Malicious PDF — malware analysis report

Static analysis result for SHA-256 139838b8c2d7da5b…

MALICIOUS

PDF

84.5 KB Created: 2021-09-04 10:55:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7d8c64ddc375616ee5f4df5ac4cea979 SHA-1: cf53ec48d15091bce0d7766cfea24b9846f2bb9a SHA-256: 139838b8c2d7da5b22c1de8935d5d7528f79242ebf38e4fc0e63817079798c06
156 Risk Score

Malware Insights

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

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs pointing to various websites, many of which appear to be compromised WordPress installations or disposable hosting. These links are likely intended to lead users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://smidgel.ru/uplcv?utm_term=hypertensive+emergency+treatment+guidelines+pdf PDF link annotation
    • http://catherine-massage.com/ckfinder/userfiles/files/17873033258.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/49554737824.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7d96e9ede820cd7067ace7dd1d713387/51917807998.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f87d8ded27b---40223559740.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607df33238bab---sojiteregagibalote.pdfIn PDF document text
    • http://razzledazzleevents.in/userfiles/file/setixol.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f7825e25eb8---70939331436.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/93086314746.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/a8639236f98fbcdafacaa72d52441c3c/91824487160.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/i9f38pmgucpra8163m0eh7mt80/jilipap.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/ujjt8thka3cp0qoiegmdk8pr63/gavulisupewilevirexidor.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a752f3ba5bc---basubitawotufubiwivesot.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090a3cb24a8d---86884727185.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210707/file/83343221759.pdfIn PDF document text
    • http://www.beautyvogue.ch/Files/file/84192360501.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/wonubupejawagigebak.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a769164636e---poniwiruxutu.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/konileberipomofegexisu.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/1efcf6586b8120f4dae6662aaa5537d7/xufaketusinif.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607522ec146df---82674162466.pdfIn PDF document text
    • http://baovevietnam-vnss.com/upload/file/79916076717.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/89878686039.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_off0000e4f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F4 17632 bytes
SHA-256: 0d66d8507c8a8f8ee3c15669454310713a4d10ec4484c134ecd7afa1aee2fa9b
font_01_sfnt_off0001125c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1125C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A73 11116 bytes
SHA-256: 95dc1006201c7488b438556753ed043923432cb8d57255498e321c13b215db60

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