Malicious PDF — malware analysis report

Static analysis result for SHA-256 b21b9d8754cbbad1…

MALICIOUS

PDF

86.4 KB Created: 2021-07-04 13:52:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: a888fa0b5e6ce5a086e43e75971fc98e SHA-1: 6b13f5bc0f1153aae1a404a5a4e26b7916605f5f SHA-256: b21b9d8754cbbad13d88758e6e29c7d69efbf40f2321e9cf3728a6faa26a354b
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, suggesting a link farm designed to redirect users. The primary purpose appears to be directing users to potentially malicious external sites, consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • 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.
  • 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 http://karat-dobremiasto.pl/userfiles/file/22907357454.pdf In PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/69dd51ce789eede2fdfe8940a36ce529/25685507316.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/903c4550187e9417720224c879e1f892/ketamezuwapemixewezimuk.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/16755950163.pdfIn PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/duxabemimavokadokulewak.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f2f403068---xamagodomojigutema.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/fc0c032538b9ff1ed8264e32ce640e60/matibeboxizazumaxevigoxi.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/74381986883.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608e99ecc5fda---8008317508.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b750badfc---talugedafetowituxeruzig.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f36e0c6ee6---lanuwopexibidafi.pdfIn PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/26110811063.pdfIn PDF document text
    • http://1-cx.com/ckfinder/userfiles/files/purugole.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/c0a9510f259458df15b63b2d94bf9484/21240268433.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/31501324299.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160816d0a9fc51---rabogatipazodek.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/q73h2ohqjc0uuhubtdv72v5c42/74963881439.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/gufikaj.pdfIn PDF document text
    • https://childconcern.in/trila/userfiles/file/57171304322.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/78353d628b0ead0225831c8d23c8b44f/tofov.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c51fceab9---57760283554.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/firewen.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/d316c77add91d736f80da86c9f36cae2/wojob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+cook+smoked+turkey+legs+in+the+ovenPDF 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_off0000ee63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE63 11104 bytes
SHA-256: 89770266de1601f393ce697ac56b9ee874cc8e33c24602dff04f6313cfccd6ac
font_01_sfnt_off000107de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF0 17168 bytes
SHA-256: e03f5855fbd68859d77309b4fc06a7bbe39cb88d0e5326fd538b0c0c9889d9f7

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