Malicious PDF — malware analysis report

Static analysis result for SHA-256 557f8509852d46b2…

MALICIOUS

PDF

85.9 KB Created: 2021-09-21 23:08:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0b5d4154de3de8b0e99010d8bfc2b43d SHA-1: 68ea42feeb8859237db9f6ce5f5ce51c09ec6da6 SHA-256: 557f8509852d46b2845f97f0a2b7dfcdfc3a12b98674e4974198984e35bf7f72
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a Pdf.Phishing.Trojan signature. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to lead users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier clean score 0.2404

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 https://chcial.ru/uplcv?utm_term=streaming+friendzone+2019+full+movie PDF link annotation
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/567b6b4a8a83a3557261202ebea3b1ca/mefiwazakiwabegomipigopa.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/hgndreru5mhb31g61anmnr9tjc/kawuwevoxu.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613da3d2e253a---79805333680.pdfIn PDF document text
    • http://zmz72.ru/files/file/vexopiveresazoximubafipud.pdfIn PDF document text
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/85390283356.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/ledemuzib.pdfIn PDF document text
    • https://servauto.fr/img/user/file/narunabofubuwedawif.pdfIn PDF document text
    • http://3gr-group-com.gbintl.com/ci/userfiles/files/51149791459.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/23958945786.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/zixalufepaxigegot.pdfIn PDF document text
    • http://solo-reisen.com/media/images/file/sifovogolexokamanodavas.pdfIn PDF document text
    • http://grabnerestriche.at/58930439114.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16140f4a24bbd8---94227061818.pdfIn PDF document text
    • https://arerp.kr/data/file///73336979893.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/nogeripigezufuvemejexeni.pdfIn PDF document text
    • https://ofcourselc.com/admin/uploadsfile/fazexuwibisefanajo.pdfIn PDF document text
    • http://computerdoki.hu/user/file/daxomar.pdfIn PDF document text
    • https://artbynela.com/uploads/file/fafulafujum.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/ximexelivubadiga.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613f15d9f1d3d---5676971761.pdfIn PDF document text
    • https://dyaa.club/uploads/file/1756583656.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/13139281399.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/meriravudumumeter.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/loropobov.pdfIn PDF document text
    • http://hwayoung.kr/upfile/files/navupupim.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/98347029348.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA31 11292 bytes
SHA-256: 697bf0d0f0bb1acac5df7b1c15db03e969d99eb5ba9c473ca418048b5ee5e312
font_01_sfnt_off000114ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012cbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CBE 18124 bytes
SHA-256: 0c5447c8a1836583848da7591fdbb49d85ccb8eb3b3a26a0411c248bc591e44e

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