Malicious PDF — malware analysis report

Static analysis result for SHA-256 2511c9091e9c095b…

MALICIOUS

PDF

90.9 KB Created: 2021-07-18 13:12:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4b3e447b7fe916fe77d6fe88908e63a2 SHA-1: 898fd4b0d1bc08d166fabe777ee1b5098668bff1 SHA-256: 2511c9091e9c095bd1134e3f7834e61d41e4dd6d9cb42781f6c5f93549a59a62
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, directing users to multiple distinct hosts, many of which appear to be compromised WordPress sites. The embedded URLs suggest an attempt to lure users to external content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16085060439fc8---41747166546.pdf In PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c579a507956---bumubi.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/kudujavevuj.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/kopapofalobawiwexikixusid.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/bezubatumi.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097fc023335c---34907030586.pdfIn PDF document text
    • https://kientrucqhouse.com/uploads/image/files/79093566118.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/5204016a8965d1311dde572ea6e51f07/81768146995.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/alf4g88v79e2k1ckg9daphs0rk/53176337721.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/38118349071.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/ab6726cf2a54935a84a45da1079c5df9/21031413734.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609173d63724c---67737611050.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/solugiketiwijifewazupoj.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/74465874483.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/49419594292.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/55151674390.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/banonalogazomajujexes.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbe0919de5---7281981888.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/2f01aa1df2fa5ab29e0c802cea324302/50180288614.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/43a967fee5ed5cb5fa24bce7bb1966ef/terijibewuxo.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/pokubaxuz.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/dazexiduwi.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/lugugiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=value+of+r+gas+constant+in+atmPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1f7c39014---82427562784.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000deae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAE 10748 bytes
SHA-256: e66ae5d28abc2a0731da9b5299bc27fa90e1f85d013fa01cc7307b533cf09722
font_01_sfnt_off0000f76d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76D 16440 bytes
SHA-256: 7e292b4f9fe933fba59ba79cd95e7062bda0c1917cf0056597c6671f7c7445d3
font_02_sfnt_off00010e25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12637 20076 bytes
SHA-256: 5fa11c120835a3648318535455f238d5e86d04868138f169402509f00bd34ccc

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