Malicious PDF — malware analysis report

Static analysis result for SHA-256 c455473203114eb2…

MALICIOUS

PDF

82.9 KB Created: 2021-09-16 19:04:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 99683d4a7d6dbcab17a8f45ba9d995fb SHA-1: 17b7ab0783ffcbcf07f6ab9cec69397751c7e865 SHA-256: c455473203114eb22906abc078ab1cb7070da11acccf608fce9b284c8c3d2a8c
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable hosting and compromised CMS upload directories. These links likely serve as a link farm to redirect users to malicious content or download further stages. The ML classifier and ClamAV detection strongly indicate malicious intent, consistent with phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://csc025.com/userfiles/file/20210913182231_21paxh.pdf In PDF document text
    • http://gtlitalia.com/userfiles/files/nobunerafusuresoxop.pdfIn PDF document text
    • http://dekobonner.de/userfiles/file/nufekaluxi.pdfIn PDF document text
    • http://veewood.com/file_media/file_image/file/ravamipipuzomavom.pdfIn PDF document text
    • http://tao-ssct.org/data/upload/file/runoravedokabojigixug.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/29295189610.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/e87645e3e35a592e1a26025be954f879/zelevedikafem.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/wigolejelilizelukad.pdfIn PDF document text
    • http://didula.ru/img/file/vasamexe.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1612f601593821---38379737308.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/63189321899.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/rujevuda.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/fubitixuxi.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b963c95a3---tunukosobebamawizuvexu.pdfIn PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/97544915887.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/namagenetetek.pdfIn PDF document text
    • https://coluer.ir/documents/file/72441065257.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/sevixixer.pdfIn PDF document text
    • https://patidarpalanpur.com/web/k/main_admin/ckfinder/userfiles/files/77599180158.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/mosinurigonakasudomugu.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/9dc40953cc5d4a7b644bf200694dac39/pizoripurolilowuriv.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/33525369845.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/86294009721.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/161331a5e440d1---58750581771.pdfIn PDF document text
    • http://abpjseah.news-read.com/upload/files/62177743924.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/f531p780mcppm9m66bourr7m29/40559955553.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/19227749279.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=death+guard+codex+8th+edition+pdf+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FE 11228 bytes
SHA-256: 10ee97edb19638eeca0f62f6c6232145abfc0d073ee3a23b07e09f524cba0a66
font_02_sfnt_off00010f1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1D 18172 bytes
SHA-256: 003c22ddde6000ed3f7d6e5dc786db670e297029bb85d44ab4b1944f06e28714