Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a0506803f19edc0…

MALICIOUS

PDF

74.2 KB Created: 2021-09-05 07:09:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a75f4c564b8a0f24350e2d4c6791146d SHA-1: c0ce388d5ae41d4b905290f16be31e3f473c2c07 SHA-256: 3a0506803f19edc0bd795d872e9198b65ae5ffdb6193333113d0a8dd8cc18ea2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://pixomot.ru/uplcv?utm_term=introduction+to+fire+dynamics+drysdale+pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a43a6b8d0ec---10240415618.pdf
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/5te6ovdc197674sih381rrb3qp/58246127450.pdf
    • http://com123.vn/uploads/file/94140167511.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4bcab2a821---ziwugofu.pdf
    • http://www.biosafety.biz/ckfinder/userfiles/files/68537410956.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c09b0fb5d33---miziruwilukigo.pdf
    • https://armagedonspedycja.pl/files/file/47641358770.pdf
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/81495541433.pdf
    • https://dailyhondaotomientay.com/upload/files/16284501894.pdf
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/63196079619.pdf
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/8b8ljsg83kr7rgm5269ndfgkem/5897415487.pdf
    • http://www.asiacoservice.com/file/files/xefape.pdf
    • https://sanvexe.vn/webroot/img/files/83051094566.pdf
    • http://www.thaiboat.net/image/upload/File/lovinaxeni.pdf
    • http://architettosbaffo.com/userfiles/files/bujuseweba.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832f5a662df---84382909886.pdf
    • https://cissud.com/uploads/ck_editor/files/23788677751.pdf
    • http://nedirajtebosnu.net/userfiles/file/66161358813.pdf
    • https://pet-fashion.ro/mm/file/rafowatefobuk.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c58e68bdb24---99572869567.pdf
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/1f2df771a35f41d54939282abb362824/89832462181.pdf
    • http://surveycook.com/upload/tmp/202108/file/tisanojor.pdf
    • http://be1971.com/clients/a/a1/a19be2fc4cf8b198b52f296748481ce5/File/safimok.pdf
    • https://tssch.in/tssch/application/admin/uploads/file/5276955043.pdf
    • 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_off0000beec.bin
90f8d9466ec6c64b032ce533a8473624132b75412bf583d8837bfffd689e97e2
pdf-font-stream PDF embedded font (sfnt) at offset 0xBEEC 16672 bytes
font_01_sfnt_off0000e9c0.bin
1b566b83390c341042854561b32d4b3687575c28334507a5cab1dbfbf5d2ff43
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C0 10944 bytes
font_02_sfnt_off00010328.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10328 16792 bytes