Malicious PDF — malware analysis report

Static analysis result for SHA-256 281afd1c8d3305a5…

MALICIOUS

PDF

73.7 KB Created: 2021-06-13 03:02:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c42cdec328c371dece4a65af634ee1db SHA-1: 36333228f55a591f1621e6ac51f692af876b644a SHA-256: 281afd1c8d3305a537ffc265041865853720cee779217fc5acad668a7eacbdaa
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The presence of 'utm_term=extreme+hack+cs+go' in one URL suggests a lure related to gaming.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9402

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://infrive.ru/uplcv?utm_term=extreme+hack+cs+go
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096ad1d63c65---takenapama.pdf
    • https://deniz-sogutma.org/img/userfiles/file/42593626391.pdf
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/ceb325d91862a2117cb70363b1d9c2b4/desumusuruzifogogunos.pdf
    • http://kashima.cc/userfiles/file/tejixexexike.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ebb2564ba5---xidive.pdf
    • http://kondicionery-lubertsy.ru/upload_picture/file/21725996793.pdf
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/ul38j6jd7t4mr8phppsvhe4fh3/33488775458.pdf
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/711b3eb74915c9812c06f829542d3753/piwaxumamasujimu.pdf
    • https://akapacha.com/userfiles/file/xevokome.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed2ae36142---16397927369.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/vbh3gfu8u2u0agdhq8g1j6dnn5/wekuzexonexipusudu.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b9dcc24af7b---derak.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160730b9c3adaf---66243697920.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16076c8b285b6f---wobubepid.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f22e.bin
8fb670a68d3b3dc06cc62cf38897bcbcbcab30b03f64f1c2821bc1cb9d7f7697		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF22E 5268 bytes
font_01_sfnt_off000103ec.bin
49dddaa543544930169c80d10742cf71a10a90771d945bdf421e53748b1fa594		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103EC 2140 bytes

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