Malicious PDF — malware analysis report

Static analysis result for SHA-256 d573f6931108ead0…

MALICIOUS

PDF

73.2 KB Created: 2021-09-08 04:45:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d25745313466a14598bd12596fb0148c SHA-1: d91c10890396e5eacfee9d38d52cfda225e67398 SHA-256: d573f6931108ead02a3073615eed33a3306abf411905118c42e423a4ef62264b
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing sites. The presence of a link farm on compromised CMS upload storage suggests an attempt to disguise malicious links as legitimate content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://fedico.ca/upload/editor/file/kiboremiv.pdf In PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81889920178.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/94197453629.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/85025916178.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/taveweparafas.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a962e32730b---wikazemunatamexudovufan.pdfIn PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/73505186872.pdfIn PDF document text
    • http://budka39.ru/files/sadunumeg.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/rutosekejevizomazisepoxi.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1611688e05299c---pekekatidegi.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0908/7575094f004685b8077f8d72e2694240.pdfIn PDF document text
    • http://bona-agra.pl/Upload/file/91608700061.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/mmivcgvq02cm26e47ubjscg6o0/45704970518.pdfIn PDF document text
    • https://chpcentre.com/files/file/kegosemoboruji.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/vefananoxoxafijoloki.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1a1c4d928---32545505761.pdfIn PDF document text
    • https://o-dance.com/upload/files/gukas.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a1ed1ebfd---83636262486.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16124c24781618---xuremibeke.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc1f5bf0bb---41695142930.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/f9t89h0nm9edjqqfmml7rhlo2o/10949858394.pdfIn PDF document text
    • http://stickerbarcode.com/file_media/file_image/file/vifagasegix.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/20125236199.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/69531916655.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/notigikiduwovesavapala.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/e13164b0eb4625f701044569eea471e3/lakuzugol.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/6210791284.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=incisiones+quirurgicas+apendicectomia+pdfPDF 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_off0000bb91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB91 11112 bytes
SHA-256: ea1eee321df6243d6a9f72c53f010c8d94c63e16b63070452461229b36e64832
font_01_sfnt_off0000d504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD504 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED16 16332 bytes
SHA-256: c0ba844fe50d12904122749f6c8057164d38acaf31d394fb516ab5c77c91dfdc

Open this report in the interactive analyzer, or submit your own file for analysis.