Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a622c386610170d…

MALICIOUS

PDF

78.0 KB Created: 2021-09-17 03:22:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ac5ce65bb0d4be0e49c57ded2bde3082 SHA-1: d4de205cc2f3b1185efd1ac53015c4c3796c6577 SHA-256: 4a622c386610170d34db1bdaa0ca505d9b85f32833fbda422dfa38c8aa5a81be
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to various disposable domains, some of which are identified as compromised WordPress upload storage. This suggests the document is designed to trick users into downloading further malicious content, likely a second-stage payload. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6077

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://tachikawa-derma.biz/ckfinder/userfiles/files/87336885029.pdf
    • http://big-blue-bus.com/pics/fotos/1/file/pofititakal.pdf
    • http://mikomisushiwc.com/uploads/files/82539958740.pdf
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/batakibibupasesepufi.pdf
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/volakaj.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143c8c26e854---pimudedanonebumorakefabu.pdf
    • https://dreamscapes.ca/dream_scapes/userfiles/files/69069080434.pdf
    • http://mya1fc.com/files/ckuploads/files/75021715803.pdf
    • http://abwlargo.com/uploads/files/19800022954.pdf
    • https://ipekyolumedya.com/resim_galeri/file/sopunej.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1613048d628621---27933097272.pdf
    • http://werkschoenenverkoop.nl/images/docman/files/86558470168.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a50a0b4dd---pagugopifuxemik.pdf
    • http://tonyprins.nl/images/uploads/file/49475431905.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e5301f312---51634421994.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16143d06267705---97330922526.pdf
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/gogofuw.pdf
    • http://twgo8.com/uploads/base/files/202109122309066267.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=fortnite+mobile+download+apk+obb
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ead5.bin
87ef65e6e9f82afaa1dafc3802775a71bc90e6ee270c0cee1c4bb319a323f6cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD5 18140 bytes
font_01_sfnt_off00011a2c.bin
61e2416b578929c6e3fb97fc6f7767dd32e1c7e97b3684bb63ef7714759575ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A2C 10680 bytes

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