Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1c847bdf65a6f78…

MALICIOUS

PDF

63.5 KB Created: 2021-09-16 04:11:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3319351c88a069fb7db5f4f457ad8ad8 SHA-1: f38e912ce8a3d38cf6afff90efa85fa5047f6803 SHA-256: f1c847bdf65a6f78d6107e1711a4c24106e7c0a05ed62437fc0bd9316e5cbb3e
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript and numerous external URIs, including links to compromised CMS uploads and link farms on disposable hosting, suggesting it is used to redirect users to malicious sites. The primary function appears to be directing users to external URLs, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6902

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.
  • 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 https://medvor.ru/uplcv?utm_term=water+detector+apk PDF link annotation
    • http://rrbrentacars.com/files/others/muxojavobe.pdfIn PDF document text
    • https://www.nickelmarket.co.za/includes/ckfinder/userfiles/files/23522270045.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd2cda44a2---96122299942.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/gipikujusivi.pdfIn PDF document text
    • https://basisangka.com/contents/files/dowavanozowagetoruriduxe.pdfIn PDF document text
    • http://finalstage.biz/js/upload/files/femuwazil.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/78395926240.pdfIn PDF document text
    • http://neogmbh.de/www/sites/default/files/userfiles/file/4786579357.pdfIn PDF document text
    • https://ka-base.no/images_content/file/74359677418.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/17135228746.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/60202816844.pdfIn PDF document text
    • http://damutech.kz/upload/2021/09files/210908045352614185wkoy3.pdfIn PDF document text
    • http://www.gpe-el.pro/ckfinder/userfiles/files/21584835308.pdfIn PDF document text
    • http://nbmounts.com/userfiles/file/1630756676.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce43ca98dc---nemuba.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/jakakofowilu.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16140e59f0719b---xazogugugunojinopemamog.pdfIn PDF document text
    • https://1tlstar.com/storage/uploads/files/rifolevunenerawepixawor.pdfIn PDF document text
    • http://ukrfirework.com/images/file/ligigaje.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/0c10d3cda1b36f2bd12b7d99d0b3358e/bitinozizujarafubizujikir.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/52212287222.pdfIn PDF document text
    • http://eternaseguros.net/files/files/65743315195.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/28934671171.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A3 18288 bytes
SHA-256: f9f90813c67c79f3778d49e27cdfc6e29e84037995f2a401472d27626b375ad1

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