Malicious PDF — malware analysis report

Static analysis result for SHA-256 571c48c6fc55e4ec…

MALICIOUS

PDF

88.9 KB Created: 2021-08-22 00:30:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 93f47fa2d67dc0d3be08a2f1469a1d8b SHA-1: 3ce3c4bca6ca91b699802b171877d78eff1935de SHA-256: 571c48c6fc55e4ecd92f68bcf264c522874db49a1f5b7ba7a2167a554ca0298b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and a link farm pointing to multiple distinct hosts, including compromised CMS uploads and disposable hosting, suggests it is designed to redirect users to malicious content. The primary attack pattern involves using the document as a lure to deliver users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://billionbosses.com/ckfinder/userfiles/files/88518590562.pdf In PDF document text
    • http://dungcucaytrong.com/images/files/61201282221.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/23657885911.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/jbrtapujg4gqpo332c8qs96vft/49256310001.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160adcc44d667d---26044737901.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/sapawenigojem.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/ml53ksvln18il01aphvkichs9i/wepagipa.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160960c26a5d0d---puzefinoka.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b95ecfc0d98---putozositovifad.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/k6p6a6s84rbrs708igquirsr1s/81225936709.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/mivugodanokugenafabopeso.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/h9ba0jmoklkkc7n829qr1eetvk/poduwafaguvil.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/44699082048.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/wapizo.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/8885f455b055f8b755e86813def720c5/84150235256.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce6a566db3---17204890254.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/82813698726.pdfIn PDF document text
    • https://www.zolmedis.lt/ckfinder/userfiles/files/kifewejubate.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee4597126f---kapukexuvekosarij.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c2c98dbed---vemijedifivatapudetelixi.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f390da5cc0---mutaviludesixaxexinuf.pdfIn PDF document text
    • https://chp-travel.ir/data/file/duxolalomepuzowofaxis.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/k8qln1kno929h8k9tksqkh1tvs/wiveditufireraka.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/dapozivis.pdfIn PDF document text
    • http://eurekaelearning.com/upload/news/file/dejavenomawexuxiramub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=%D0%BA%D0%BE%D0%BD%D1%81%D0%BF%D0%B5%D0%BA%D1%82+%D0%B7%D0%B0%D0%BD%D1%8F%D1%82%D0%B8%D1%8F+%D0%B2+%D1%81%D1%82%D0%B0%D1%80%D1%88%D0%B5%D0%B9+%D0%B3%D1%80%D1%83%D0%BF%D0%BF%D0%B5+%D1%81%D1%80%D0%B0%D0%B2%D0%BD%D0%B5%D0%BD%D0%B8%D0%B5+%D0%BF%D1%80%D0%B5%D0%B4%D0%BC%D0%B5%D1%82%D0%BE%D0%B2+%D0%BF%D0%BE+%D0%B2%D0%B5%D0%BB%D0%B8%D1%87%D0%B8%D0%BD%D0%B5PDF 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_off0000eb74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10386 20180 bytes
SHA-256: aae99ae8a9544968915ccfbd162f4c691da2c68b3fd1ce7168437f878cf49ba8
font_02_sfnt_off0001361e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1361E 11428 bytes
SHA-256: 799153d6d6356e5327c83d93aac0b2bbeca0cd139457d1eaf476ce3f962603bd

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