Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8358823c292445c…

MALICIOUS

PDF

81.1 KB Created: 2021-07-15 17:23:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0f4ea31eb7d5b1b399482c3f565a0f8a SHA-1: 37c1ade22811c2a6bd88e92e6b793040c8548e0c SHA-256: e8358823c292445c677b7d5b542dad772ed30440675dfc31db8bf579d9a4b56b
154 Risk Score

Malware Insights

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

This PDF file was detected by ClamAV as a phishing trojan. It contains numerous links pointing to compromised websites, including WordPress installations, suggesting a link farm designed to redirect users to malicious content. The ML classifier also flagged it as malicious, reinforcing the threat.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5347

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://archism.ru/uplcv?utm_term=derivative+of+complex+function PDF link annotation
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160728ed86922f---55864158789.pdfIn PDF document text
    • https://areicon.com/images/file/58912852092.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/svdhukcfnpi6ue11rgkv6vv0j1/81739948363.pdfIn PDF document text
    • http://fittbike.hu/files/file/lifafuruva.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/e6af19e6cc233f46d11bde1e1f8fa0b8/16665852766.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16087646cb4f93---kenavelolesawanumibogasat.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/17b8613d28ee8373164ff6f370648185/51107674858.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e97c61663---15694619124.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/69914423745.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084aeea1ca4f---kalapodafadokukadurajales.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607f84f7d0b3e---67308269902.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609af10c3be6e---tijewesifefureb.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/119fc9f644c2c3cd1c6f9e9fa2582cc1/zirerowuk.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/97913942244.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b62030b5b99---dadokubimozinoxewekizem.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/86749769572.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d6fd07b06c6---95492642118.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a823a966b60---fuvivazaraninibenuladonu.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609113c096eae---67073375581.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/fupemiwepavodipokaj.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c676e223a89---63389257564.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/revofaporafi.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_off0000e7e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF5 17452 bytes
SHA-256: e5dc36aa795ef3c8792f006144a6343f586a552fc556e250fc66e0d40738367d
font_02_sfnt_off00012db7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB7 10744 bytes
SHA-256: e070a02f8d060118bd01f3456db6649c1e54b5ef477bcfad3388782f2d48c79e