Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea0560e6741b616b…

MALICIOUS

PDF

72.1 KB Created: 2021-09-02 20:26:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 23b5b3c25259f5e39b8b9b69c3394c68 SHA-1: 5ecddc0b37819f407b97274767c2e7df7d30f7f7 SHA-256: ea0560e6741b616b74f2634d0759d6a140ee51a35e623421d6a69861e78cdfb2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm designed to obscure the final destination. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests malicious intent. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a pattern of distributing malicious content through deceptive links.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4060

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 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.
  • 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 https://www.adom.biz.pl/ckfinder/userfiles/files/29871329775.pdf In PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160abe787a2234---87880920862.pdfIn PDF document text
    • https://literie-depot.fr/UserFiles/file/78872712971.pdfIn PDF document text
    • http://ore-processing.ru/d/files/56976278800.pdfIn PDF document text
    • http://galgalesh.com/userfiles/file/fupogidawagudidoxu.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16078379cceafc---43405881828.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210831130242232.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16125e3ba9aa4c---69065077880.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/h4l4lla43s6vcfb6nqi309j7k0/41526553678.pdfIn PDF document text
    • http://elitvorota.ru/f/file/zevinopalilubizusubagapor.pdfIn PDF document text
    • http://melinterior.ru/userfiles/files/43049882282.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/h5ejgj35lsqrvn2c197im546ju/45397841117.pdfIn PDF document text
    • http://ledesmasportsmedicinesavannahcentury.com/clients/4/44/449a5b3489ef279447e90cf6cdd72f1c/File/josivepovabadasa.pdfIn PDF document text
    • http://splogservice.ru/content/file/23154823865.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/naxumilutuvovifo.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/15267335468.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/dc014356bb39c1b701237be629e4f2d6/xemakosadivujugo.pdfIn PDF document text
    • http://starinviter.com/ckimagefiles/89094454537.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7e7a582bc---88190937921.pdfIn PDF document text
    • http://hotelstrack.com/bot/ckfinder/uf/files/56548594525.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/36762174598.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160909f0f04c71---gijadax.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/ffbb6145f7333293bb2e16697e08fd37/faluvewovar.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f93362547---gasamowum.pdfIn PDF document text
    • https://basisnomor.com/contents/files/tokibipewusevirifam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=arrays+in+c+language+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_off0000d30b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD30B 10772 bytes
SHA-256: cb57cab34ab52738e0608e5785ce6fab294aceb64a898365f9156e5ba1895e6b
font_01_sfnt_off0000ebc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC4 18188 bytes
SHA-256: 72bab879eb5a205e9536e27c6fc8f2624b02155734dde70314b38fb241f6a4e3