Malicious PDF — malware analysis report

Static analysis result for SHA-256 c86664ed8b6326a2…

MALICIOUS

PDF

128.8 KB Created: 2021-09-04 13:24:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cb926334412860bae1dc36b7df76e0bd SHA-1: 65d6f5fc59d417b17b14c80519de35bd34b6dc86 SHA-256: c86664ed8b6326a2ef1644462c609cd244375764cf60e69efa4200faf4495d7c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which point to compromised WordPress sites and disposable hosting, indicating a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or phishing pages. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a malicious document, potentially leveraging embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://abofahed.com/userfiles/file/77747543069.pdf In PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/38fba91b402a96e485a9d1149f55ad86/jekuxakovepesevi.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/fudadol.pdfIn PDF document text
    • https://le27.fr/docs/file/wexajunu.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8bb4a0261e---jojeminibenajo.pdfIn PDF document text
    • https://rowanmkt.com/Uploads/ckfinder/userfiles/files/regatabobesefa.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608146c5c12e3---50827628043.pdfIn PDF document text
    • https://tennis-samara.ru/img/file/26776202968.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee224027a1---76377828267.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/30635461412.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0fa47408e---gapokavof.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/25227454380.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/0ii2s12pjsamrf7uhgh5uarcr3/75053236337.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737f0d6dfbd---3723635989.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/16671983159.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/22898094624.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/vizisererakixijebuwoji.pdfIn PDF document text
    • https://ville-saintleonard.fr/pdf/50174236150.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607536f3329cc---44626724298.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/durojogorozomebixiz.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b89cb216d49---zesiduwakiwegujokeb.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160cc5b22db9af---41726726403.pdfIn PDF document text
    • https://broodjedenbosch.nl/ckfinder/userfiles/files/45588488934.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=kelsen+theory+of+law+pdfPDF 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_off00019278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19278 19448 bytes
SHA-256: fa554e6a27353c3ef2b98db592de859ddd5a08c0a7ed5462b0b422971d84c3a0
font_01_sfnt_off0001c43b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C43B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001dc52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DC52 10692 bytes
SHA-256: 8d5f980db67901757be7b07125d5d7f80f733cfe1de53073bc9dde869c46eb14

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