Malicious PDF — malware analysis report

Static analysis result for SHA-256 7386dccc1a62099e…

MALICIOUS

PDF

74.7 KB Created: 2021-09-04 00:46:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 53c11c462002a6d5b1f0a834ae8c83e9 SHA-1: d4be7b3478b0d8d363b4b3010c6bf05a2dd3667d SHA-256: 7386dccc1a62099e4f9431a3df726e3e522322ebfda662f4e4ec6ee73bf41985
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to distribute malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://parokisantolukas.org/Uploads/userfiles/files/wotoxitidegexam.pdf In PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092556660c1b---66940881298.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/noxinipiromu.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/51623896247.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610fc6dff1291---xuwuxikaf.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/58220539080.pdfIn PDF document text
    • https://wsbtitan.com/images/file/mufesigi.pdfIn PDF document text
    • http://fatfailogistics.com/fckeditor/files/file/ledasifubebulanedadosobov.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc45b06ef6---41487669695.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb89c48bae---11480016457.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-8/file/nodixelijizurileb.pdfIn PDF document text
    • https://lecourbe.dk/userfiles/file/9047084922.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f18005b31c8---zajelebomakewo.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/sjf505jinjicdluaiulcf7r5h3/21101515631.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f49e4c14eb---66618217562.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/83205736975.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/91691092547.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/padumeziti.pdfIn PDF document text
    • http://veronikavilla.hu/userfiles/file/govewisozorinomizevoro.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/c7b0711353357e39385eecf0b93d89da/86424379027.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160afc4fb59755---zavapabatinu.pdfIn PDF document text
    • http://hydrem.ru/images/file/zekawewotox.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/b4bajt5odnui5gcq1p222dnmf5/22282067507.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/bc82d72fed344646f52b147a4650134b/daligap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=smells+like+teen+spirit+guitar+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_off0000bfa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFA6 16996 bytes
SHA-256: 72ad01be26cbf8c39f671f84dd4f1a0fb0daa26e27fa81f4363dd7c993cc3f09
font_01_sfnt_off0000eb82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB82 10988 bytes
SHA-256: e7a122a888b8bc3547e6fc6e0e1d34e9c0de9ff9db66ef1399df6ce144ef0f08
font_02_sfnt_off000104c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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