Malicious PDF — malware analysis report

Static analysis result for SHA-256 f60ac260fcb84e1b…

MALICIOUS

PDF

81.1 KB Created: 2021-09-08 09:23:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0697c3a57eb799be112d3b6ed38af07e SHA-1: 0d47922b8b5d1903bfe8eafef936d6578c2b420d SHA-256: f60ac260fcb84e1bf9fcaa27ff06367e2e50f1d952b74ae9875f597716eb792f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external files hosted on various domains, many of which appear to be compromised or disposable. The 'SE_INVOICE_LURE' heuristic indicates the document's content is designed to trick the user into downloading a file, likely a malicious payload. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://paillasse.hu/userfiles/file/14490605023.pdf In PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16125e9342f9ad---12982838060.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/sepijinobonufijufere.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/98585098100.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/7ab0bcfdd1c8bf04ac4e7ecdd99a1c02/suvadomu.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16078f38c50a2a---nudatajonibetoregipezoseb.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c96d3c37842---jifowururenanimiware.pdfIn PDF document text
    • https://curryleafharleysvillepa.com/hang/userfiles/files/gopelidokunutugore.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161046308cc966---timogejerip.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/fcabff74d75ccaee775ffbac0ce86869/vupelijileduperamovolefem.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/kaxewibajevud.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/petefugizegopusikopinigox.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/41805017579.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b15100e7868---wajesumitolamolepexumaj.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/57a505415b68ea133f761767009a3852/kuwilupevitaju.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/19c63ce191ed9260392dd9f394f915c4/sonofe.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160748d97a7400---7141731320.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/86325549647.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/17772598485.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/vajur.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/39030682574.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/silevevanejirewijodapusi.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/cfc0ce03de3a1dc58be279e39f005c6a/919422307.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/c08dd32cac1a51426f0d964e9850eac6/borowazip.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5a92681fd---87747212564.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=export+spreadsheet+pdf+to+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_off0000da75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA75 10608 bytes
SHA-256: e21abe4ea6745471c9f806243aca07d4382e9173c9afab278f93408d1c7bd24c
font_01_sfnt_off0000f2e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010af5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF5 16960 bytes
SHA-256: 1791b037945aaab189d8fd8b4618a8473de48afe1c23f54df5a92ec36d4303d9

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