Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c34f326d0fcc7dc…

MALICIOUS

PDF

85.2 KB Created: 2021-06-28 17:25:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b185d1e28717a6e443e345afc4591776 SHA-1: a811e47cb2a4b29e7576502d127045e5652946cf SHA-256: 3c34f326d0fcc7dcb0d1b8688d4d7612ec46fbbc2e6e89fad426d2a966608d43
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. It also exhibits characteristics of a link farm, with numerous URLs pointing to external resources, some of which are hosted on compromised CMS uploads. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to facilitate further compromise or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • 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://frontlinetherapist.com/wp-content/plugins/super-forms/uploads/php/files/0806b37cfe52c06748f0f0102a6645cd/gadizatudon.pdf In PDF document text
    • http://tuzvedo.hu/elemek/file/71689956810.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/31d0d76cbd0cc8e6af39d9dd9b3b8af1/fazugatalixuwuti.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ea2c001b8---rodizomadodap.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de6f9045c2---84115214819.pdfIn PDF document text
    • http://dogoducthien.com/uploads/files/25655130386.pdfIn PDF document text
    • http://wajl.net/img/file/202161022513.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ccfb57ac821---wofikebemuk.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/xakutakebowisuged.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/6cf7515e3afde1200c75992118e81e0d/96146767716.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/11545420121.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/5e8b3e1c29fbc8bcd0938790da6a1734/9445331988.pdfIn PDF document text
    • https://motacademy.it/file/wonulaxaleta.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd5116f7a5---wijedenalad.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/c98c7ce44683f63d99e2d22ba44de2f9/xemuresuweto.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d3616ed98---61292389594.pdfIn PDF document text
    • http://apvn.info/userfiles/file/71627885344.pdfIn PDF document text
    • https://nasroglobal.com/userfiles/file/bokagebugitinu.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/5136996663.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/31465745461.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/etuvicn5vqpvc2c898rah06u6l/foninozo.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1609e02bdd0804---delazekol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+hold+a+lawn+bowls+ballPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/e39dd0ffe2d972a0a61112fa7cdc8626/sinotiwere.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_off0000ea1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1D 10236 bytes
SHA-256: cff5e0e92982f004f20681fe4f2808c631cb28e26d4fe1061c5abd37916e1a79
font_01_sfnt_off0001010b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010B 17256 bytes
SHA-256: bfc747f1cb35019e8fd3c25f45fc53850fba96a0890085efaddd47e6e9c7bfc6
font_02_sfnt_off00012e15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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