Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcbd1006e1c52aec…

MALICIOUS

PDF

71.1 KB Created: 2021-05-10 05:50:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 2c24b3bbfb88ede21161774e8172594c SHA-1: ad98d70548b9b8a7804b01147ec722a82fbf23a8 SHA-256: fcbd1006e1c52aec0d4fd54c9f0f96c3ed31da75223ef06569550bd9f0f7984a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially harmful external content, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://synerhu.ru/uplcv?utm_term=3rd+grade+common+core+math+practice+worksheets PDF link annotation
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2cbc20659---tizuzuwodesewovupe.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084093b0724e---kazotazufalife.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609845e74ed33---18228691463.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/bd29988e3050484a498f8453c2ee7eb6/84586269810.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee5f79d8aa---94960951332.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/9835356d3bda11a0a9dbdfcf860b61d4/zawujekedeporefu.pdfIn PDF document text
    • http://aquatrustfina.com/userfiles/file/jobuwa.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/15882818430.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/68pg8lepnbp5i6o4vvjchnfnr0/11112849626.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc17d29ee2---dewudodofofatonawor.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-4/20210504045822958286.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/41b0f05e1e600c019ef5c2d34a6e3dd8/ruvozaxoves.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/pqk4ebbama7f8mgaqb3etgabb6/63891500688.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744d1049080---guwaxazolexopovobi.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc0ad76caf---lobeluve.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/36rvsufd1uk1kb6b79cvl83h3v/fixut.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/6ead1d08e5d8d442384bdaaa15fe3f88/33977401446.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160923ca89b11d---6847512639.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD620 5680 bytes
SHA-256: c82b972f7f7180edabec60a5b22369d7f61e45332a25f5ef8cfa923f8424b393
font_01_sfnt_off0000e958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE958 10584 bytes
SHA-256: 25e22ab8614d72414880d34e76069829ec165baa9674daebdaa0016d1250ecce

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