Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8065ac91f990411…

MALICIOUS

PDF

87.6 KB Created: 2021-09-06 22:49:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a6bb4b78286f5583a0871d9bc62841ff SHA-1: 7b78104ff203d5fd5f20ff66df6cc771b9a3338c SHA-256: d8065ac91f990411c6de5617b74b1de9bf7eb8465cbb1cbcd39bde5b85022bd2
154 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS uploads or disposable hosting. ClamAV detected this file as 'Pdf.Phishing.Trojan', indicating a malicious intent to phish or distribute malware. The ML classifier also flagged it as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6012

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://amghanoi.com/images/ckeditor/files/52899180018.pdf In PDF document text
    • http://school15-tyumen.ru/f/jakaxigokifuri.pdfIn PDF document text
    • http://sweden2020reunion.com/clients/e/e2/e2375cbe45a1e08e95d3a39ca41e84e3/File/56331305701.pdfIn PDF document text
    • http://jhsclassof63.com/clients/c/c8/c8cc7cee7579ddcd469b669c0eb172d8/File/25197155803.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/fenefomolodufudivofu.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/99635071813.pdfIn PDF document text
    • https://ancoraeducacion.com/images/69416635024.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/900350287950e3947a7688e7d365d7a2/77928099634.pdfIn PDF document text
    • http://redsky.tv/userfiles/files/26042650625.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c575cf50ead---lurotoruvaranokenu.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/42882679135.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/fetelotudivorazixim.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085773325dc0---rebodevukiwozeb.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/runujew.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16087860668b8c---24713877540.pdfIn PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/deduwevorogojarojogidonox.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/99105918437.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a809d5c0d43---tepogewinutibesabikixinos.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/bomipavewufinuxepuratoda.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16087cf7fe8046---39290392496.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160bb72de9ba43---suzugoguxoporim.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/wexutexibonu.pdfIn PDF document text
    • http://slesnick.net/userfiles/files/ledofixi.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/tejowixuresuwo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=poverty+reduction+strategies+pdfPDF link annotation
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/dovifodawafomofekimopit.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_off00012311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12311 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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