460---nijerajudutanibexovu.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/65065450171.pdfIn PDF document text
    • https://concurs-euclid.ro/upload/fck/keraxujepobegaxot.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/34071952209.pdfIn PDF document text
    • http://tauroconsulting.pl/userfiles/file/senusubijaxunogorenegekis.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/mites.pdfIn PDF document text
    • https://rozynoklinika.lt/userfiles/file/95809132954.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16131fe9262cf3---43495549416.pdfIn PDF document text
    • https://33mobility.net/uploads/files/mivazadazinafumu.pdfIn PDF document text
    • http://hanyangsteel.com/files/fckeditor/file/1942311547613a4a4a4084f.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/55268275715.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_off0000c450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC450 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC67 10508 bytes
SHA-256: 7d83b18b0c55699a877da2c2229f3970a1936a3b33e04ce13a6ed06dde1b4900
font_02_sfnt_off0000f473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF473 16636 bytes
SHA-256: 683d4fdbdb999e886390ac7bd7aa22b4a7132b961a9d3185a6d7b0daa4042302

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