Malicious PDF — malware analysis report

Static analysis result for SHA-256 396317c7a90aa143…

MALICIOUS

PDF

41.5 KB Created: 2021-09-16 08:48:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c53dc8f07057b1a3185fb5bed0c50a1b SHA-1: 7058abe48417b1a08c492fd36a04bdb105e4ae6d SHA-256: 396317c7a90aa1431c15d521ff5cad130104a5a100faa5d7a82aa8f7265704ed
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a phishing lure. It contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to distribute further malicious content or phish for credentials. The document body is heavily obfuscated and appears to be a screenshot, reinforcing the lure tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7777

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 41 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://crysiq.ru/uplcv?utm_term=create+guest+account+android+phone PDF link annotation
    • https://myshalewell.com/userfiles/file/81888701742.pdfIn PDF document text
    • http://senvietsystem.com/ckeditor/upload/files/noxarolasadoveximono.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec59875ff9---zatine.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1eaed418d---fudugi.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/vobilutetubi.pdfIn PDF document text
    • http://quangcongluc.com/upload/files/bofoxumajoditeti.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/zipawub.pdfIn PDF document text
    • http://bjavc.com/filespath/files/20210916111811.pdfIn PDF document text
    • http://rsti.biz/files/fck/file/gonixironin.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/tukagudopulasepavupenu.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/20980959076.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021090411013027.pdfIn PDF document text
    • https://mantyobras.com/userfiles/file/pudojefufujinal.pdfIn PDF document text
    • https://psihodesk.ro/ckfinder/userfiles/files/40500536164.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/24641495869.pdfIn PDF document text
    • https://kristaldicarlo.com/userfiles/file/24874536362.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/53442674333.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae8a4dfce0---sujurugugefuf.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/10937727898.pdfIn PDF document text
    • http://hzaidele.com/images/upload/File/lejigek.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/88251103546.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/20dfad927cc35eb8a7b5f827fcbe46b4/mexemojizesuvuzeb.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/15044834915.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16130021b9b0d7---vusaxuruwiwa.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/puletenokevosefez.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/jobaxipudodoputebomosajo.pdfIn PDF document text

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