Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e115f8d633cf556…

MALICIOUS

PDF

73.2 KB Created: 2021-06-26 22:25:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 3643fb245bd7c497aa6b8cfed1e87dc5 SHA-1: b126825ad40f18039061d9d4046703b6318ad1d1 SHA-256: 6e115f8d633cf5566fd7c73dd66d50ef4aefdfc3ecfcf990794633fc71fc7338
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains an embedded JavaScript stream and numerous URLs that form a link farm, pointing to compromised CMS uploads and disposable hosting. The presence of JavaScript suggests an attempt to execute malicious code, likely to facilitate further exploitation or phishing. The link farm structure indicates a distribution mechanism for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://cructi.ru/uplcv?utm_term=practice+worksheet+graphing+logarithmic+functions PDF link annotation
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/86fdc0955c1fef54457e7bb92a2a3bb6/kezuvemugof.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/diselowufinoxi.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210604131200455.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/2s2mtgo1tg8b5s7k395a933o0h/51211876963.pdfIn PDF document text
    • https://southwestlooms.com/admin/userfiles/files/28603539840.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/46n51b78csrm1sa6153crji520/rijurubulatidaguwok.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/mosojefixoko.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/c101f17708a684f6dd581a950e8bcc12/tavukiwezerixakolig.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e904edfdd5---kepukuvaguviralatifiril.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776d70d8357---55000321248.pdfIn PDF document text
    • https://isosklo.cz./uploads/87185949275.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/4904e4e8a8bc7c6a932d71331d799d39/56104235790.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e3a20bdfc---44620748247.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/suwakazumazutofopelixe.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16098d9e354c2a---wotavolijefa.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-5-23/20210523173314802364.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/56bbd329f11917ff698e35d05804fc28/20177979586.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/41087a49d8698614170b7f8cacdd4101/jemidolod.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee1e1a04d7---63869389653.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608839ccddf56---47027915355.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/6903f7e20fb8ecca4acba62f5531b749/31841642517.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a45f51c7281---dijuxudebi.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/jedison.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/89905118269.pdfIn PDF document text
    • https://iwnta.com/userfiles/file/torifonopubivazigele.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#Referenced by PDF JavaScript
    • http://purl.org/dc/elements/1.1/Referenced by PDF JavaScript
    • http://ns.adobe.com/pdf/1.3/Referenced by PDF JavaScript
    • http://ns.adobe.com/xap/1.0/Referenced by PDF JavaScript
    • http://ns.adobe.com/xap/1.0/mm/Referenced by PDF JavaScript
    • http://ns.adobe.com/xap/1.0/rights/Referenced by PDF JavaScript
    • 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_off0000bcb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCB4 11204 bytes
SHA-256: f2cccedb40eae504faf9009e745bfaa300761974ab33c1f47e6f576ffee9bc24
font_01_sfnt_off0000d6d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D3 15708 bytes
SHA-256: f6bc1bd0d30714ebfc23103194e791b84145952904393bc431b0d8dd51aeedb4
font_02_sfnt_off0000ff16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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