Malicious PDF — malware analysis report

Static analysis result for SHA-256 99505e928e061c78…

MALICIOUS

PDF

86.1 KB Created: 2021-08-30 22:55:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3bca2d6d7b9607c3d36760279ac8d3ac SHA-1: be825e519468f7ee004f67b06c0e9d02e71ce784 SHA-256: 99505e928e061c78ea6fec967e4d4e4e97153bf66a8060e66e641fdfee1a95e0
164 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites and disposable hosting, suggesting an attempt to distribute malicious content. The presence of a 'download button' heuristic further supports a lure-based attack. ClamAV detection and ML classification indicate a high likelihood of malicious intent, likely to deliver a phishing or trojan payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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://penzionradvanice.cz/res/file/naxikazipin.pdf
    • https://fnb-concepts.com/images/uploads/files/77785323999.pdf
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/mhpu41pt468e1piheptbtfd1u5/bovisezixovumulunatodune.pdf
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/93506842660.pdf
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/9v9qgafjf12j7jvsmmh47pq8jb/runerusowo.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/9d05d6037de347ddc774cf7e731533f1/wagumuxinifobuwu.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/e181a63a7f699845def31af8516766ac/jezurizadupemakej.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b503b3b36---94009659396.pdf
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/284ee93c6607da5b5e378895bb893160/zumivosowuviw.pdf
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091ba2e25e88---wodagokozupuwokomex.pdf
    • http://pc580.cn/upload_fck/file/2021-7-31/20210731073912470731.pdf
    • https://abbma.in/admin/uploads/file/sutugoz.pdf
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5bf1007ad---24380319747.pdf
    • https://an-professional.ru/img/files/file/vepagavodugebu.pdf
    • https://kenhquangcao.vn/uploads/files/75038522341.pdf
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/6f3421e95038fc22018c3a41b2707f12/26700140666.pdf
    • http://aucoindeshalles.fr/menu/file/84455123641.pdf
    • https://nffcd.org/userfiles/files/52574376760.pdf
    • http://g-shocktou.com/user_file/file/gaxiwososa.pdf
    • http://wimborst-ceramics.nl/public/view/upload/fckeditor_images/file/jumidoxemujosa.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607dcff8aa5b4---fidegevuvujikarage.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160834b9b2a56b---zasizane.pdf
    • http://bestapp4u.com/admin/uploadedfiles/file/gexexile.pdf
    • http://stringquartet.biz/web/images/fck/file/jobexafafevepi.pdf
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/ct78sosvujovt40nrkbh01cf4i/79770360652.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=download+train+to+busan+2+movie
    • 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_off0000ec46.bin
d593144baf3ad5b87e66ab5d29c3ae0defb9974266e9b2544cb2f0bdb7cb3147
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC46 17292 bytes
font_01_sfnt_off0001195a.bin
261b775cd27bb34ddd7923fb5b89bdfe585067394600abfb8c1ed4ef0177487d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1195A 10920 bytes
font_02_sfnt_off000132bc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x132BC 16792 bytes