Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b06d4b78e7d952c…

MALICIOUS

PDF

79.9 KB Created: 2021-09-15 23:17:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 14ca15a57dff0af74fd59f4dd263fade SHA-1: 589d981d3e6573b2b4fbb186a3d15b65d66417ef SHA-256: 6b06d4b78e7d952c2dae8548631796957e1d505c578c489f2f50df2d01176caf
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites or disposable hosting, characteristic of a link farm used to obscure malicious destinations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://uitvaartverzorgingsindex.nl/images/uploads/mesodigebigibonuzelajaku.pdf In PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/zapegizebamajetosebawuj.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210912191148_jw8hxp.pdfIn PDF document text
    • http://jr.ac.th/ckfinder/userfiles/files/13247675407.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/telonagapozujo.pdfIn PDF document text
    • http://hmconcretemixingplant.ru/d/files/27314910022.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/rebararusutowiwidabufabo.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/nafoloweguvi.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/62603342831.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/jikigisewelal.pdfIn PDF document text
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/lugukelupi.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/3b71a0cc5c22f37f939e048f89d0c51a/97565152029.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134451fdb09c---24510593506.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/jowopagalerelulimiwoxon.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/guxademurozatovitofalemok.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137a68e3d8dd---vilopuxerad.pdfIn PDF document text
    • http://baozhaopharma.com/upload/files/87585414395.pdfIn PDF document text
    • http://art-lan.ru/uploads/assets/file/94296495712.pdfIn PDF document text
    • http://gzcaifeilai.com/ckfinder/userfiles/files/202109022034348271.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/212c3934ced7bb7faca687a57dcf3eb4/65622493100.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/xafajagesulano.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc74e74fda---51648562516.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/84894112730.pdfIn PDF document text
    • http://hzosm.com/images/upload/File/93660146266.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=grand+gangster+mod+apkPDF 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_off0000d610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD610 16836 bytes
SHA-256: 5ae6c41cf9e10ab1e6b3d1a41ef1711e12dffd8a462f7d0d33333cb46b54204f
font_01_sfnt_off00010196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10196 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119AD 10728 bytes
SHA-256: 23da4ffe4a0ac9afe23824b916eb892031b686fd210d3949fc0b4122c3da9571