Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e528b28eb73a86b…

MALICIOUS

PDF

124.1 KB Created: 2021-06-09 19:08:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 9e7c8d38d50996b35cad242974f6c91e SHA-1: 913509b9ce85ccfad7857bff0c07082355774fcb SHA-256: 9e528b28eb73a86bc716c7c3e4e74543ccc03c454303505b2489433365520901
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 0.9996

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://oniceh.ru/uplcv?utm_term=mirrors+justin+timberlake+music+video+meaning PDF link annotation
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/9c741a69b06f698c2490ed75df610867/82012895823.pdfIn PDF document text
    • http://washchienluoc.com/upload/file/86487264766.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/8fd7d149295b6796519e6e3c52f0f665/bikalomip.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/ruzexujitaw.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/229002b22b67d5c7176318f438df32d7/6190722345.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a2abb190167---15107417172.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/a97d837b3308ab62f4c98e801f9ebcde/xitenupokudirovisi.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/kiwuperafaruwikuse.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/95q5vr54fsj7sq7vtc441q1k6n/69352415227.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/nujivazemifiligejok.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/64384819136.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c02b62591f6---galumadogasepevuloxedu.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/gubogebaxomijejufoz.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/39bb8031635938537e52bd14a4b069e5/466096875.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16094986108e01---xogonukasalozelumogoj.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088681319861---92052903126.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b02e7b75648---16091208641.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17675 6496 bytes
SHA-256: c521828ea1f4dc3208837a13cd3f55dc8466f0bd149592923eb98de63e8a33c6
font_01_sfnt_off00018cb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18CB9 5604 bytes
SHA-256: a273d3efbb6a7cb003d9625e3f2bee11aea4b15421b12c76b80acbba8883d725
font_02_sfnt_off00019fc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19FC4 13924 bytes
SHA-256: c7e4a12cdeacbd9cd04165331542de6fe82739161da5a8103f0610dce054e223
font_03_sfnt_off0001cb42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CB42 16120 bytes
SHA-256: 15a68420f1c377824b8c1fd571ac7c30556db1b4bc05006bf44ec3f6c6c83208

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