Malicious PDF — malware analysis report

Static analysis result for SHA-256 087b18fc924762aa…

MALICIOUS

PDF

73.4 KB Created: 2021-10-06 13:22:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 2bcb6461407e9281e901b369d4b7825e SHA-1: 6f7b250a95e8899a6c43c18d6c5be9d34f3b9f1a SHA-256: 087b18fc924762aa8f016b5910ad90848e3f6c7c0b2fd48099c27854fcfba158
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier further indicate malicious intent, likely for phishing or malware distribution. No specific family could be identified, but the techniques suggest a common phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6611

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://sparkpro.lv/content/file/zoxubajemupa.pdf In PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614824d128aff---35592894439.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/xupuzita.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161537f702008b---44929571758.pdfIn PDF document text
    • http://sensi-leszno.pl/userfiles/file/xuvow.pdfIn PDF document text
    • http://falerisztika.hu/tmp/52327667482.pdfIn PDF document text
    • https://coevent.ru/upload/files/xuzobizelazanimibokokibez.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/dolevasenuzibizunuja.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/joluwidarawidisugor.pdfIn PDF document text
    • http://deleeuwputten.nl/site/data/ws/files/dejobagomezok.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/peradarojejemudinotox.pdfIn PDF document text
    • http://wideanglepackaging.com/ckfinder/userfiles/files/34610598198.pdfIn PDF document text
    • https://wita.lt/images/files/98389377058.pdfIn PDF document text
    • http://globalsublimation.net/uploadfile/files/48291563943.pdfIn PDF document text
    • http://autostyle-japan.com/js/upload/files/losokimegimosej.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/poditiwojegi.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614090e0132a0---wopedategurifujakos.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/warofepovutit.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/57018662288.pdfIn PDF document text
    • http://hardiebase.com/uploads/assets/filefile/visup.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161449083a67e8---nalexozonep.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/2102566500.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/19029864132.pdfIn PDF document text
    • http://goghepcacloai.com/media/ftp/file/48317846188.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=9th+grade+comprehension+passages+with+questionsPDF link annotation
    • 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_off0000ea1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1E 18064 bytes
SHA-256: 7d34d764b4fc9f600ea1e2c2f5f0a2dbaa5cbcc925f0a9b23ae706876684d5d2

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