Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3bb246cb53ba32b…

MALICIOUS

PDF

86.0 KB Created: 2021-06-29 05:29:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d83eeec3b606cdbcecf4f4a81c9d7a63 SHA-1: f44fb0d24b9c3b937d808f74cd93ce4f878a87d3 SHA-256: e3bb246cb53ba32b53f26b5b9175c46ec68df75dea67bb9943497b3f1676341f
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae78a6c63f8---nojebakawuz.pdf
    • http://bukharaatlanta.com/sites/default/files/file/4534352013.pdf
    • http://bio86.fr/fichiers/seluruxenij.pdf
    • http://monkey-do.net/userfiles/file/90406525647.pdf
    • https://abugfreemind.com/userfiles/file/70003661126.pdf
    • https://jdlpartnerss.com/userfiles/file/7784982805.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608aafd9497ba---tawalumux.pdf
    • http://oryginalnedekoracje.pl/userfiles/file/20719936850.pdf
    • http://comp-art.ru/userfiles/file/13080982624.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/3180bbc1a7fbe002f388212083957cee/50497193806.pdf
    • http://grandinspirations.com/clients/75274/File/17226412719.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607146dfba45e---85922293808.pdf
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608663311e65e---84017629048.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/64c7b1e11c253a07ed3be9c8dc3601fa/11684706276.pdf
    • https://zemiigori.com/uploads/file/mezubatujosulekejalufamo.pdf
    • http://fittbike.hu/files/file/gujuwir.pdf
    • https://ludifrance.fr/userfiles/file/jirafejuziba.pdf
    • http://arci-mp.fr/admin/File/1975004953.pdf
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/vazefikixawijixazolaful.pdf
    • https://la-klamm.org/userfiles/file/sivekokaxususogokevowoso.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c43dcbd8c81---negolulugowax.pdf
    • http://chiengthai.com/file_media/file_image/file/45779479679.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/d057f36267554aa35f0e1dcdd3a38578/3981639836.pdf
    • https://vieclamxaydung24h.com/upload/files/wotozokafekigareseteteko.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160902a267ab26---tewekibawejenagus.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=ed+castle+on+the+hill
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed21.bin
66fe02451f406af498441bef45cf47490dbd988a8c2538436225ed4a7b71c9e9
pdf-font-stream PDF embedded font (sfnt) at offset 0xED21 17988 bytes
font_01_sfnt_off00011b61.bin
bd183ee25b6ca3661bbb8a1e6894c1df092379c7e80eb150bd45a6c913467d4a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B61 10352 bytes
font_02_sfnt_off000132a4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x132A4 16792 bytes