Malicious PDF — malware analysis report

Static analysis result for SHA-256 d81daa6a8ad50bb2…

MALICIOUS

PDF

101.7 KB Created: 2021-06-25 19:22:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 93416be058a8a638caf9a94c904e04aa SHA-1: 55c7c33b4bf7d6454a93a46f08d8a9627f9f7115 SHA-256: d81daa6a8ad50bb27cbe458aa31c9f1c7fcf85d6ed236b375fb2944f44890114
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits PDF vulnerabilities. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and a link farm on disposable hosting strongly suggests an attempt to distribute malware or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9708

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://allytemp.ru/uplcv?utm_term=rebuild+of+evangelion+where+to+watch
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/vb453g0h2rgbcabd3fb6qhmn08/vuledef.pdf
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/4c4f84d57e1c4c32bac562ba22ba20eb/69841965944.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/b0ffc8ef5a18738fa1f5ca9d1f511d1b/mudaboxugi.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/af00675e118a787458f7be17a36d489f/rosuwatos.pdf
    • http://goref.ru/files/file/21543058048.pdf
    • http://aldara-latinoamerica.com/userfiles/file/3955154957.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b685ebcec48---1900786645.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609242073edb7---tazoxemuz.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c38a4d2598a---sadel.pdf
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/57585653158.pdf
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/o4sp0a3s1d8j0cmmmcteq7vdvr/donesezerurugunejolofen.pdf
    • http://fresh-j.info/images/uploadedimages/file/gotifuguwi.pdf
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/d1cdaca4ce755d6a8e7382523ca20897/tagurateg.pdf
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/8ff73ae21b1007e34bb47b71c646d7ef/31783564096.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940d8185cef---36484331987.pdf
    • http://arcomproltd.com/userfiles/file/fabuvi.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/ea690de9a4256ca98a1f147fc0e18f6f/53315745195.pdf
    • http://kinel-hunter.ru/upfiles/file/29916925716.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16072f2870498e---89489931886.pdf
    • http://norilskgu.ru/userfiles/file/nasegowuzuga.pdf
    • http://bazis-expertiza.ru/ckfinder/core/connector/php/files/16280382995.pdf
    • https://vietnaminsight.biz/ckfinder/userfiles/files/46817604467.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/b3ed98e9e16c66cdc220210f3753ff76/luvegag.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607518b597986---lubisavozil.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5194280344a921978fcd7b72fe472578/69028956469.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2c04dfb0e---kanaxerafuzasirizob.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f87d.bin
f88f26ab12b6fea0af2d30a49b138669ba3058d67a7dacf24b9b3ac57b3c106a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF87D 13012 bytes
font_01_sfnt_off00012266.bin
7cd0d9b036d9bd0c8972dd91a7ec4a4ea7b6dd47c7f0c1a592257e89da108c2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12266 19740 bytes
font_02_sfnt_off00015720.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15720 16792 bytes
font_03_sfnt_off00016f37.bin
358948d19e287bc79fe702b247baaf308bb810823d467788484a11593303fffa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16F37 11024 bytes

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