Malicious PDF — malware analysis report

Static analysis result for SHA-256 e61e5080eb18319e…

MALICIOUS

PDF

81.5 KB Created: 2021-09-01 02:56:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 70b7e5c1d092a67402914881feedc8f2 SHA-1: ec19dc0e5e97de9e766aedd0fd6e32194a2e9145 SHA-256: e61e5080eb18319e44db4af369bde72f1bedb763ef18790400f9946b59cba495
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing lure or a downloader for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

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://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/964fbfa8215dd25f4acddd1b62227633/27120006441.pdf In PDF document text
    • http://maduraigarlandshop.com/userfiles/file/rukapesutesopemizotosa.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/junumedoroxon.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/17306a97c2ed48d1cd93fcf4d8f65617/godelax.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ecacba4087d---63141204029.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/17716930417.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/d90451060313309812860a50304d9d66/gijutatebemitumitoziloxa.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b97b857f3e7---ganazepefobulobupunul.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/29567134494.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/pukutuguxiluperawub.pdfIn PDF document text
    • http://sehs67.com/clients/e/e0/e078d4d0076166a7bb489ca3b3a583ab/File/71886067522.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/67119963804.pdfIn PDF document text
    • https://alutat.com/data/file/50294243111.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/723853cac17f9f0f48e21178f758d825/87943882897.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/23ea4075ea5e78798a70bed8bb6dd41f/23070908345.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/93654077065.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c71120f6c2---26252911822.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/babuluvojeruvepefeg.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/2458358389.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/c07c9ec697ec73e81b4d6ac47e807974/23625005428.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/bcb68831c69c85f572a5391f59140f2d/rozixirija.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/29b5691cc63ba255474c4495e928e1f3/japutofimofonudoginuz.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/n43a27jj03jre7p8o9ekbcdbsr/7669570442.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/xovegogubikenexokomibin.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/nopitokogaduwifolo.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/25809671007.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=harassment+meaning+in+bengaliPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00011e52.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11E52 16908 bytes
SHA-256: eb91644580e94bd1461b5fb0b2490d22c0a0ba948fd7670d0943d6d50bc5b2ec
font_00_sfnt_off0000ba85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA85 19900 bytes
SHA-256: b76980963a0c8ad5a3260239965f6bb341b84a4b8dbdfab4d9dac9a67b9ca982
font_01_sfnt_off0000ee8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A5 10464 bytes
SHA-256: 64b80cc657ce259167e23d8dc644e56c76d326620b81b7d704fab1910177df6a

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