Malicious PDF — malware analysis report

Static analysis result for SHA-256 77422faf2bdcd2b3…

MALICIOUS

PDF

85.7 KB Created: 2021-09-01 20:55:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0791b501ff6af4ac83343e3c608a3ec7 SHA-1: dadbddd81633e32b073d7bb5553e22eef803eabf SHA-256: 77422faf2bdcd2b358b964f12f440ff6d7014158ab86c44ee1f946a1631db23c
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://ketchas.ru/uplcv?utm_term=olympic+trap+shooting PDF link annotation
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/c3d9b4a8cb4e3a114dccf381a393257f/24222086066.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/092d638129da38ea1aa908cd765a5d8d/kironamugizopirogola.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/diwatilobigenasoves.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/lui6vkjbk8cp9pu22i9iouif43/melabagewomafiz.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/32497521072.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/fg1dud1lelog500006pf6pg4c5/28179839093.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/c75419ba7dc192ee9e4e768ce0f99c75/bulusujuwinivosipagama.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eff160afa15---47858639668.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/bidiguwigonudepoviz.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/susoxabopapurowaxalaj.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/76649582094.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/47423913658.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/36610629077.pdfIn PDF document text
    • https://coimbatorepressclub.com/FCKeditor/userfiles/file/gopuvajotakomex.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/nipobusuxoli.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/pagoropokadobikesex.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/novabizolonatujanido.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/42a67b03095837a3eb2619a18c1b6930/suwonofumitegim.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c7841ad3e---35154984178.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/zemixogawarelesan.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/3624b63dabe6b162a5e80642d69a7e1c/44867799537.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/bogexokezuxoxixevewaf.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/tufezivifeviz.pdfIn 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://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_off0000eb25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB25 10828 bytes
SHA-256: 61a46fdf716fd02e850823233d8e573193e83c2cf015a2ff646515e90dbd5a9a
font_01_sfnt_off000103fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C0E 17600 bytes
SHA-256: 09e4666b50e9781f8fe16044ad7e58ac1efae98dca48bfd0d4c4c18b0e639a7a

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