Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b4f1bff655125fa…

MALICIOUS

PDF

66.5 KB Created: 2021-07-16 07:05:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9259a00f7e565136665c9eafa44fae8d SHA-1: 20a6b43b95f34a61847ec0b6cd02bfba54f738a9 SHA-256: 0b4f1bff655125fa5408fbd23b1fefc46189fb005be4ada49fcc4133c04b62d6
154 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress sites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature. The embedded URLs are designed to lure users into clicking on malicious links, likely leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6525

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 http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a7212aca92e---22995751244.pdf In PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1608f87c92c368---kotunirufari.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/bdcede419e2cf607c83d7e6ffacb4562/sufotegedotenozomok.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/sh278dd3a6r8999b4bh77e1ge7/duzezurovapi.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210623173333_sw3og2.pdfIn PDF document text
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/20f83cd9bf3abbbe68ce5366cec7efe6/90174812417.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/4eeec1272c68582f23807d6c2cb2a171/36751297673.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/d0808cb90edb43769e845b164d934575/sixeguruxezijutugozix.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/pfble1g9lm0hggghqg7mkag7h0/81081123005.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/gawefave.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160858502359ae---60612412675.pdfIn PDF document text
    • http://zerosquareonline.com/file/revoripibemozipojira.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c5dfa62518c---makagazu.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/rifiwik.pdfIn PDF document text
    • https://madopin.com/calisma2/files/uploads/girugo.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/b6fb37ddaa4bbc0c8e9b63b36f7ed19d/winoka.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e372491dc---16766726080.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/rokusegepokozafuwezuza.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/zivixiwisorezokiduxak.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160797f2375e76---16343327952.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/nizexivazexosawo.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/vabunitezigowututige.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/e16b7d5d0b655e54a2dd2eff713100f2/21060113331.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/374b4fb276c63095146a8e1c950daa7c/16973810656.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf210e161d3---81195609967.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=principles+of+accounts+o+level+notes+pdf+downloadPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF56 15760 bytes
SHA-256: 1853d7ec5037322664fd3727bebe8ba545cc99562ab599d0f9fa1745d281a9bd
font_01_sfnt_off0000e7ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EA 10864 bytes
SHA-256: 741dcb529ec2a5a8b4b9c863c915dabd6359da137bcf84e85078c52c75ccaf17