Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7dc7453b8779b6f…

MALICIOUS

PDF

83.1 KB Created: 2021-09-04 21:37:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9a1d08758b4581c3547acef1a93851cd SHA-1: 8b98d7688080ffc6c436498d0b4241152546044c SHA-256: a7dc7453b8779b6f59bc45d136c54b0097be0948a8409cfcc89cb7c0dd62a4e2
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, preventing a more detailed analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://meble-tk.pl/userfiles/file/41401238761.pdf In PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16071901e7e049---47491222055.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/begokozudojevako.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/90843669848.pdfIn PDF document text
    • https://ebooksweb.net/files/file/wotizuv.pdfIn PDF document text
    • https://okinawa4d.com/contents/files/22294180118.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/aj2rnq828u9emrda1vir5ns2vq/kudukifizemidomeritov.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16084a654f2131---paruwokefepafi.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/sapez.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/molobenetagilakof.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf4dcf49ee7---48481096568.pdfIn PDF document text
    • https://samuelben-horin.com/userfiles/file/muzukikizevip.pdfIn PDF document text
    • http://palami.by/images/file/goxepogevorezolelikas.pdfIn PDF document text
    • https://editions-tlp.fr/ckfinder/userfiles/files/27198635301.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/ranigoke.pdfIn PDF document text
    • http://vtaky.sk/media/file/jejaxepom.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/rixemikuzamaritobar.pdfIn PDF document text
    • https://tessuno.com/upload/files/610491194c4d0.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/gimarabotubo.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/wirivizulotisavidomirewom.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/jebaduginabew.pdfIn PDF document text
    • https://geniodelweb.com/file/fagubalasix.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/wixurozujijerezaponok.pdfIn PDF document text
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/hjpjkelcs8vjgq5reqpahfgspl/28842129090.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/39243654619.pdfIn PDF document text
    • http://rambud.pl/uploaded/file/20170160850.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/26ac0f4ce16ae3c584be4cae5cc529a5/70939111334.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/60624299227.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=lock+part+of+a+worksheet+in+excelPDF 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_off0000e30e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB20 16528 bytes
SHA-256: 5bdb080e23e417cc6a36fc50abba0bdccb437f5330a41bac4ebacf4cd7d67a53
font_02_sfnt_off000125ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125AB 10812 bytes
SHA-256: 64094207cef31730a8cad2d426c7545d6baad37a9ba3e42aabf0ec163c4cb3d3

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