Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb1abbb72eb5256d…

MALICIOUS

PDF

99.1 KB Created: 2021-07-02 18:52:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b0775b749b16ef4043a150aa1ce54c86 SHA-1: 953b4a4fc0ecec9e03b4081dc13db02b31d6a0d5 SHA-256: fb1abbb72eb5256d55242fa4776cf6c0b9ae827e01e13e792263306c6c87f766
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Additionally, numerous URLs were extracted, many pointing to compromised WordPress sites, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier further support the malicious nature of this file, likely serving as a lure to download further payloads or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9872

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://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/820b81512480c0c63f3089cd1ef31a62/86102560648.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072c3a578329---kotapukipuzesokifax.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16076b21a3b850---18245408096.pdf
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/5d8c1774535476bf869400d36f58ecea/78852928297.pdf
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/e6tivgkjjudhufu5epvvkkk13b/jabumizerotuniza.pdf
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/6h400m90osm9iutcm84lp4a1o2/xamenebuxewogixixapu.pdf
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/e3598s8v9ps4aj3f1h5k7oih46/nusekosuliwukipinigofi.pdf
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16087842a350fb---zeliv.pdf
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/tplcrndb3kh20qk2jlm9gnvg2m/minefujenafod.pdf
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/027a8b6f45655a4bc99817bc43da2872/zafetitiwuzegasajotobov.pdf
    • http://knuhpharm.kr/userfiles/file/20210630051607.pdf
    • https://arerp.kr/data/file///telanabuz.pdf
    • http://oreade-breche.fr/userfiles/file/biwowabaxagoges.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a2bc5d19632---26180647615.pdf
    • http://morethancars.nl/uploads/edytor/file/86039088329.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/fe14fff34e12d21caee40dfed2bbb7ae/17988860765.pdf
    • http://cosmeticdermatologymiamibeach.com/uploads/data/files/temobovo.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089f9d546920---jisodapuridowosep.pdf
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/pasajarufezurajuju.pdf
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/8e5d04d6a65536acca9916793d17190d/mewulozevuditewoxasuvi.pdf
    • http://beloezoloto.ru/userfiles/file/wuwotasotuwufalelimakuwa.pdf
    • http://akicgiyim.com/userfiles/file/64861134827.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/9j75qcccf7g90dg739lmc0je7r/89672653603.pdf
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/16838708928.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=lesbian+daughter+seduces+her+mom
    • 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_off00010805.bin
e4cd408809e3901c9d96cd85f992fb2462a12d6dae69aaa0c8ba71b1bc394209		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10805 16500 bytes
font_01_sfnt_off00011ec6.bin
5ee20e8a046573e8f62922cf3d4e997dd7431f33b532ba268e22abdf2b9bc131		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC6 17780 bytes
font_02_sfnt_off00014d32.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14D32 16792 bytes
font_03_sfnt_off00016549.bin
58cbb4d39facb33de04565516166cc1aa2104ac5f029615fa6284029e37e8f67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16549 10968 bytes

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