Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d9c71cbdf9b72a4…

MALICIOUS

PDF

75.1 KB Created: 2021-09-22 13:47:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3a4e4bf42bfa9138ab393217d6dd5980 SHA-1: 1188576c304b7a7782dfd6e8de7e7ce9cc6370c3 SHA-256: 4d9c71cbdf9b72a415976ad483cbcc62716ba152a0ae420ca061fce96933710b
124 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. Static analysis revealed multiple heuristics indicating the PDF is a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting. The embedded URLs and the overall structure suggest an attempt to direct users to external malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3851

Heuristics 5

  • 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
  • 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://inwebjor.ru/uplcv?utm_term=world+of+warships+play+store PDF link annotation
    • http://eggtesting.com/admin/uploads/file/livokawerezusijiku.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139215f87040---70700395557.pdfIn PDF document text
    • http://fermobkorea.com/userfiles/file/20210913074701.pdfIn PDF document text
    • http://gskrem.ru/img/file/81228851130.pdfIn PDF document text
    • http://vip-cond.ru/userfiles/file/79056102723.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/tirivadu.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/e5c658aa71b7ef076b0eec7423f78870/kutiziwuwovabozopew.pdfIn PDF document text
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/xojalamutubuvaroxogezuvul.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/jonebawolibemagapinakob.pdfIn PDF document text
    • http://carbonelite.ru/file/lewarideriluguguredotub.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/gisawusasuvabuberexozeri.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/89537368254.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/7828998624.pdfIn PDF document text
    • http://shop-exclusive.cz/userfiles/file/kajagituzewujepiram.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/nojeroretibutobapudezat.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/161407aeff3714---gejizat.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/jefazafalowigigofara.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16130af6cd783b---vurafapolixujot.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/20944451182.pdfIn PDF document text
    • http://squash-fitness.cz/userfiles/file/banepunibomedasusigep.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/77701194811.pdfIn PDF document text
    • http://seychelles-resort.com/images/blog/file/riratibifel.pdfIn PDF document text
    • http://greenworx.eu/images/uploads/files/zivafateduwamaxavixuxewi.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/gareruwojugirelegub.pdfIn PDF document text
    • http://bapassamarinda.id/assets/ckfinder/core/connector/php/uploads/files/fukexiruxu.pdfIn PDF document text
    • http://epoptavky.com/is/images/FCKeditor/File/velojosunu.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AC 18120 bytes
SHA-256: b209586e6d5d73a10aff399049b347a1ec339108a1456245441a2ea2f489e9e7
font_01_sfnt_off00011549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11549 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1