Malicious PDF — malware analysis report

Static analysis result for SHA-256 00acf9727d96e35e…

MALICIOUS

PDF

80.5 KB Created: 2021-07-03 20:46:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 938fd095107401ae8ccb32e5787e6170 SHA-1: f01f338801acb055b1d425282cc13a151c1a3177 SHA-256: 00acf9727d96e35e2f6bd691eb09001710d7a72173a1085953bea16f0550bf67
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. The embedded JavaScript may be used to further obfuscate the redirection or initiate a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://coretry.ru/uplcv?utm_term=cbse+chemistry+class+12+previous+year+papers
    • https://kodcomputers.ro/2664/uploads/kuliwamavidaxom.pdf
    • https://5uempat.com/contents//files/84843514842.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbe86d341d---zevorupuf.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d22aeb3af86---65928227512.pdf
    • http://jyjwqj.com/uploadfile/file///2021062803222086.pdf
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/33949de6be047e790b78aa6ec48ea3ba/bibugovopefiketivut.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/458c02fa9583df9a21ceb2208904b514/tideloxude.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16096bfe86b36b---48304229980.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071705450b59---50886372452.pdf
    • http://www.aportecnica.com/imagenes/editor/file/13701958177.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/f1c9117b87560eb8d98ad6076a2d8eb6/62454261616.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd32cd745e---45619234885.pdf
    • http://best-infosystems.com/userfiles/file/89937000008.pdf
    • http://pitin-akutsu.com/js/upload/files/31046560244.pdf
    • https://appfacile.it/file/14140648274.pdf
    • http://korean-school.hu/hangul/userfiles/file/30284326596.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/1dd1a13f87c169ed027d8daadb62643b/94271796456.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817f82b5ea4---32320231729.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4e9884d2a---daxarebimegapedel.pdf
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/63351111940.pdf
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/f3a24fa62cf251a3b87ac255ae55c2cf/31554116500.pdf
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/768ef4568b94f8d4f258d69ce9c0a551/97879403610.pdf
    • http://stlnsk.ru/uploads/file/lesogenilalazakekojuwun.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/o385pmsm9uamu1okegpil045br/musik.pdf
    • https://artlabjo.com/userfiles/file/20236405832.pdf
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/e85ac0d6160db9e61388f877a586d51d/ronozorobasosemanilofetis.pdf
    • http://bagumul.com/file_upload/spaw_upload/file/20210518194429.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d517.bin
5d7b0bdbd9d9ffbb6db44b02a78f6d724f8c41e5ca734e30149e55f84ad5b9d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD517 17176 bytes
font_01_sfnt_off00010217.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10217 16792 bytes
font_02_sfnt_off00011a2e.bin
d7a8803be3342d54d572d74ebd2f53c38e4f8c1e41554a0c026e5d2fa3d6b0e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A2E 11156 bytes

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