Malicious PDF — malware analysis report

Static analysis result for SHA-256 630b57d58ae89277…

MALICIOUS

PDF

64.0 KB Created: 2021-05-09 23:38:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 197d43b689c1282181b5d7c0f8fca20f SHA-1: c49f09df25e2b6721c18a3c4be23add25ab39049 SHA-256: 630b57d58ae89277a9f8e9c7b4dd67240aeb543a794b93ccccb9fed0ee6b96e9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to multiple compromised CMS upload directories, suggesting an attempt to distribute malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9493

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://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/aa9d4uk78b08haid1ba82ll3r4/98449765926.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c09eb3e8af---gijiwutikozubopugov.pdf
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/bd27f00e87e7d668fc9557820bc3c20c/64126940041.pdf
    • http://ash-graphy.com/userfiles/file/rinejazeve.pdf
    • http://airholic.com/UpFiles/WebEditorFiles/file/81598483788.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6744496c2---58603563023.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/docsgmgj3lgsh4c5bjjpf4cbku/ganuw.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6891d6d88---61001930886.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078f99412333---sunabeboxulu.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/75eea22b07e3fd8055ee0bd20310521e/6203554201.pdf
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/50esmt40b21vva2p30r3fjtuqs/52537761402.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad7b42fb37---pogivoji.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c76212359f---62238557816.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a19a26a502---23228061293.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16076e083724a0---fagelofuduxazik.pdf
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9da75e3d8---44531916535.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=badland+apk+data+mod
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbbf.bin
6ab46f12474e68139f673941b37e9ef79510a81aedee0b72b2ed9b9adda6591a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBF 3288 bytes
font_01_sfnt_off0000e782.bin
7b49633122a33e63928fc2e0556f1bcc6e2ee042cfd142fa9a5f4481e395e94c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE782 4944 bytes

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