Malicious PDF — malware analysis report

Static analysis result for SHA-256 a505af9369db15dc…

MALICIOUS

PDF

278.0 KB Created: 2021-06-26 04:37:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c95bd855c447c4be55086cedb8be41c1 SHA-1: 339504ee0ebf7a13765c93cf390fe56c1aba07bf SHA-256: a505af9369db15dc562b459efd6ebda559f247c45455eb287d995f73397daad4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also contains numerous external URLs, many pointing to compromised WordPress sites, suggesting it is used to lure victims to malicious content or download further payloads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9799

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://wastran.ru/uplcv?utm_term=drunk+mother+nude
    • https://lawina-radom.pl/files/file/divaxawopevukekufugu.pdf
    • http://ccforum.kr/uploads/file/1624070857.pdf
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/7qas7vumei7jhtdeqgkfhv7ue0/42121683744.pdf
    • https://cochleartudaskozpont.hu/files/kufipa.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/a290d645a0918115b7346552593c0c38/61667101898.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aae362238bf---9569081414.pdf
    • https://kimtuong.vn/isc/public/files/fckupload/file/gedosovavegabud.pdf
    • http://nenkin-t.com/upload_img/ck/files/likirolunuvaledazuxukiv.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2b16533e78---gatubixinerelo.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c65493c2431---99406160416.pdf
    • http://riskhedgetech.com/uploaded/file/1927643535609f4716538ed.pdf
    • http://anthonyvienna.com/sites/default/files/file/41408698580.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077fb1abd476---zofowiwotivanerimobodi.pdf
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/2e4bb3527f5f68f92fb8ac5c42c82ea6/3291768511.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3f5f9a09e---wezisudonima.pdf
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607a29f8afb79---88986929734.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/tthi7c6b0cl50tij00hjij7de0/jeruligamuvimijipupedudis.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607946aad5c1b---pijap.pdf
    • http://abc-tel.ru/data/File/kadoges.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608fee25dad04---9796796245.pdf
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/4578029833.pdf
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/gk306trlmjjp6caho4j6golrqq/fukubokumaga.pdf
    • http://atek-ent.com/upload/file/19136448999.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b03f3b7d89a---58524857285.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_off0003ee0d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x3EE0D 16792 bytes
font_01_sfnt_off00040624.bin
110b12e1b858372d0762bd3662f16917465798609cfcbf2972e7077decf04b7e
pdf-font-stream PDF embedded font (sfnt) at offset 0x40624 10236 bytes
font_02_sfnt_off00041ce8.bin
56f7ecb47c9d718f89080ee85700510eaedfb4d50526dff0a909ac86cb51c9a7
pdf-font-stream PDF embedded font (sfnt) at offset 0x41CE8 17356 bytes