Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca496485ef63bf24…

MALICIOUS

PDF

90.5 KB Created: 2021-08-10 13:05:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5d89149c9836f0995f307a8b042d53b6 SHA-1: 8d0d0b2106c327debc9cbb3c5ee368c17a7ebbb5 SHA-256: ca496485ef63bf24b396162a6eb451d89243c666e92099f3bba7d4cd4cbe8404
154 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to disposable hosting or compromised CMS uploads, indicating a link farm designed to lure users to external sites. ClamAV and ML classifiers identified this PDF as malicious, likely a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8889

Heuristics 5

  • 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
  • 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://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/6fc0629864849adac82a34fa1deae913/69701480424.pdf In PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/jijuwegeteromimopaworalin.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/fomagufuguzin.pdfIn PDF document text
    • https://raptiherbal.com/ckfinder/userfiles/files/14430231617.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/76945404471.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609be26065791---sasevotaxufaxig.pdfIn PDF document text
    • http://sro52.ru/uploads/files/vopemigugubiv.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/5asf9mo400mqpteb2ud6jblf4q/39666566306.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/d6i3j7qgg7bmls160rtd92suns/tepipusujuvebebezovob.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/lowugibo.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/qjui90tk9ljdqsgrpr2cnc8io1/8887643584.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/28461863128.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/97435645405.pdfIn PDF document text
    • http://apartament-krokus.pl/userfiles/file/jonunolidefugekuda.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ade6ce5ca1d---kidenanoleb.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/tefox.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/45e973062ee38e6c3e77a221bd961efd/nubasezoro.pdfIn PDF document text
    • http://klimagra.pl/images/wysiwyg_img/file/89596850365.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/16lbjt9vas0ifk4c1vgvbrkose/9512422751.pdfIn PDF document text
    • https://arerp.kr/data/file///bedozefojunibetezopokuza.pdfIn PDF document text
    • https://magatek.com/documents/file/6013902441.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16079ea457c051---buzitumipudu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=upgrade+android+10+oppo+f5PDF link annotation
    • 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_off0001469d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1469D 10676 bytes
SHA-256: 5594c4e84ccb8195c787665aa04a519e968e3184584af78543b117162f42c047