Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b17d5bbc6bd00e7…

MALICIOUS

PDF

84.5 KB Created: 2021-09-07 23:36:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 876cd0db2fd546339123a78d92b5f946 SHA-1: 4d438a9c22804795640d4a8dcfa19ac2a0a197d6 SHA-256: 2b17d5bbc6bd00e72c8d2eca2e7dd470ea1d4c3bd8e414943b40a6962fea04cd
156 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern involves directing users to external malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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.
  • 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://democv.associasuite.com/imagenes/contenidos/files/43348823199.pdf
    • https://gujaratisamajparis.org/upload/files/4069122323.pdf
    • http://tofuyatogo.com/uploads/files/tabolajubasoko.pdf
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/477156b94e7e523c74e83a26844e1797/xoziwigerojar.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b72f6822d1---zejobefujuvowun.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16082be2b71603---tawumupigamujizeragu.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/e6f6ae1e3c51418f5165a883d52c3efa/70981270079.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/qsgrb500790rt9lkhb7vt4eggv/29818779474.pdf
    • http://bearings-home.com/userfiles/file/47624823443.pdf
    • http://nccutrackandfieldalumniandfriends.com/clients/2/2c/2cea5a7e730406ee40dfbbde6098010c/File/88284375600.pdf
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/tojagujukafemareludovi.pdf
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5c37ca9bb---dikizatinenep.pdf
    • https://castilloexterior.es/ckfinder/userfiles/files/zuvejonebigotaxetanunov.pdf
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/0e6d1f915703f6580061a6b57150d664/bukititidiwuwekobavimeg.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160befdf874e8c---temul.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/7cd6aa47634e72724e6a717cce48c590/52610094323.pdf
    • http://istanbulballoons.com/ckfinder/userfiles/files/39157385479.pdf
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160875f31f04ab---74408476725.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16107478b31ec9---51766913260.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/b28c15c1ca2d491a03428da0d4e5c2df/59380158281.pdf
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/pvr5ajtq8qe931as54dn8jsh1b/68585131662.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160919755d634d---ramixukirusikasafidaxinaf.pdf
    • https://alibabaoman.com/basefile/alibabaomancom/files/98891742287.pdf
    • https://franchise-vietnam.com/app/webroot/img/files/97195346992.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=ssc+gd+new+syllabus+pdf+download
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d290.bin
6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
pdf-font-stream PDF embedded font (sfnt) at offset 0xD290 1680 bytes
font_01_sfnt_off0000da8d.bin
f841b144ac9c180a8ee4e6f8b4963bbff4bbd0b87ac420173d23bef88107e90d
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8D 11020 bytes
font_02_sfnt_off0000f3f0.bin
0ff576bb4cac7f6d5b2b3d86aeb3a49b5e351fc50c175340e56fb3cd851e693e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F0 21392 bytes
font_03_sfnt_off00012c46.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C46 16792 bytes