Malicious PDF — malware analysis report

Static analysis result for SHA-256 289df2104de4fa9b…

MALICIOUS

PDF

67.6 KB Created: 2021-09-08 12:13:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: da7950de1fd2cb5e94ccaadf667d6a72 SHA-1: e89d17dc7e79b6d7e8dcd0951131d50096234009 SHA-256: 289df2104de4fa9b15ae5edce82e74454e00231f66d7f8e5e65647ff6d12d602
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains numerous embedded URLs, with several pointing to compromised CMS upload directories, suggesting an attempt to redirect users to malicious content or downloads. The document body is heavily obfuscated, preventing a clear understanding of its specific content, but the overall structure and URL findings strongly indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://dinskayarealty.ru/media/file/98134342490.pdf In PDF document text
    • http://yuanyoujie.vip/userfiles/file/bimogawididotigidu.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/61ef5c07ecb6f5b108971bc81b5ee00a/jamuxefuru.pdfIn PDF document text
    • https://seikai.jp/free_images/files/26175190103.pdfIn PDF document text
    • https://securitydm.com/slicice/file/zutisodazawuvef.pdfIn PDF document text
    • http://cuatudongnhatrang.com/uploads/files/lupusubejirinuxixadijisub.pdfIn PDF document text
    • http://arredamenticucinesiciliane.it/userfiles/files/9735096020.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/0454565f5206c3a53432c6a62125a5a3/wupej.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/nitofaxijarujenemudo.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/ee9621d9db0745e058c319a55105c4a3/63699481662.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834459c9dd7---57691597965.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/2cc0fdc28c5946fc5142d7ddc8d86fe4/jepowej.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/6745968841.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16091a113d49e1---45525411690.pdfIn PDF document text
    • http://biosystech.com/pdsFck/file/jefegakewubafan.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/ca07009cc9aa91490886286055271b89/78853286473.pdfIn PDF document text
    • http://murphysbeads.com/clients/54316/File/27844045520.pdfIn PDF document text
    • https://mfdesign.hu/files/file/58519767281.pdfIn PDF document text
    • http://www.buildingmalawi.com/images/uploaded/documents/tukelupolamexopobifejuxan.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160968aabb9913---61814971732.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd1a2ce72e---19335276878.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=rossmann+werbung+prospekt+pdfPDF 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_off0000acb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACB0 14204 bytes
SHA-256: 0b8c1c6744dcf9d9cd91a6e78d6dfaf758fb731d44d828186ae01bce0ba5ca25
font_01_sfnt_off0000cf6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF6F 11164 bytes
SHA-256: 06774f983811b09b0c9c38dcd0123a753f57a200a5b7f575975970c53071ce52
font_02_sfnt_off0000e93b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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