Malicious PDF — malware analysis report

Static analysis result for SHA-256 46e41c3dd9d1389d…

MALICIOUS

PDF

82.8 KB Created: 2021-06-23 20:54:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 02c6906fce84531af4ce3a33cd55e60c SHA-1: 1f93312e4a21ddddce49d48f4c8c188a29be10c7 SHA-256: 46e41c3dd9d1389d383d2d7b20824e1be7bb240f886bb08040cac062728d068b
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/58a64fc035a7fc4c698ce8fe96ee4032/86759399781.pdf In PDF document text
    • http://mextro.de/upload/files/sugejod.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/dajezazubi.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/32009802547.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/c739d7cf0d62d51f60c7aced809954f3/tozopanezusifemetagopore.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/vi52r8nmkd6vos5s41mll6pek7/bofoxodogibamez.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/f5510psoe124ll9hejj60hqut2/bozavaroravesaperafukog.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/09ufrorkmbb6n1bf8praphdkje/57462406791.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/949bdba7a41b4c6c658543b6501e142e/23322388435.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/im6gtb4tqfg0d9kqq5q5eisi51/befugesutumerusadesowofo.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ba44272fe---tipeviduxalonir.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/mebabeb.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609410583cdfd---xadus.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/warikutegezogowawix.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/3cga05v6g4c4l5j1k2q17novlr/vetesexi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=protocole+de+kyoto+pdfPDF 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://scripts.sil.org/OFLIn 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_off0000f542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF542 4928 bytes
SHA-256: cf25fc15a33a6496320e81e83729bfb69f4fbfbc16d9db8d9c11f000237b43f6
font_01_sfnt_off0001062a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062A 10220 bytes
SHA-256: e4b436fb9290b651abad303094cfa39e24450bd6b62ca5b7d27c6001be0a2ab7
font_02_sfnt_off00012907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12907 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15