Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1f8aa699a9fe140…

MALICIOUS

PDF

83.1 KB Created: 2021-09-06 23:06:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 39eea9916e166d5a2f6024ef3edb187b SHA-1: 93db2a1008f7394794f1e2b123d868ced2fee484 SHA-256: b1f8aa699a9fe1405ea0c8b2c24a3addc6ec7b8f4a8031e9b7e45aa2a20f0cae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous URLs, many pointing to compromised WordPress sites acting as link farms. These links likely serve as a lure, redirecting users to phishing pages or malware. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea2ffc8a3c---93556937514.pdf In PDF document text
    • http://tonioloclaudio.it/userfiles/files/rumafedosoba.pdfIn PDF document text
    • https://ayurvedaemart.com/uploads/file/wemekufulosakogexoz.pdfIn PDF document text
    • http://119pump.net/d/files/12358437074.pdfIn PDF document text
    • http://northstarbaptisttyler.com/clients/a/a4/a4b4c2e389351fb2dee96c3f727c6a57/File/90958829842.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/16f66f28eac24c51f4e750ca6f21f1b3/47559015893.pdfIn PDF document text
    • https://yunglin.com/uploadpic/files/xovuvafiremuzefusun.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/tigikanoxesedirijin.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/katorufus.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/652aclpret2l9fogvjkqcfvuo5/fefivupakab.pdfIn PDF document text
    • https://asiajitu.com/contents//files/pepiwo.pdfIn PDF document text
    • https://mimpishio1bet.com/contents//files/75047939730.pdfIn PDF document text
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/wowof.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/juseletonutopudo.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/xovarijazagopovexedegub.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/35418673937.pdfIn PDF document text
    • http://xn--j1aii.su/userfiles/file/wibiputowuxefibeb.pdfIn PDF document text
    • http://parentini.it/userfiles/files/94184930086.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/livurax.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/20218261227135825.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/48c44ba7a616cd27325525120ad7cac7/22154543629.pdfIn PDF document text
    • https://weboonline.com/ckfinder/userfiles/files/30825657073.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f543a590b6---53232172929.pdfIn PDF document text
    • https://air-separation-supplier.com/d/files/dulibibidudoxegopu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=resistencia+de+materiales+beer+pdf+descargarPDF link annotation
    • http://irodori.kir.jp/files/file/joleru.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_off0000dabd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABD 19492 bytes
SHA-256: 4574386e1cce0deac30ee4dd4c6a242d2060c4b28321080c107464df4e212731
font_01_sfnt_off00010cb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D0 11028 bytes
SHA-256: 6ea8f2f07c01e7ab5772b2c701cde832db962d63681cbdbad186bf0132cb8755

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