Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6004d1b2dbca342…

MALICIOUS

PDF

134.7 KB Created: 2021-07-07 05:49:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5733a233ac2af770a64a5610af1ab53b SHA-1: 5ceaf7ccdeb85276dc5757be6c3f5b9eab43ec19 SHA-256: c6004d1b2dbca34221e18b8e3e4c5180a53b99aabbc6baf6253ce28759b6ad12
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9408

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
  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f4ce9e84c---65238115406.pdf In PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/torulebi.pdfIn PDF document text
    • https://actor-conseil.com/files/file/55162857553.pdfIn PDF document text
    • http://texasstatealphaxialumnae.com/clients/f/fe/fe72632f573fdc77cca6b85875c63e8a/File/84133471775.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/punebomipegud.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/garoparaw.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/oedjd20fnq3sghtocl8phh9mjg/73485604134.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/5b1b63ceec31d4464d54347b3ef2877e/73732202636.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16089e01bc8f7e---64081765968.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2e96bdf33.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/92192374784.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5797a81f03---26109844892.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/99101411991.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/d344eb32d017dad7059a382c86c54f1c/87289390377.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/naperodekujogagut.pdfIn PDF document text
    • https://soechi.net/userfiles/file/76057312487.pdfIn PDF document text
    • http://keramann.ru/uploads/files/78053343564.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a21c23e0d---nasugemobewudazexavudon.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160875e144124e---jaguvapu.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/sorejorarixowemot.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/80904685246.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/73361726340.pdfIn PDF document text
    • http://goref.ru/files/file/zusoxazatigenegopo.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/1lgupk6ffgpr7gnqorvn2fqqo7/71725157942.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=the+gifted+thailand+streaming+sub+indoPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000166d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166D4 16588 bytes
SHA-256: ebbf6a75d716c8d492e4cf34b473fd04eb43f3d26bb5fd256238e5834ab9748f
font_01_sfnt_off00017d69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D69 18860 bytes
SHA-256: 56bccbee946dddd48ed81c2e9a87202b7bc0f06bd6650591d28d28a29f0a2265
font_02_sfnt_off0001aeca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AECA 11004 bytes
SHA-256: 389ce8d81123805c69bdd86e0d14285996bfb8c44b8f53d13fc963df77bff031
font_03_sfnt_off0001c7f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C7F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off0001dffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DFFE 13924 bytes
SHA-256: 0497ac0647df31495cac45ec442b6a907913beaaadb99ed5b22871978b0897f0

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