Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab8ad0fd207cd340…

MALICIOUS

PDF

82.6 KB Created: 2021-09-08 14:57:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 02c20988d8b31935319a09767d3a247a SHA-1: 91424ea3fc8073a3b5456ac901ac4516d5840fb5 SHA-256: ab8ad0fd207cd340370020e7e2c0c713c5b011b680d3e375ef03edc771b64fbb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The embedded URLs likely serve as lures for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://coretry.ru/uplcv?utm_term=chuy%E1%BB%83n+pdf+%E1%BA%A3nh+sang+word+mi%E1%BB%85n+ph%C3%AD PDF link annotation
    • https://izyskately.ru/foto/ck/files/fijawunogidagavijit.pdfIn PDF document text
    • http://linza-market.ru/upload/files/jufefijekupuxelemel.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/28878761538.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-6/20210906185304932786.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/91639897498.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612eca11baf88---lusopikizoganetujodu.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sizifu.pdfIn PDF document text
    • http://highdesertrent.com/newsite/images/uploads/file/ruzekomibezetogonabugo.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/4028653743.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/39653771402.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16137cb2b138d5---98114243424.pdfIn PDF document text
    • http://eko-baby.ru/userfiles/file/21356108717.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/55206536627.pdfIn PDF document text
    • http://rezidencianestor.sk/app/webroot/files/ckeditor/files/figukawomonif.pdfIn PDF document text
    • http://izhar-energy.com/userfiles/file/mukigemejowejotej.pdfIn PDF document text
    • http://coaching-scolaire.net/userfiles/file/xazunavovexuwizumuledu.pdfIn PDF document text
    • http://coomargroup.com/ckfinder/userfiles/files/38011651069.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/48131fa1223fd02c88f7642fba405a11/18293245720.pdfIn PDF document text
    • http://mebizstekla.ru/userfiles/file/lupepa.pdfIn PDF document text
    • http://distant-property.ru/fck_editor_files/files/tozovusavuvipifewirutib.pdfIn PDF document text
    • https://darshanam.com/ckfinder/userfiles/files/zunewevarafot.pdfIn PDF document text
    • https://goldgreiner.de/userfiles/file/konolatokubuzeligomavopir.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161300d4e76682---69525968413.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1612edb726bd55---nuvapaxotufon.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB05 11804 bytes
SHA-256: 53816a1ab4d3debd3e5a5356e710889c1cca8c6635bd11b1cedda10abf5b3d84
font_01_sfnt_off0000d60e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD60E 21216 bytes
SHA-256: dfbe002493ae2d295554e10bf7c694bffe5320eb9e32c8a8679cd45b7578d320
font_02_sfnt_off00010c9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000124ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124AE 16232 bytes
SHA-256: af293b2b60dc5e826b00d8953dd18f37a59bdd939ad7d7593537948814e7f124

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