Malicious PDF — malware analysis report

Static analysis result for SHA-256 511c403c3b5516ff…

MALICIOUS

PDF

66.5 KB Created: 2021-09-17 20:53:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c6481b44437ca48cb739dfb2567df9c5 SHA-1: 5e93024b2a2ec3fd6921b4032d70a9cd48319deb SHA-256: 511c403c3b5516ff2db86a06cfa9441fa78b9c6834f7ec484269776335b132e1
154 Risk Score

Malware Insights

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

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to other PDFs hosted on compromised websites, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farms on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6824

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 https://coretry.ru/uplcv?utm_term=app+to+crack+wifi+passwords+iphone PDF link annotation
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ef6fa6850d32b0305220cd70a621ed56/44547421211.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c48683ef5---41713432991.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8c922eda0---zufagisaxeju.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/falurejexuv.pdfIn PDF document text
    • https://used-machinetools.ro/app/webroot/files/userfiles/files/46196207835.pdfIn PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/21945421806.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/mubufo.pdfIn PDF document text
    • https://ms01bet.net/contents/files/68902684464.pdfIn PDF document text
    • https://tp-pos.com/uploads/image/files/45848327321.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/savemigut.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/relenikevujubilewamuja.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb15bb9c4d---72707209915.pdfIn PDF document text
    • http://giga.sk/storage/file/kikorogexinorenuretuzaw.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rusugew.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/tewawugilodifuwawori.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/87647468532.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/87944072012.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/zajud.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/b91be4d0769d399046b4d236278f7131/61717441699.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/sovabib.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/niwusib.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/batixopifabesafip.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/5446186658.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/161410782bfe9f---ziroruvugiwegojekob.pdfIn PDF document text
    • https://indoshaolinkungfusociety.com/ckfinder/userfiles/files/50803691538.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_off0000e042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE042 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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