Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1b20f0b08b877d1…

MALICIOUS

PDF

96.3 KB Created: 2021-07-03 00:18:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 78cbda9f510d7ba1c6d7f287128217f4 SHA-1: a8df0ff0f18787d7d9301ba82343c17fa998792a SHA-256: d1b20f0b08b877d1014f06a58c4fb2dafa91a38381f23fdbac5f27eb799894ee
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to obfuscate malicious links or initiate further exploitation. The presence of a link farm on compromised WordPress sites, as indicated by the PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, strongly suggests a phishing or redirection attempt. The ClamAV detection and ML classifier further support the malicious nature of this document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9768

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 http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1606f64bb42c41---79537625017.pdf
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/4903745460de1e9bcb93a.pdf
    • https://abugfreemind.com/userfiles/file/28499396943.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/844568d1b3d72c5d54b37ab1f17c036f/zizazado.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb52a2d321---jaledipudusuzi.pdf
    • http://ruoumoc.com/upload/files/80543267900.pdf
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/117bbff5040c57770b16007e2fae05a8/41204963695.pdf
    • https://vansuloi.com/uploads/userfiles/file/xevovosokalirakenigumetug.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160baae96af9cd---41174458169.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606d890c62a85---8360009953.pdf
    • https://guruamardaspublicschool.com/userfiles/files/mitijemadumupukux.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16085434369d4e---fetewawubibenijepob.pdf
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/fdfe631fd4b4f295a9bdec126b159dd5/80871672789.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da4047a852e---riranovadaxudojifokemivi.pdf
    • https://ludifrance.fr/userfiles/file/mukuxefiparesexagowalo.pdf
    • http://hiace-yoshikawa.com/js/upload/files/terokijaxasun.pdf
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210609_F2049C434A6E3506.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16079c168a04e9---gudoguzasarepefetu.pdf
    • https://cortemadera.com/wysiwygfiles/file/rirusura.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160b41102890b0---13036169385.pdf
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0c8ddd05a---xamagoruxu.pdf
    • http://anaminfo.com/attachfile/file/fepon.pdf
    • https://baongochoa.com/upload/file/8619135982.pdf
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/q2vqo4sr8291l48hlt3e079kbp/setimi.pdf
    • http://adamlegal.com/userfiles/file/simesawexemunavexafinim.pdf
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbbf78aebc---48491082581.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=antz+movie+questions+and+answers
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fdf0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF0 16792 bytes
font_01_sfnt_off00011602.bin
448785cfe957baf6602e1d3501ad20d4f02e810f1d48bb425fa378761e407a16		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11602 18096 bytes
font_02_sfnt_off00014527.bin
217f2ffd2bddc4326fd376f67bc4162dec7b8fb9aeb1b8a9a4bb6115bcf92e24		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14527 16196 bytes
font_03_sfnt_off00015aed.bin
3eeb2851e0f997fc24e4b3435c5db23e93d2d39254d6dcfa25c26a2ca1664e6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15AED 10804 bytes

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