Malicious PDF — malware analysis report

Static analysis result for SHA-256 1537f9c37f0fa373…

MALICIOUS

PDF

60.9 KB Created: 2021-09-05 10:02:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 87a16551e725b558c3b5fd49cd3522f0 SHA-1: ab09f165987e86b45c223e0b2a58c2cfbd611c06 SHA-256: 1537f9c37f0fa373a8301a94d799e738cc0da253c1a9776a3815bc7fb1c17495
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these link farms and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6618

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://ebal.ro/app/webroot/files/userfiles/files/zalosubij.pdf In PDF document text
    • http://hbisan.com/userfiles/file/30745082372.pdfIn PDF document text
    • http://bangtutrang.com/upload/files/31302434304.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/kigejorotojebuwika.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/37779137942.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/4f5b1e7676130a904f3e38cc818747d8/90264059752.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c27170c30c5---31869888181.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/76egjesrlhkqguumi4jobasj0g/jodulizova.pdfIn PDF document text
    • https://lanegarrett.net/userfiles/file/woxalituxerewuwa.pdfIn PDF document text
    • https://coil.hk/upload/files/35957276412.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/16256204649.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/61703346020.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/digiba.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf4e9e52993---nedagijipupone.pdfIn PDF document text
    • http://aczelzalog.hu/tmp/muwugogapifodufunuli.pdfIn PDF document text
    • https://arzhosting.com/calisma2/files/uploads/lixeril.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/rf7786341kdai2djjtrnd4f4u4/xokixesona.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/tojil.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/derofuj.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077683d409ed---85108946281.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/66149896320.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/oaj97grhfpmvc60fle3uu2b3l2/votugesoguzinuku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=sony+srs+xb21+speaker+manualPDF link annotation

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