Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d8c802ad7adb92d…

MALICIOUS

PDF

94.6 KB Created: 2021-08-02 01:45:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 66bbeaa1a58686ca76649df2306b47a8 SHA-1: 9c1541a38d69d2ca2d3c9a3de49b6ae957d95ebe SHA-256: 1d8c802ad7adb92d76fad1549f91247b2be86aad1eb71ea99f2fe0bc0b57d299
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The file was identified as malicious by ML classifiers and ClamAV. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to other PDF files hosted on compromised websites. This pattern is commonly used to obscure the ultimate destination and distribute phishing lures or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 https://gionggiacam.com/ckfinder/userfiles/files/28786313971.pdf In PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/5fc28a869d4aa5b1173e60a7524f3990/40115038623.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b6d606aa7---36547240949.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/sinisifipowu.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/10561838252.pdfIn PDF document text
    • http://cityhigh78.com/clients/2/2d/2ddbae4fb74c169819b3574d76e4e264/File/mineve.pdfIn PDF document text
    • http://nhs-carpediem.com/clients/46367/File/xuzofobatajowafafegem.pdfIn PDF document text
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/908fef7233253f524ee2bf8a74f1de36/gagapatoxameduxagol.pdfIn PDF document text
    • http://whs1963.com/clients/7/75/758a827d59fb1c2827eec60421ffdc22/File/nidevep.pdfIn PDF document text
    • https://www.foundationofhope.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607da952e830a---wevawejixixidadilatapitu.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/77414936692.pdfIn PDF document text
    • http://theshippyfamily.com/clients/57051/File/lukevesa.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/vt65ulu8v4uer9f08pdnbih9hj/9986700584.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b5beb41f5fb---51716963088.pdfIn PDF document text
    • http://lucann.com/Upload/file/66133413807.pdfIn PDF document text
    • https://basisnomor.com/contents//files/posezitudawama.pdfIn PDF document text
    • http://myredm.ru/uploads/file/zexijabed.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/37c65584b699de0d2ddf63a92d9eab4e/wufesumafawematebeko.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878cd4a4749---18593396509.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/c60d624323256a4bf88a7268ca54d378/52617411814.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/bregft3b2gbdcomeqt0q604l5b/tizufemel.pdfIn PDF document text
    • http://socukorglutamatmentesfuszer.hu/ckfinder/userfiles/files/sunafatabex.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/a905b62eccdde59db320c4aa03c9bfaf/gadigawipob.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210702_9119B289EBF638A2.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=livro+salmos+marcia+fernandes+pdf+gratisPDF 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_off00010bbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000123d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D2 10984 bytes
SHA-256: b4c70567cb738ed8158614bdd53ef50ac1a6bbe7996a5d2238440721d00256e1
font_02_sfnt_off00013d24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D24 18552 bytes
SHA-256: e3bf46e1a8e1d67c47a98623853d8c86534334a0e9021264b4913c09f94017d2

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