Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a07a989c9e56164…

MALICIOUS

PDF

84.9 KB Created: 2021-09-14 13:43:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5341c743a23c588a96ba5f3aa50736c8 SHA-1: 8fc88c69eacac4df681f8777e93252f74ab443aa SHA-256: 6a07a989c9e5616448e3d306e7519414d76703bf567bf2811b687f24316acb8a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://ke-sen.com/userfiles/file/1630909792.pdf In PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/40789664564.pdfIn PDF document text
    • https://free-spirit-city.eu/uploads/wysiwyg/files/zegokaramiganoluxoxakinit.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/oqut6hefhl05l6ps2c3pe9hgds/gupunatirol.pdfIn PDF document text
    • https://holycrosshealthcare.com/userfiles/files/76997822603.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/balebilinekenit.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/36417579805.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/vikevakutirus.pdfIn PDF document text
    • https://brihat-group.com/assets/userfiles/files/xumuwakurupakira.pdfIn PDF document text
    • https://t-groupvnxkld.com/uploads/news_file/86509214571.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f31d4acda6---91614643707.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/ebetuli00ee0uehnjotcvn68j5/37616558815.pdfIn PDF document text
    • http://bscartridge.com/pic/vadojomogefuze.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021090217484480554.pdfIn PDF document text
    • http://vibrobeton.by/pics/files/bexubemoturiwutegaf.pdfIn PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/dejiwituf.pdfIn PDF document text
    • http://kisito.com/userfiles/file/53439014000.pdfIn PDF document text
    • https://unaizahic.com/Files/files/22783436095.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f441251183---jopuvuduroverilidux.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/wesupabakuritunalake.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/71394647006.pdfIn PDF document text
    • http://skmsm.com/userData/board/file/nitobunixumenojixiwigono.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16136c742d5b5c---65018572156.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5d2dbae00---28149494304.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/lefedevukufawo.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/591bb5da813e7300a3fad134c5e5e75c/pojenuvunemivadixikijexe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=what+does+bushidoPDF 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_off0000e989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE989 10328 bytes
SHA-256: 16dc11485d69e6b3a27afd6bdea668bc88c4ac3ab0ce9f8f39251e7431760430
font_01_sfnt_off000100fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FA 17504 bytes
SHA-256: 800f010f8c6b1084d1b5c4ee967e5d608a112fff1cd4ab80717d844c067a0f10
font_02_sfnt_off00012df9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1