Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b15d53abb344a5b…

MALICIOUS

PDF

77.6 KB Created: 2021-09-06 06:02:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ee7341fe3abc2e904014d711dea407ce SHA-1: 937da62e5c4dab13b8a10624037e8c9499c429a0 SHA-256: 8b15d53abb344a5b74ca1bb8b3762dbe8deb5592c0f7d4f7c8c749729a9678dc
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. ClamAV detected this file as a phishing trojan, and ML classifiers also flagged it as malicious. The primary function appears to be directing users to external resources, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7611

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://nacyc.jp/Upload/file/noxivubigijog.pdf In PDF document text
    • http://attlas.center/userfiles/file/74673325500.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/gijuv.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/paxakomijitepana.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2e60701e7---67337299945.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/49544925514.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c64e76a4830---57478608236.pdfIn PDF document text
    • http://xn--lv0az70cxar.tw/uploads//files/202108111349524594.pdfIn PDF document text
    • http://ipmarketing.net/userfiles/file/64119111047.pdfIn PDF document text
    • http://web68s.com/upload/files/nofevufipakububib.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160fc479d8e3ca---13808642191.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/kozobugekagotitag.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/fee2ee6524e4c97ab17a02de5d3375f2/63400679735.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/xufutujekoxax.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/2e75680ef974c963d795e6029d36a0c5/97413218955.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e70fd1324---lisawetozofodow.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/9267217270.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/24353453614.pdfIn PDF document text
    • https://g55net.com/webpagebuilder/ckfinder/userfiles/files/32201072393.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad95618f6ef---pefima.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/dazitadiliz.pdfIn PDF document text
    • http://www.heksan.com.pl/file/63313619088.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=pdf+to+djvu+converter+portable+%D1%81%D0%BA%D0%B0%D1%87%D0%B0%D1%82%D1%8CPDF 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_off0000e5f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F9 11432 bytes
SHA-256: a020b35de6e6bd8fc8d272c54ee26068f5ea4b69b6b5045481db90fb9063e7a5
font_01_sfnt_off00010018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10018 22252 bytes
SHA-256: 0f27aad8a3f47cbef5ebb67b38b253477221cff55fafe3f58198e99c1ab49984

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