Malicious PDF — malware analysis report

Static analysis result for SHA-256 b446bdcc1e435622…

MALICIOUS

PDF

91.6 KB Created: 2021-07-05 05:13:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4627513b694489d21209c7fd1ff87ed3 SHA-1: 5639e98512fdac6557783761e74a87db53240073 SHA-256: b446bdcc1e4356227af7028276b86af1b02d2a3bf92d89de5597f37a8c6361ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised CMS uploads, suggesting it's designed to redirect users to potentially harmful sites. The presence of numerous unknown URLs further supports this, likely serving as lures for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/2283b630345034258347553d55c86a77/95255316839.pdf
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/2095046199d76d4f58ba1912495c3364/16179373044.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/09agkas4shusu32j6n60j0fknc/16816068403.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/1513b746fedae7146632c78311c8dbff/892939372.pdf
    • http://arcomproltd.com/userfiles/file/60718708475.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/aaf92549d0f5532ba26ed6cc97c69303/86579821123.pdf
    • https://kurek-rowery.pl/user_pict/file/939321614.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16071c0b631a84---kazipifa.pdf
    • http://ylphs.com/ckfinder/userfiles/files/lunoxomud.pdf
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607703fb3a220---netebemarenuniwikil.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4cf31d91c---tofejelarodomugi.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1606f26dcb1b50---xifetagixaxidiginiluvuv.pdf
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/8e950911c1147aae0bb02b00ca6c594e/gigebisidepotad.pdf
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/68699876a6df605ba4a48f746b079f04/lituwefoxifanatiwo.pdf
    • http://ghioroiu.ro/sites/default/files/file/76581011843.pdf
    • https://aawyx.com/sites/default/imageuser/file/bijewowotezab.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/bcaeo2pm5pal12t2lq5r2cdug2/vavezopodilovumifiwuv.pdf
    • http://christmaslandint.com/userfiles/64844155171.pdf
    • http://bettaletroom.com/file_media/file_image/file/xejudikarifemibifet.pdf
    • http://meruzhankhachatryan.com/app/webroot/files/file/63608840605.pdf
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/61689a4d8665c0f7ad8932825e50d86b/lafagisesuzitubisaxop.pdf
    • https://przyklejki.pl/userfiles/34668927932.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5a612fdf7---38463475839.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c6491c39d---87997506525.pdf
    • http://starlightcelebre.org/clients/4/43/43e9139217482d7666ce300faf566241/File/20905476505.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=run+jar+file+on+android
    • 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_off0001027b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1027B 16792 bytes
font_01_sfnt_off00011a92.bin
5420325b5479bb35fa4f0913500555a1fe5f2ca54ba36f12eeb4f7376c85ba97
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A92 10356 bytes
font_02_sfnt_off000131f8.bin
b7d5074551886abe48edbcea4fe8698cb8645795b5c7bfaad6cd92c5a724b7eb
pdf-font-stream PDF embedded font (sfnt) at offset 0x131F8 17252 bytes