Malicious PDF — malware analysis report

Static analysis result for SHA-256 30f4376e921a1123…

MALICIOUS

PDF

79.3 KB Created: 2021-09-05 07:05:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ffc85f89f6d6341612b251c076cfcaa1 SHA-1: d642d957dc82d0a3bcf6f84f5d750f1e76cbdecc SHA-256: 30f4376e921a1123bf9912d80d9393309831c80b6aa72f19d1f275c628181b74
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised websites hosted on disposable domains. The presence of embedded URLs and the nature of the heuristics suggest an attempt to trick users into visiting malicious sites, likely for credential harvesting or further malware delivery.

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://medvor.ru/uplcv?utm_term=difference+between+data+and+information+pdf PDF link annotation
    • http://hanasushi6.com/uploads/files/maxuramepufefuwelubedomu.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/839c3da1589ccd5a889a33c57917987c/fumoxadajibodelal.pdfIn PDF document text
    • http://willbramephotography.com/13884305755.pdfIn PDF document text
    • https://beaszemin.com/files/28398254709.pdfIn PDF document text
    • http://diclenakliyat.com/userfiles/file/waxeba.pdfIn PDF document text
    • http://vangphutai.com/images/uploads/files/jogabumiwa.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/161101a960f534---7751783165.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/40064664899.pdfIn PDF document text
    • http://travelspace.pl/userfiles/file/terodobiz.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/60945613537.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a41a7c15831---43952167173.pdfIn PDF document text
    • https://ccichn.vn/data/upload/file/40259945658.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092754ba980d---kekajonuwubil.pdfIn PDF document text
    • https://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/niponitakunonako.pdfIn PDF document text
    • http://ongnuocdenhat.com/upload/files/jiwokanu.pdfIn PDF document text
    • http://keralatravelpath.com/uploads/file/mabagi.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/724d30693e9cb94dd9f145fc2e33c4bf/refopima.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9c9907fba---gadatawunojetal.pdfIn PDF document text
    • https://speak82.com/_UploadFile/Images/file/vanovukagogemetup.pdfIn PDF document text
    • http://irinabailey.com/upload/files/46163730521.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab42b971e4---73844717397.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160815d3074950---kabozeroxotasesuw.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD98 18828 bytes
SHA-256: 1b3d8fa4152bee752994e1f3a4eb8c0f531f1a7b4896168e224d3b02e70d6250
font_01_sfnt_off0000fe48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001165f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1165F 10792 bytes
SHA-256: 079343bf234c6d2c9a86694d2c8bd84ca6129f4ad38f438a23b1e3d59d7f2aa5

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