Malicious PDF — malware analysis report

Static analysis result for SHA-256 875ae06cd8448fd7…

MALICIOUS

PDF

73.4 KB Created: 2021-09-08 11:24:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b3aed8293163a495f6dfa0acab65929b SHA-1: 48a155009851c92762b71a0ed8d9e450e58b0e22 SHA-256: 875ae06cd8448fd719c57589a55ed2489560d1a1d795c9888d21c2fb8c35bdc2
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and numerous links to external PDFs hosted on compromised websites, suggesting it is part of a phishing campaign. The embedded JavaScript and link farm structure are indicative of an attempt to redirect users to malicious content, likely for credential harvesting or further malware delivery. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8257

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://edeins.com/userfiles/file/nebezejekiz.pdf In PDF document text
    • https://www.agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/xowafoma.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/5243256163.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/12172896912.pdfIn PDF document text
    • http://48bulls.com/js/upload/files/55953549365.pdfIn PDF document text
    • http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/lifevewovorosefufo.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/jefazefewa.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9ee528530---peruwezetuf.pdfIn PDF document text
    • http://timnhanhonline.net/upload/files/delizefujanesomexuwar.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/tiguzenududijova.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/famelizekukirupajulubo.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be54629c517---zalokozo.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/ae92c2387e658df144b79e52a6f20d56/72903421379.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/kbcofqbd9thh8gc1o3g8gal8i1/joxumenixesogijolixobebu.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/13625981186.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/wavogemexenenozer.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160909795a6392---92671110357.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd8c9a9245---sigimovefupi.pdfIn PDF document text
    • http://artattack-concerts.de/files/file/56886058581.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/31020470024.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/girivixuwomegev.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/fofinuzezatiges.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/d6889891e04c3b8c8035f4756c59b2e6/weporidejamugikuvijotit.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae6b6239bd---wulexufuloxida.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/17962835290.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=types+of+syringes+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAA 17308 bytes
SHA-256: b4b0e94f060d6ac042bc4b758eb8007351e23a25611c1c47c415a3486674c613
font_01_sfnt_off00010c13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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