Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac82a7b7e33e1ea7…

MALICIOUS

PDF

75.2 KB Created: 2021-06-28 02:59:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b02653bb8d0b3cbbfe00f1cea75a0c63 SHA-1: 8ce4be96871be8ca79f5971790538a9249f65f07 SHA-256: ac82a7b7e33e1ea7f7b342cb6338f91bf7dca8a37b7a803a2e03281a02314248
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains numerous links pointing to websites that appear to be compromised WordPress installations, identified by the 'super-forms' or 'formcraft' plugin paths. These links are structured as a link farm, suggesting an attempt to lure users to malicious content or phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/q06dvfitgg1j02jaih6l5qvjku/80004334606.pdf
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/asl22kfqdhuaffdv19qv1h3tpm/59170307631.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1607e10aede94c---13286493738.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/7137c9121ae0959c2c86c4219ea82da8/88830357298.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/jge732bvep69jb9gp8d53ksfs0/54071303870.pdf
    • http://flexa.cz/docs/file/98804147746.pdf
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/ba71c9054535e15adcb0bc4d58240d63/66651837962.pdf
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/488d978c909bfc08c0d42851a220f1c1/92492372726.pdf
    • http://vervesimuhub.com/userfiles/file/38086346508.pdf
    • http://khodahoanglang.com/admin/webroot/upload/image/files/3719872191.pdf
    • https://floridainvestment.cz/files/file/64805620281.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c91f6319f0---17798188541.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160cc47859eb15---fawesumebolimegemid.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c63ae4f8a2---2766548833.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/250202340b24c6434c48ebbe13abf90d/36882929442.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/sv3lm0k09ha8m1dtm7f9qggsqm/14758380600.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080890cb6066---16689777401.pdf
    • https://hostingalani.com/calisma2/files/uploads/80371625121.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160700dd0136be---39626130887.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088a964a1392---xudamef.pdf
    • https://vibangthuaphatlai.net/uploads/files/53156150064.pdf
    • http://best-infosystems.com/userfiles/file/vetefogasivadaji.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=all+elements+in+this+group+have+1+valence+electron
    • 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_off0000c428.bin
82f91a4a317dfe5c4c10d7b421c2aea8e8537d0c8e2d5558f2a3c7c0caab6f6e
pdf-font-stream PDF embedded font (sfnt) at offset 0xC428 11020 bytes
font_01_sfnt_off0000ddb1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB1 16792 bytes
font_02_sfnt_off0000f5c3.bin
be9843bca7a8384522318a3ecdabc7a7533784e656c1eb3dea87a31755ee5935
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C3 16028 bytes