Malicious PDF — malware analysis report

Static analysis result for SHA-256 606336c867cb9859…

MALICIOUS

PDF

219.9 KB Created: 2021-07-30 00:01:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 704032779b5508b8067c5cb9838a17c1 SHA-1: 13b3f016039e7ca0241092154c2b07b27af667f2 SHA-256: 606336c867cb985949144f1c30f4eb922fec9daf414b8bd4fa6dfae37c4521da
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9896

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/03851bcf8cf2f7da1e178bdea1a8122f/daforoxagodosadijaw.pdf In PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16096d1e38a239---28405154513.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/51871724291.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/xeduxi.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/c6e0640170bd01c0a140ff98b36040da/fivufagujeferumidudakeno.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e08366dea80---66118042209.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160958e94c63bd---gasukerunonogebebuzi.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c754ee724e---salijepun.pdfIn PDF document text
    • http://moderncarrent.com/user_img/files/77912351355.pdfIn PDF document text
    • https://peterdegendt.be/file/64649115890.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075767e8d40e---kikuzupagaxipelebunoxaz.pdfIn PDF document text
    • http://esejsc.com/upload/files/77122777012.pdfIn PDF document text
    • http://klhl.com/userfiles/file/mozulewe.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/qkh6at942ohmseldhirk6a6u3c/medekule.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/eqon68e778s6ohuf96ppla0t7o/dixotegasokewagimat.pdfIn PDF document text
    • http://dieukhactransam.com/uploads/files/govedalejuvexuvineze.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/44983013882.pdfIn PDF document text
    • http://kotolantopeni.cz/file/58895341186.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/277ef5b83a0fd4ce2d465c751b815834/28890365620.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/41772911731.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160dbc5c23f7c6---3744473095.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6e89d186d---62032050522.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=what+is+the+nicene+creed+simple+definitionPDF link annotation
    • 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_off0002ec7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EC7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00030495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30495 10880 bytes
SHA-256: 43d26d74f90ba69917e4a6eadb90d24307ccd1ffa4907e9504d2941d779a6052
font_02_sfnt_off00031d81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31D81 30204 bytes
SHA-256: f2fdf810069b75e1f719c082acbd6a62c7d7ba679d15520371f3fc4c26e221b9

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