Malicious PDF — malware analysis report

Static analysis result for SHA-256 468551e1efdae2df…

MALICIOUS

PDF

83.9 KB Created: 2021-07-07 03:31:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a3af8105b8f6e7473641f2006b21c73c SHA-1: 90dd3646a0b838358dc346d958080c68083ee192 SHA-256: 468551e1efdae2df7a21e0b29f37f62433f3ef03a79f821bea7138fb201d0bbe
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple external URIs suggests an attempt to lead users to potentially harmful content or phishing sites. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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://pistant.ru/uplcv?utm_term=4+pics+1+word+9+letters+daily+challenge
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073fb7c02580---23393118715.pdf
    • http://clubesquilacoma.com/uploads/files/39220237004.pdf
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/er8ke1mn7bmboav8ehmd8fad5a/fejigifubemot.pdf
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16090269fd5a21---30941990162.pdf
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/1b573d9453af89f492acf9c65d439eca/89516342952.pdf
    • https://rkdestate.com/userfiles/file/jupimavamegalevoxokuraki.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b3d48dcec---70564865998.pdf
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607927e169490---96234890864.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec1fbe7766---vesipebakok.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9548d9b6e0---jazoradunuvetafuwab.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2dc1ea427d---94122881162.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16097484d9e072---15341296956.pdf
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/aaae74b4acf7b7177d68887992ebd87f/82078792904.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb09e229f1---leboxopaloluxapedugeka.pdf
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/qvq4u6sjuhsmi49rp0f9ds8v8b/27869846349.pdf
    • https://mt-creativestudio.com/ckfinder/userfiles/files/wubebomogiruworafaxuku.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/3284f9230eb7d7525ffc8d7625640a69/60845822966.pdf
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/cf9a8704a2355f854bf8084d312339ed/77624008680.pdf
    • http://walkofagesvt.org/clients/0/0e/0e42319052772b195a43ba3ede0f03e0/File/52384744471.pdf
    • http://wittlich-luexem.de/userfiles/file/86241278998.pdf
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986c7ab5b66---womikoxe.pdf
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0aab6bca46277dfafe6b8dd6d249a6c8/96369132229.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ffb3434433---9601516236.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_off0000e38e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE38E 16792 bytes
font_01_sfnt_off0000fba5.bin
63600fd94785db61d477452be52fd5789909713e6df8cccfdd6cdf629d006033		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA5 11192 bytes
font_02_sfnt_off000115b8.bin
fcb9cc8616a51db6e0865a5ea9d9b8e1ff41947e60c02600813bc9270caf036c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115B8 17160 bytes

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