Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c0a7417db168ef4…

MALICIOUS

PDF

113.1 KB Created: 2021-07-04 10:21:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 55dbce4cbc9edd7b30dc84d79979970d SHA-1: 319a2e2065f5ced17b02660c378649e0482ae065 SHA-256: 7c0a7417db168ef4e5bc6c681aae7d5fa887778aa8284cc7b33bd58b2ff1fd00
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload storage and other disposable hosting. The primary purpose appears to be redirecting users to potentially malicious sites, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9805

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://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/v28ft9cth7uh23ehmotgurvbno/49383602734.pdf In PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/6b1a98ea0de134c4d7a1ae09aabb9bee/63074767361.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/5f35f0f90ce4daca4e8d7a5f4561b71a/zejezujororixelawib.pdfIn PDF document text
    • https://hirurgija.me//files/19751842961.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/a3a3bf17f9b0dd1c3d6ee8cba07e9a22/tawalagamolugowawumatijap.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/ammriccsdg8hmao4vqrh4hhlp4/wuripomafovagopenuzivilo.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/5319218279.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16073bd38190e2---11637462500.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073484800912---rowipanuso.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9494e09966---fefozamobemogewilepe.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1609b382bee696---77234250337.pdfIn PDF document text
    • http://sharon-barron.com/userfiles/files/fevupelusemuwubar.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b14b9692b57---jigafifebutosunomegin.pdfIn PDF document text
    • http://debschoen.com/userfiles/file/xanikikot.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/2b015fd812d9872f78ed90fe0ef53f48/sazonibipubulogibe.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/fd9955c59ea5ca0fbf78403161190900/pipep.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/14080183522.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/06ncqn84eut6tjqsoevge4en72/3213458484.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/53180290368.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/13416355604.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/55894659981.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/17227848478.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/71198260029.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767094a3d09---19938110702.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/10135854200.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d22fcfe971f---kofukavekasefupurozazajo.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3792b278b---fisameduwa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=physicochemical+properties+of+dnaPDF 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_off00015201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15201 19228 bytes
SHA-256: 12afb96367061626acc4c04f2ca20827d282babbe395bd5abf36233e07ce7b0d
font_01_sfnt_off00018555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18555 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019d6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D6C 11000 bytes
SHA-256: 7ffed42ef0255df4a5df2eaa58f7e88d82db5df32847a7d817f5651b1eb73db1

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