Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c8b70f73d54dde6…

MALICIOUS

PDF

73.3 KB Created: 2021-09-19 05:16:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5a43f60c64ffb7ed04f9a43b82606dd2 SHA-1: 08dfc1a6565885c1de046657425045dce8afb664 SHA-256: 2c8b70f73d54dde6b334dbf534e559c2beb2ff0582cab8fcd7c94c3733a1716f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to potentially compromised websites or disposable hosting, indicative of a link farm used for phishing or distributing further malware. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://europavloeren.nl/siteimages/file/dawazewotinobu.pdf In PDF document text
    • https://copperscrap.wasteequipment.net/ckfinder/userfiles/files/lepadusijawutokagojavilil.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/33165661836.pdfIn PDF document text
    • http://dafangtour.com/fckeditor/userimages/file/68710759629.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/wikulifopuxuve.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161467b9b3d151---60954375634.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/rolikakalubinunikufejude.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/46239482129.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/lavisabanupu.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/56031607808.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/ravemofuvowefobi.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-7/20210907065919367629.pdfIn PDF document text
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/zigigemuzafedixof.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/29838764460.pdfIn PDF document text
    • http://exosushi.com/uploads/files/fejuwetiv.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/rifewenovugarolineg.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/64598937743.pdfIn PDF document text
    • http://tid.vn/upload/files/49492778616.pdfIn PDF document text
    • https://activepymes.com/pub/file/fobujatuvazobo.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/70053207537.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee00ddfe5e---lizudexopemobagixulixop.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/nopuwupulupaserefomudux.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613263319c684---jipaxamevibesupepegijor.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/161414351ca4dd---91067218198.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/19424234269.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=below+her+mouth+watch+full+movie+online+123moviesPDF 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_off0000ba32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA32 16672 bytes
SHA-256: 9b6d889139417bf003c3aaa1a2f982e72372797034f1597d038bad8c083ecc77
font_01_sfnt_off0000e459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE459 11252 bytes
SHA-256: 56ee48ac692f846a973f5a7c8b2211e8eaf46b488961e7bd230d4a37bd8570bb
font_02_sfnt_off0000fec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1