Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b6e141560ff7b0d…

MALICIOUS

PDF

63.6 KB Created: 2021-09-24 10:00:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: cce7f4c19652272c665419dc0ccbf2a5 SHA-1: 8675480eea17679c45b01c3a52ffac8254184c9d SHA-256: 8b6e141560ff7b0de7cfd1f2786665ebcf00ac2658e7b0dcd45230cc393f884f
154 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external resources, many of which are hosted on domains flagged as compromised or disposable. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. The document body is unreadable binary data, offering no direct clues to its purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6960

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 https://lazdynumokykla.lt/userfiles/file/29485039169.pdf In PDF document text
    • http://naszymsladem.pl/upload/file/18627493801.pdfIn PDF document text
    • http://kasargod.net/uploads/file/wukavawujozu.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/kizupejajuxafuvikovom.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/vukewi.pdfIn PDF document text
    • http://760_709737661.mildmedia-dev.eu/uploads/userfiles/files/36246334226.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/xewexadevixapamo.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/49526735559.pdfIn PDF document text
    • http://yameitecl.com/ckfinder/userfiles/files/20210919_171148.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/qtvef50rscdht83qbbddhmjtr1/82889282775.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/56285665705.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/47267254281.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/dewekaxerererotesepifoban.pdfIn PDF document text
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/68344797539.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/85156874318.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/zepisikuxe.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612eeef16371c---nazumisowovolatut.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/betesikaros.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/pasekete.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/161416bbedf467---33753071182.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/40251402344.pdfIn PDF document text
    • https://businesslife.com/content/files/ramomidowe.pdfIn PDF document text
    • http://exima.kr/userData/board/file/80993858056.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=latest+android+operating+system+namePDF 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_off0000da44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA44 10760 bytes
SHA-256: 7ad76d66383ee19a8381aa1c18b45d4efcf7b4440b0874cb0d8b0e6cc3aabfcb

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