Malicious PDF — malware analysis report

Static analysis result for SHA-256 d598d3ebda6a7a64…

MALICIOUS

PDF

72.6 KB Created: 2021-08-29 11:18:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3456a69b55c4eb8cf5c2ef7e203b4d75 SHA-1: b40815d311bc4df0fe4254daeb78b72a0117e7ab SHA-256: d598d3ebda6a7a642d048bb272e764b800656155f7947da95f666ebc6067b1dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics as a link farm pointing to compromised WordPress uploads and disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The embedded URLs likely lead to further malicious content or phishing pages, aiming to exploit users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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 http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105afda2c39d---wejululixarisokurerabir.pdf In PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/90e89f61d6650944e3d79d3b766cac88/jexivipedexelixuxa.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/48983568220.pdfIn PDF document text
    • https://www.cascatai.com.br/ckfinder/userfiles/files/45484387268.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/kowimevirewawukag.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/99699349377.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b27ee2cfe9c---89149889019.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210621215651005.pdfIn PDF document text
    • http://debten.net/UserFiles/File/salesu.pdfIn PDF document text
    • http://lamgi.pl/ckfinder/userfiles/files/57639240992.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb321978b84---vokalaropolurekibinutera.pdfIn PDF document text
    • http://happy-travel089.com/CKEdit/upload/files/lukutaxadowapanepen.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/70317309734.pdfIn PDF document text
    • http://mayjack.com/upload/files/67605733233.pdfIn PDF document text
    • http://italiancousins.net/clients/5/54/54f3d33123424807706abe9154268524/File/1563571049.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/93436354203.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf5ca038594---568963587.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086bbf5258bb---41159169946.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a30936c0bec---pamikov.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/sekujesukakiguniranogexop.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/82942636325.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/kagenowazu.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f00ae9598ba---27071742186.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/2193603519.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b0881b9a54---31938892016.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160891004867c0---73487680610.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=iphone+message+notificationPDF 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_off0000bc25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD437 15676 bytes
SHA-256: fcd432293f57342f329a04e366eb7f7c77fbe2f10893828e483ea4409d22a055
font_02_sfnt_off0000fbb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB9 10732 bytes
SHA-256: cfde0f9a6b3f8330654ea746ef5739b98d4fa65523abba8872320f733853332b

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