Malicious PDF — malware analysis report

Static analysis result for SHA-256 a590259ac139ee55…

MALICIOUS

PDF

91.0 KB Created: 2021-06-25 20:34:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fb5f175e33160942823bde2c9aa31d3e SHA-1: 7e4a17e9d3ca5c629109f56300e046c9c6c55e7b SHA-256: a590259ac139ee55d08781963e17f99c5059003af28a1533bef157ee66425fb9
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, indicating a link farm designed to host or redirect to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL analysis point to a common tactic of using compromised infrastructure for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://dakmet.pl/upload/vesetutebefez.pdf
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/13084a235f7b4232cd51e45bea11f804/20651757691.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d449ecf1cf.pdf
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c260f7b9f54---94559576899.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/657d2953746a95a699a398d291f1ed96/23870701310.pdf
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/6bfce47ec181b473ecf2b3a35a71c62d/gesinebezavut.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2d8a96f8a---20935552432.pdf
    • http://suseefinance.com/userfiles/file/sajirawegaz.pdf
    • https://liderpin.com/calisma2/files/uploads/zatonefefasafigipoxe.pdf
    • http://gialtour.it/themes/userfiles//files/24483616092.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d27163d781---sapagidasuxafavud.pdf
    • http://splogservice.ru/content/file/65139086845.pdf
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16072317fa7190---zuwanunu.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708f0ba0cbd---mapibifutafeloge.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/9a3000283a3db9fc693df07fa42c6ef2/nunefalesil.pdf
    • http://74ahs.com/clients/2/2a/2a132ee8da0778863662fd4b1fa251ed/File/lerimelomuveg.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ced3361d0e---63656620954.pdf
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/21d13c7c53faa337a02e5928e22eb9ad/9607940602.pdf
    • https://beytarimcilik.com/admin/editor_resim/file/xawazufopudapadove.pdf
    • https://ascinfratech.com/clientprojects/trading/file/17329286772.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef4f9d44a7---bedosivuru.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1608c60857f03d---puvitatufigibuzusipur.pdf
    • http://challendor.com/fckeditor/upload/file/ratedamanuzetitapogijef.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d005ec6122---jataxazobebilewewebe.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606ce7d8b20ce---51083271658.pdf
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086af8a09419---jixawegigibukukanan.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+do+you+say+are+you+good+in+spanish
    • 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_off0000f82b.bin
82ef4d2710031cb0741ab2484151098b70a33ee7d940099ce477e03e8750fccb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF82B 21032 bytes
font_01_sfnt_off00012d76.bin
72f4e825b12ad879ce126270692039a990c9bf0c306288a0642fe3763422ab73		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D76 10816 bytes
font_02_sfnt_off0001461d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1461D 16792 bytes

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