Malicious PDF — malware analysis report

Static analysis result for SHA-256 d524d6b165fc7a72…

MALICIOUS

PDF

81.0 KB Created: 2021-09-05 22:04:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3d3f1fcc0b9321436cf2e50bab98be89 SHA-1: 014ae75e1c389a05c24d2215dee273b4d90678fe SHA-256: d524d6b165fc7a725636db5d7b72e168a969d71f08207239d9cb781cd9cb1d4c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack.

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://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160cc270ed5867---nisotixufewowatisisixi.pdf In PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608994b6426bb---voxinexubukodivikoruwevu.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/18801870938.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612b3506d014a---begagusudedogawapujezipi.pdfIn PDF document text
    • https://notarbrazda.cz/userfiles/file/In PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609041cb76944---zupigutenipadejafavig.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/i5ag1s77g05qptpruqefhrnhb5/dexurokafo.pdfIn PDF document text
    • http://xn--d1achljw0b.xn--p1ai/content/upload/rezurofewuvoj.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bb30a722234---95756924957.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/boxulo.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/58618588636.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/bf8f567bef928fd4c55ddc39298c6094/14428334496.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/wujuxisudupowenezuba.pdfIn PDF document text
    • https://stealthwindow.tw/uploads/files/202108170342441222.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/75701810077.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/vomolajiwalotogasodovipe.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee3d8d8913---3396072155.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/95730554618.pdfIn PDF document text
    • http://privateeducation.sg/verzsape/demo/upload/admin/files/volexizirikojezorar.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/78092418438.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/nalosogif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=taller+de+escritura+para+secundaria+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_off0000cfd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD6 10556 bytes
SHA-256: 7ab037e559af564f9ab3ce44b81a6b7a96ebe1f39aae1568638872a7d4e6e1ee
font_01_sfnt_off0000e7fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001000d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000D 21324 bytes
SHA-256: 9c523db667edb1ed1de28d221cd4fbc99007de3eaf065a88c96e97500cd4f54e

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