Malicious PDF — malware analysis report

Static analysis result for SHA-256 9feb39e6ed651a02…

MALICIOUS

PDF

83.3 KB Created: 2021-08-21 05:02:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f7cc13438abb2e0f821bb9f17ee4fa5a SHA-1: 9a4ee07ad5b8d911eef71e97a481901dad74807b SHA-256: 9feb39e6ed651a02376d6a2754ae44363c050f75ddd2c6a2b8260f0eb777bb52
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm. These links likely lead to phishing pages or further malware distribution, aiming to trick users into visiting potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://cructi.ru/uplcv?utm_term=how+to+connect+bluetooth+to+jvc+car+stereo+kd-r321 PDF link annotation
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16086af4a9b2c9---70612844461.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d567f1a5097---noforitevejidojowo.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/8d2d3c4085846b116e3924e2faceaf30/48872982754.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5cc1e0b8ef---ritekigakamuzire.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/74600446288.pdfIn PDF document text
    • https://5a.ro/ckfinder/userfiles/files/83303352559.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/paxazinatok.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160839e153d47d---71863247485.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a7bf285097c---89459469379.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a065b807d3f---27911329109.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/56578720090.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/vumuj.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/56914906103.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e77fc102dc---54700625544.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/ik3ltntcdi4r4sol0e5913f5nu/lelupidigarube.pdfIn PDF document text
    • http://mopron.ru/upload/files/60513385207.pdfIn PDF document text
    • http://gaongonmaiphuong.vn/webroot/img/files/81397350878.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/kirerawibemujedi.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/ranon.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/kamuzenolam.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160e4a63c568e9---69428259358.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/626577387.pdfIn PDF document text
    • http://coffee33.ru/archive/file/46454409962.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_off0000dff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF2 16188 bytes
SHA-256: 19a9d742871ef0852f0d0ee8c1b59ecf5e77ff12000f58b252223e0d42c7436b
font_01_sfnt_off000109b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D0 11360 bytes
SHA-256: e33bc3b5c9a96542f047ea3ab9b456fe2c5b6643e0ca77b807887415d2ce8523

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