Malicious PDF — malware analysis report

Static analysis result for SHA-256 b948479ddd418fb1…

MALICIOUS

PDF

85.6 KB Created: 2021-07-02 03:55:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 66b11f0f6814e5bcca59c85f8c732ef9 SHA-1: 64a13972c329358cb8cbe35a49d004eb4d2ee274 SHA-256: b948479ddd418fb11ab4641ee3842b0199cd747457dc922366d115347d230e34
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of multiple heuristics related to PDF link farms pointing to compromised CMS uploads and disposable hosting, combined with a 'download button' lure, suggests a phishing or malware distribution scheme. The embedded URLs likely serve as entry points for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=medical+report+example+pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b9cf9330514---71313638460.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16081890725268---disegulo.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/2fd95872ceb5c0ec2a77525ecd8f012f/zerezakedusixanisonub.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860ea182969---97440936264.pdf
    • http://leebyenghun.com/new/upload/board/files/81285327476.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1a996264e---26570014860.pdf
    • http://artecgroupservices.com/imagenes/file/24158877699.pdf
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/9carte5f3k2h4ql6hb3fb2cqg4/suner.pdf
    • http://krukewittfarms.com/userfiles/file/68691259843.pdf
    • http://baominhlabors.com/upload/files/pumemorixijuxiwetijixapak.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9f66715bd---bukozoxa.pdf
    • http://alt-1c.ru/userfiles/file/pixedipirenejokifow.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ad95c2ed3---63688441847.pdf
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/dc1cd386a2fafcf1e6c83a0ea8327d8b/9509797734.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091768e3229e---vinekonematijatovage.pdf
    • https://ajwatravel.com/wheelmarine/userfiles/file/54158078985.pdf
    • http://anaminfo.com/attachfile/file/17888371018.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/t95u1rtkddnljp9f7421dlnm7h/mojulokebabuwumu.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2fdc9c2da---8471675124.pdf
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/60e63c040065551ad1c49cd2b4199e12/dibufomojitakit.pdf
    • https://5uempat.com/contents//files/palovuxifanegimiforaki.pdf
    • https://cortopolis.ar/userfiles/file/geluxararowolorubekisuz.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd6d31bafc---14125074001.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16091573cc3372---10816999357.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_off0000ec93.bin
4f8248aa9544096e866bf03de7210025605e3e87a15ed7e379079d4a9bf2d1c3
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC93 10604 bytes
font_01_sfnt_off000104c6.bin
ac4085351aad3e0ff24dd5bcb5b217217f25fa7a5fdfd9696f6163937dd3ac2e
pdf-font-stream PDF embedded font (sfnt) at offset 0x104C6 17080 bytes
font_02_sfnt_off0001313e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1313E 16792 bytes