Malicious PDF — malware analysis report

Static analysis result for SHA-256 846b5e1fd419c67d…

MALICIOUS

PDF

81.0 KB Created: 2021-06-20 09:21:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: b203e8f7176c4e081341e1a0837ed39e SHA-1: c9de14cec24204d9bc2b2dd2328b325485c01ae1 SHA-256: 846b5e1fd419c67d09d26df530ccb1c50053a8c2fd639ca811ce0388a0dc526c
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm used for phishing or malware distribution. The document body, though heavily obfuscated, appears to be a lure related to search terms, further supporting a phishing or redirection attack.

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://philabc.ru/uplcv?utm_term=words+to+describe+someone+that+start+with+k PDF link annotation
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/932d528ad6d7e88974065f6155014590/diwodurolabonakepawabina.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/1465198391.pdfIn PDF document text
    • https://mimpishio1.com/contents//files/rorowisagojapi.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/6pb30s7dsj2m6r0n898d0irku3/96352304376.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/87956863314.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607daab3c6953---17544755349.pdfIn PDF document text
    • http://shosholoza.de/file/zowisuxupivo.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/cda1f2827371461ffac0d7b87ad60c29/vutakepusodures.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/28792373842.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160709a93732a2---35572791233.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/mugikifizobarivotepet.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/sirimetixaverudupudifogal.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e23396841---jepusuka.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160adb0d16aaae---zimukov.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/siviketominegow.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/10dc84ffa0733ec6fe30f045c24f5c44/86097864831.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c38635b1d7c---simipi.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/3c52e0d0713341a8b4d2d71aece14304/nomuzovibosej.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/71962130757.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5F 5456 bytes
SHA-256: 7c7a538fdcd02b3c39902d7e7e9579947eabbd800c69e6deaa28c82da823a106
font_01_sfnt_off00010fd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD8 10944 bytes
SHA-256: deb2ea80f7f647070fea9b53d639a2034b6ff1052f67447f17fb27d1994f53ab