Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a2eaf0f23093dc5…

MALICIOUS

PDF

76.0 KB Created: 2021-06-29 16:15:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 706a40b2c6048d9f6156aa3ea5c4e4c7 SHA-1: c1c245ca51b61b4d02880bdb7390adfde2f3da6e SHA-256: 4a2eaf0f23093dc5fe1207fef9fafcbfa79e136484a9682ce2de1038cca8d2c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple websites, some of which are hosted on compromised CMS uploads. The primary lure appears to be a fake PDF download related to stock market investing, designed to trick users into visiting these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/803a6d879404662fbebbce4d259ef3a1/75578631727.pdf In PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/19195059280.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a82b6cdd817.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608da2f988c71---7293755182.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6590c389e---52763302603.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/7114039822.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/lepimorabefilevuze.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/ts0cbctc89ldcq8ojbcpft805t/24521680855.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/36457167347.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608125935bc5d---nonametawozugu.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16079e536cb22a---99009705652.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/358603db1702a700fb532c119f85ac79/dopubakedar.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/7ba0552e4868165225a0106e64eabaf4/mufulujuruk.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/doguxarezajigogid.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1606c92071a68f---tirudewineponeneba.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/39377833822.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b54b1459685---nakuzenebinegufi.pdfIn PDF document text
    • http://famillespourstarlight.ca/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/lajesovifuzogopoxi.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/numimuzumafodaf.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/80f1cq7toqu9bllfs73me2akos/fozad.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/71958070731.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7f49768f1---gizosasupepegudalejeji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=everything+you+wanted+to+know+about+stock+market+investing+pdf+downloadPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/45306046377.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c76c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC76C 15440 bytes
SHA-256: 9db06bbf2928fe3eaf9dcabba65beff4147ebd1554811ee292536b9425d314aa
font_01_sfnt_off0000eed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106ED 11648 bytes
SHA-256: 3796abd6491cf055c87a186b00478a1eb372bd41eca008b635bf3f7f40c188f9

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