Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bf76f9b5cdc76f7…

MALICIOUS

PDF

79.8 KB Created: 2021-08-09 07:46:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ef63d629c5ca8b51415b55ec109443e7 SHA-1: 82a0334eb6640f005c2b2dd31d80446f0e952dda SHA-256: 7bf76f9b5cdc76f73a20fe2ef6aff3a0fba6ac3acda573e08fdaf87a5f20db27
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. The embedded URLs and link farm structure suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8488

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/ptfals4qpa0ivd0fpij3h506mc/woweto.pdf In PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/de22f746f4020650f14b47dc97ceaa58/28602445264.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/mopogoxojipojilivap.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/8ad770ee4c38e486cc28bd4443ea7efc/sugibexivedugixiz.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/vupizefesug.pdfIn PDF document text
    • http://capital96.com/userfiles/file/95928279514.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/bsm5em9gdkmg99km1celvvgssb/95904674482.pdfIn PDF document text
    • https://quaint-house.com/images/blog//file/xetexogikulepudajetewut.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-14/20210514032417596242.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/1de024e5b6523d84cae2bb2ca387286d/68888286835.pdfIn PDF document text
    • http://web68s.com/upload/files/gejuzuzujatewipolatele.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/82246821610.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c46f2171f---85937883691.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/nunixax.pdfIn PDF document text
    • http://acquadiqualita.it/ckfinder/userfiles/files/rixafiwisuvewusite.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/naxikusinoguxiv.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/77331309979.pdfIn PDF document text
    • http://kleiberit.ru/files/file/8049887949.pdfIn PDF document text
    • http://tbm-mova.by/images_from_html_editor/file/60392226376.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/jisil.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a560a403304---dotibokigore.pdfIn PDF document text
    • https://dineflon.com//files/48856101990.pdfIn PDF document text
    • http://temple.mo/userfiles/file/28193605615.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/86535a3614e1f455bc8c2cf348f5cf74/wigesoni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=how+do+i+pass+my+road+test+in+georgiaPDF 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_off0000f9cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000111e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E3 10880 bytes
SHA-256: 1f7c9c8bcc0f6ece44e37e537ba983ff9035169ee4dcea3c3509335956bfaab5

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