Malicious PDF — malware analysis report

Static analysis result for SHA-256 347cc5981f8d2356…

MALICIOUS

PDF

59.1 KB Created: 2021-09-21 01:26:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 88297b1c521f47bb93b2b8bead36ec04 SHA-1: 2a8559fe42d585da31faf3cf0ba46f2e82199347 SHA-256: 347cc5981f8d235676b01c0885f4bc7680713cca3da97081dd0d19ff72cbb79f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of PDF_URI and EMBEDDED_URL heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8279

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://krisoc.ru/uplcv?utm_term=tomb+raider+2+android+apk
    • http://profil-metall.de/content/uploads/file/97391560932.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161315173934df---84138505581.pdf
    • http://www.fishandcosolicitors.com/uploads/files/14055006933.pdf
    • http://sziszolg.hu/editor_up/xipekaremogadezixuwele.pdf
    • http://vektor-bezpeki.com/userfiles/files/puvevuwarokisipeluzoj.pdf
    • http://fcraregistration.com/UploadedData/file/kowapeledegu.pdf
    • http://wronba.com/uploads/wysiwyg/file/56060410338.pdf
    • http://muszempilla.com/files/file/jilerazunubojinonanomex.pdf
    • https://greenlandpark.com/uploads/files/66270464685.pdf
    • http://positiveforce.in/uploads/files/46742120409.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d77be7d07f---53972440123.pdf
    • http://neteyes.eu/editor_up/88942573879.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/161312538227f1---51426066494.pdf
    • http://ecme.site/2015/vat/upload/files/74292835792.pdf
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/2b351c255862d06183fa4eb03a5bf0f5/79004871055.pdf
    • http://designerhouse.ru/upload/files/saxos.pdf
    • https://ms01bet.com/contents/files/rozobakobajozidu.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16139e8a2380a9---woxagajetopiwojatapuvon.pdf
    • https://tssch.in/tssch/application/admin/uploads/file/jafefelaxodufunivi.pdf
    • https://ww150004.linebot.net/upfile/files/20210906015028.pdf
    • http://luijkzonwering.nl/image/file/nanebisivunefonumafepim.pdf
    • http://kleinschaden-expert.de/userfiles/file/24623882857.pdf
    • http://kapalishakti.com/ckfinder/userfiles/files/loziresubujek.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b44d.bin
0de178f1c2d3786b6d69da2e14ef4d1971c078510636bfd1df66993522277896		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB44D 19780 bytes

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