Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6c14fdbc8d034ff…

MALICIOUS

PDF

72.7 KB Created: 2021-09-26 08:05:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ed8524670555d9fb8169727bf7ad8f05 SHA-1: 67b52defd52dcb33f3fde61de601077791dfbfe4 SHA-256: c6c14fdbc8d034ff089dd8c55f264d0a1df0bc3ef3a800698357bb79ad353878
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised WordPress sites. The primary purpose appears to be directing users to external sites, potentially for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://infrive.ru/uplcv?utm_term=how+to+set+a+default+browser+in+android PDF link annotation
    • http://artdental.hu/editor_up/92403223492.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8d8b6758d---vetetawizete.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/vagukevufojabowif.pdfIn PDF document text
    • https://lideregitimpaketleri.com/calisma2/files/uploads/71265439526.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/fbf99296c7acfa01596543f8fb3297f3/fefawoxegabegutiked.pdfIn PDF document text
    • http://m2m2design.com/userfiles/26496158713.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/turuseg.pdfIn PDF document text
    • http://turksebruiloften.nl/userfiles/file/69928044580.pdfIn PDF document text
    • http://protezas.lt/i/File/purazuruj.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/161383a2208956---43052032402.pdfIn PDF document text
    • http://iccjsc.vn/images/uploads/files/20536980302.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/97496874241.pdfIn PDF document text
    • http://embeddedhr.com/ckfinder/userfiles/files/19288598588.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/22424855662.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/45396580346.pdfIn PDF document text
    • http://kondicionery-dzerzhinskij.ru/upload_picture/file/58050456912.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161421b009bb1b---89233340557.pdfIn PDF document text
    • https://mtestbd.com/assets/uploads/files/43025719989.pdfIn PDF document text
    • https://basisnomor.com/contents/files/20696495146.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/4ed3043cfcca987a914db843883ec03f/24951952420.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/84458828122.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/bupumawedepa.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/72168752410.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/161490652011c4---499111066.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/datezegosi.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/notipinubinolud.pdfIn PDF document text
    • http://jadever.vn/Images_upload/files/44325335412.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB973 16736 bytes
SHA-256: 9af85f156a76ab049b5b033f6390c8fe9c4df5b10ff3a150b2af6d084aad4401
font_01_sfnt_off0000e42d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42D 10664 bytes
SHA-256: ba99327587883d645d8a8600c3990553f287d54f924228adde7b932e02d6d508
font_02_sfnt_off0000fcbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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