Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c8d4b75e93f9299…

MALICIOUS

PDF

81.7 KB Created: 2021-08-29 10:44:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 84743f8c05f62a7b735f55919b4e6a22 SHA-1: 647174cf13fef811a27fec27514ab3be57871012 SHA-256: 5c8d4b75e93f9299909cb8febac5c04f98fb63f20d99781f337574750bafba4d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a phishing or malicious redirection scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to external sites. No scripts were extracted, but the structure and URL patterns are consistent with a link farm used for phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/inkj7lunvlf19kob31hv03r3m5/dizebifuvolizojif.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160abacfba7aab---fuvedixukubitefimenijud.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf59e46e42---kaxerarirerux.pdf
    • http://com123.vn/uploads/file/razurufexazepedemasope.pdf
    • http://bjbtrh.com/files/pic/file/vupixigirugojuboxugidon.pdf
    • https://newtech-utm.pl/userfiles/file/pobulenujoro.pdf
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1609db1ad46506---kujinoxowewenubivowon.pdf
    • http://sakurahoaanhdao.com/webroot/img/files/23292225589.pdf
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3bc55572f---27642759081.pdf
    • https://angkoronetour.com/userfiles/file/66115655240.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/730d845247c04f48daecbceaae3d3a93/mozikalad.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/345bbf51ca6673a2bc0cbfed4bae07d5/35618698415.pdf
    • http://www.como-grup.ro/fisiere/file/50608237826.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/bema698u4d53kd3hf24rmj3rsv/7922823196.pdf
    • https://aronabritcan.com/userfiles/file/11861923336.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4d14ef780---13939969259.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160804e1fc1cf2---weruvifumatat.pdf
    • https://aradovan.com/userfiles/file/35548525133.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160881899e448d---48317371136.pdf
    • http://atthaya.com/file_media/file_image/file/nugag.pdf
    • http://aucoindeshalles.com/menu/file/83014725707.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c13d03c5541---47127009636.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160867bc6596d4---taxuwedusipejibuwokeju.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=best+stock+charting+website
    • 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_off0000d7ec.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EC 16792 bytes
font_01_sfnt_off0000effe.bin
e66bf7a0a1a7a95c450ecba474674e2b4e1a3c622298866314b2689a06be81d7
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFE 18084 bytes
font_02_sfnt_off00011ec5.bin
bf03681636e5607491a12066100ccffcbcd4f343ec6fe91b384a6b516373b831
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC5 10832 bytes