Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f603b953bd531c1…

MALICIOUS

PDF

84.2 KB Created: 2021-09-05 10:08:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c9a4f058f711fdc438b9eb2765f4e903 SHA-1: 48da9499fbc02b77b10a9d8a09045de65117cc5d SHA-256: 2f603b953bd531c19d0efee1f109ee32b91d21e087cf6a51adf595ad30d108d8
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it's designed to lead users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the link farm nature points to a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/b415da2800bf460c472d9f576ce09fb2/84989477824.pdf
    • http://phonphangschool.com/upload/files/japapojumozevirizeka.pdf
    • https://kozhikodedeaf.org/admin/my_files/file/44523594021.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/664d2dc4df5e03932661acc7192e53e8/letavomud.pdf
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/ko8v60fasmpie85s1cmguc3vtb/5211972588.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d7bee5c1d1f---somuvunaxudo.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a87fde21385---dujedokez.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/af6e3768948c2d1100aac8de9e78d5a9/9554599960.pdf
    • http://carszana.com/image/upload/File/70391340495.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/922725d669fa727a7a7c8393ed16dba7/90733227920.pdf
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/d0106c86f062fc703d4ba0d3a86a0974/87892849209.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c050b652b---fabokodafepaduv.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/dbd7fdd39b15a9c179c1e6fbb240fbf4/bikukezajepamasel.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/825ef7fc273fadf7fad781ff1b2a7265/97856017191.pdf
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/csttcd8cs1m69ab8oqmobeujqe/megad.pdf
    • http://1-champagne.com/blog_images/blog_/file/jufizedajoguxufavudunaz.pdf
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/cbf3d1bc2bef948d057ca0e9a7b024a6/12206300703.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16078809473fb0---lawitorojikavefa.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608b41ad53a58---82689033997.pdf
    • http://2440027.ru/upload/file/bedebeseraz.pdf
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/7j9v4cb67kso5aued0e61a1n70/pigadedasiwepiwabuxad.pdf
    • http://blessingsngo.in/userfiles/files/wixobozunexuvemusivurer.pdf
    • http://ptairsupply.com/userfiles/file/jepomifozatoxizuzusizeva.pdf
    • http://rund.cz/UserFiles/File/13311114785.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160aa21497e212---bikezi.pdf
    • http://davcpundri.com/css/file/6484185713.pdf
    • http://topliving.sk/userfiles/file/xupimupadubisodomatoj.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=contaminaci%C3%B3n+quimica+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_off0000e0d4.bin
bb98e3f7bdcfb04c2bd24ed1333c2149a43e81b7b27b7ebca6f8e2559ec477ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D4 18848 bytes
font_01_sfnt_off00011101.bin
75ba87d022bb5f72d9d5a396fdc1e33047338fe968585559f95580f64235306d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11101 10752 bytes
font_02_sfnt_off00012943.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12943 16792 bytes

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