Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b5dba8aefcbb488…

MALICIOUS

PDF

115.3 KB Created: 2021-08-29 08:24:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 3276f04f33b7cc4b02647c919a6a4489 SHA-1: c24a15e9a63caaf92aa5df79c27cc27aa187a822 SHA-256: 2b5dba8aefcbb4887830ed146da6f52f2fea56c63c3d8c19381e30633c2c8246
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external websites, many of which are hosted on compromised CMS uploads or disposable domains. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly suggests the document's purpose is to manipulate search engine results or host phishing content. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

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://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160995e9d707a3---sowuradaze.pdf In PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804e7fddb10---suleletewimelemagezo.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/gixonifidag.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/43169077980.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/78433469070.pdfIn PDF document text
    • https://digireg.sk/upload/jojazobigodefujidezikeg.pdfIn PDF document text
    • http://eksan-ltd.com/userfiles/file/redaf.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/5d278f14af0a14a483e866ec34d11344/wokemojaguvixexeludewafid.pdfIn PDF document text
    • https://nidi.mk/ckfinder/userfiles/files/kopakizumuvabetakik.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608494107cff5---37116753988.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/8d55fd09988559185e95f5df52000664/torepisaziza.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/getugomiw.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/46029041843.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c464d4c22---xofezebexizelesele.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160fff8a2a14c5---90533236955.pdfIn PDF document text
    • https://botroul.be/uploads/finawefopibefupatusefid.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/32185414014.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/fcdf860d6b3f9f3b9d4a31dd80ab2c09/55901543909.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160beec64d7489---nukebimat.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16089fded5738c---3604863949.pdfIn PDF document text
    • http://uni-soar.com/userfiles/file/zejisujekil.pdfIn PDF document text
    • https://profession-your-dr.com/uploads/files/202108161543155529.pdfIn PDF document text
    • http://wamer.org/userfiles/file/70362408438.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/99074946732.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/37319549194.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021062420554873499.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/40023741192.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=angel+and+demons+book+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_off00015c4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C4C 10764 bytes
SHA-256: 3395efffaea1032b2d3ca92450daf7dfdba50e0c083e5c09ec40f1d7a7639536
font_01_sfnt_off000174aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174AA 19096 bytes
SHA-256: 293f6349b368e3bcb72178be2228d1459b1d7abd8206c45f99a1cf0421d31d37
font_02_sfnt_off0001a67e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A67E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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