Malicious PDF — malware analysis report

Static analysis result for SHA-256 41009a06855bb736…

MALICIOUS

PDF

81.7 KB Created: 2021-10-04 15:58:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 3bf46f83ed06f588b38ae0dbbff2a983 SHA-1: 4fd6761c472b9cda33064b9e240278db6bcee5d0 SHA-256: 41009a06855bb7362c9388a6eca9ff3249efa4cf6b7bfb04058cb3058051cccb
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. Analysis reveals it functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised WordPress upload directories. This suggests an attempt to lure users to malicious or compromised sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://debeleven.net/UserFiles/File/94489077409.pdf In PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/d41e9331249409aefc99f08209ba4a1b/77208809626.pdfIn PDF document text
    • http://onlinevay.com/upload/files/13245497888.pdfIn PDF document text
    • http://delfosventures.net/userfiles/files/6605456447.pdfIn PDF document text
    • http://modaxch.com/userfiles/files/gudubux.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/wujoka.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/mch3bhhbgok8sed0ka4grvrodh/37559784251.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/lowemazaxopawajolo.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613991308bb4f---medadavivew.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142e8635615e---rajexakakiwijusa.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614038a1ea1cc---43965515445.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/96663255420.pdfIn PDF document text
    • https://adrfarysz.pl/userfiles/file/16461908573.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/kixusariledosupamulekejab.pdfIn PDF document text
    • http://linza-market.ru/upload/files/35816384563.pdfIn PDF document text
    • http://anduong-nhatthanh.com/uploads/news_file/92783141347.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/24854308973.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614b81ee1c875---3590419595.pdfIn PDF document text
    • http://trubaopt.ru/content/file/wipuxomazunovupomeji.pdfIn PDF document text
    • http://hk-bbc.com/upload/file/viteguginanopuwusoko.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/penejoso.pdfIn PDF document text
    • https://pitbulllocksmith.com/nbloom/fckuploads/file/wejakisi.pdfIn PDF document text
    • https://shih-tzu.ro/files/file/537242554.pdfIn PDF document text
    • http://logicparcel.net/uploadsEditorfile/wafinoroxarudologumu.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/lowoxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=let+me+love+youPDF 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_off0000dc02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC02 18616 bytes
SHA-256: 95a9ed0c9c4386ff3d74a84cd4da076b70455d105fbc404f4cdd15771a1d5705
font_01_sfnt_off00010bad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C3 9880 bytes
SHA-256: fc41c421f799fc91d5a464ebf03f54f9cecde7eb8213f87934345d406b84e1ae