Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e6bc15160beb87c…

MALICIOUS

PDF

92.5 KB Created: 2021-06-30 09:46:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d378fb1d8ee06b4ea4f58d6159607131 SHA-1: 07f283149be3a95f3e169c6785f1f7edb10974c3 SHA-256: 4e6bc15160beb87c02343754a8f7c6d778367cd1c7b1c2f145a74340c789f081
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many of which point to compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to download further malicious content or engage in phishing. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa7f82f297---vasozadeg.pdf In PDF document text
    • http://zartmobilia.com/userfiles/file/20210624101426.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b33e1c9a5---riposoritotakizuz.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d0c29bc8f---lutolutikifo.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/2np7sijtotvvm9j45b4rm85mrd/kilovisad.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1d86bcb3a---lakuwopililexawelanimodu.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/purowituxojuvabanurofa.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160bafccd30e3e---vodapidadenejezojipis.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/d4u3i7h4h3t3b4add81fm5vjqk/39793990055.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607e09d7253b1---xagaxamitowope.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed0e5c9a51---82817923497.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607043c2d888f---nodeselaxetozewu.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092b67c1350d---27756545574.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021042922493473499.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/lemeturudavavopifaxas.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee00df0b91---dopinuvekepataxuferil.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/waseselaxi.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/v4vei8dkaj06erpbap0g1bdk30/26580849022.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/tixegu.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/c9fded09036f9b62ff4f5034ddf38862/zamizoriw.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fff03748af---89443691710.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160a10b0a83430---jalateso.pdfIn PDF document text
    • http://gagutp.com/sa_upload/userfiles/file/20210610200913.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160afc58130f4e---8559343475.pdfIn PDF document text
    • http://netisiletisim.com/guvennet/resimlerfiles/80241383691.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=types+of+disease+transmission+worksheet+answersPDF 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_off00010517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10517 10972 bytes
SHA-256: 7285911021d948f2d797e1fc89e92477502ba61a2682c7d840169ac380a67b8c
font_01_sfnt_off00011e74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E74 16932 bytes
SHA-256: 0e4f920b699ee13da3b7183c9aa86ec12742f9b41f9738f56464f6ad1f9587db
font_02_sfnt_off00014a7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1