Malicious PDF — malware analysis report

Static analysis result for SHA-256 56c301d9accd582a…

MALICIOUS

PDF

85.8 KB Created: 2021-07-29 13:37:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 1879bfbf5fb5beba9ebf4e7a23907710 SHA-1: fefb502ebb5c424806aaa8d2ec01084b9a4a5573 SHA-256: 56c301d9accd582a065d48623effb961482edf69d1267547f2bc9ba624d1595e
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites utilizing the Formcraft plugin for file uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these link farms. The document body is unreadable, but the heuristic firings and URL analysis confirm a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e66bc07a1a---divopimexodomexoxoke.pdf In PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16080c2e58e770---lejoparenurif.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/up2os689pf5nd1ps4o69vfk4c3/4136612596.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084bbf48bed8---pikujap.pdfIn PDF document text
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/vomejajawonezixurin.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160748ca6dde61---fegawu.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/84599298525.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/ddc944128b563214b21631c2d61c9b8e/5457863255.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/gd00tslp1e8149q889di4g8vgs/7540034988.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077544f261fa---vonevokamefozemubofusi.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/60068053747.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/6oqj9te0c5kk36j5pnjmh58k9n/kusinironoferefujer.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/vuxiforuwewuser.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/babalepegoxiwuratawaveg.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/daboguwadabazezasupoxeko.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/fosujubonozute.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/987e5e7ce1be189e60da5c5d7cb469ac/keliwilimad.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/d61786af01f048fdd3b270a7d77786ab/25288562945.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/4e042bc0ee9c70a7ca9bd218c5b616a4/3622768562.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f568318ef1f---falabivusotexajipajabumo.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608e54f91dcec---58694708587.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/0e0414147dadadadfe422a0da6523be4/3594086151.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/7b4h0ddam5kt3b76al435geo9e/mabupimajutuviguvu.pdfIn PDF document text
    • http://salinahighschool1968.com/clients/3/33/33fcb9b832a528c934b1ac42c6b88a99/File/3636477508.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/628f3ts2qo0175cbv8nrfrpab2/wopagedewoxikijetemi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=cuanto+es+5+pies+10+pulgadas+en+metrosPDF 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_off0000e6a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A0 17816 bytes
SHA-256: 23c3ea778f866f80bbc86a7c8b2577159babab054e95f3b0a92b444b1c0625b4
font_01_sfnt_off00011435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11435 11176 bytes
SHA-256: c94400e9c6fe39106dce9c564056e6ae7a7a630cd13040786d02b369422776c7
font_02_sfnt_off00012e38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1