Malicious PDF — malware analysis report

Static analysis result for SHA-256 a460ffcadea5f37c…

MALICIOUS

PDF

80.6 KB Created: 2021-08-28 15:42:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f9c8c68dabc1bcca6411d241b17b4f85 SHA-1: 1b19bc8cb812842f1db82a7a1dea46c793709dcd SHA-256: a460ffcadea5f37c10b7eae0c4f0f16a99145bb1adb71ba324d53a715bc295ad
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to websites hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the primary attack vector appears to be the embedded malicious links.

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 http://orvosvalaszto.hu/uploads/files/jalimoduwidikukakoto.pdf In PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/29615899597.pdfIn PDF document text
    • http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/1085814242.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/wawevides.pdfIn PDF document text
    • https://htchninc.com/d/files/sapinudevitufetikapuvakuf.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611cbcb740dcf---xolologijowamozixeki.pdfIn PDF document text
    • http://bendhorseride.com/userfiles/file/1860381176.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/45849013084.pdfIn PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/vql7bee0j2m0p30h7rn70i4cg6/33268822382.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/22214045884.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/tepubetotekodaderitole.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608c15902ea36---mavige.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/i4mo8li7lim2lf011aa0f4i0e2/19539780363.pdfIn PDF document text
    • https://basundharamart.com/userfiles/file/26871062763.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/wagubegojat.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/qip2po3ofqras29us3n9ed42ks/35026227700.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/pvqke4csigljsbff0or9g50966/xenofapunisoroxixef.pdfIn PDF document text
    • http://spiregene.com/image/files/20210816_153037.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ad34693726---pojeki.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607082acdaba4---61501984648.pdfIn PDF document text
    • http://hennel.hu/sources/elemek/file/15111182637.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/ja7ksnlqiephs47g9v3fjg7qj5/kopoj.pdfIn PDF document text
    • http://cdkkck.com/uploadfile/file/20210814033213.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16116ec0bcf7a2---ginozopuwamepadaxi.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c62c3ebf47d---11623204524.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/walademoma.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=anova+and+chi+square+testPDF 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_off0000d519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD519 10712 bytes
SHA-256: 49e4434c1fd34231a2192281abb27a091767142972c3e5ecd0aaf0c378c1c582
font_01_sfnt_off0000ed88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001059a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059A 17788 bytes
SHA-256: afead21c06f900089f4248e8d192acaafc0db57cf1b58e5444efaa7ee0ee96fd

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