Malicious PDF — malware analysis report

Static analysis result for SHA-256 db71ee4152154681…

MALICIOUS

PDF

40.1 KB Created: 2021-07-06 22:52:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 550ff44a49aa6ed97486eac7a55689d4 SHA-1: 479ff6a22916285bd1eb7fcbb97f21210eac718c SHA-256: db71ee415215468149d433fd14d74177e9ec7946204648115c29cddb7bbb0a9c
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and uses an image-based lure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9743

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 40 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://nomylo.ru/uplcv?utm_term=how+to+draw+shoes+step+by+step PDF link annotation
    • http://okwmd.com/upload/fckeditor/file/jufuba.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/nugipafele.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/64b495cf5b5b67a0219faf50f2d9e4ef/sewasatizawumexip.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/jitovugulop.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa87f15ca9---lupeburasisozusovexav.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/71936613562.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/watarikodorevelodarifi.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/e2940691343c9fc1eb2f33af528eb461/21383639194.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/59202035817.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebb8998e85---49180346366.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160867451cc5fe---6105998991.pdfIn PDF document text
    • http://blessedfamilycovenant.org/clients/c/cb/cb727bc273eb4203dc66fb73741ae5ae/File/42752767086.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2bb06b3bb6---46891137566.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/katejusodan.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/zudasubotumebavibug.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/90441124770.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/4f7234119b8f29bfebcbfd8fad11b172/61859278232.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160755a8acf047---99748687007.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c35016800ed---bugawigotezanosaw.pdfIn PDF document text

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