Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c5e9d02bc5c4c46…

MALICIOUS

PDF

69.3 KB Created: 2021-09-19 11:14:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c56b806ee9c4bb06dafb27b2195036d2 SHA-1: 33f88cf409c4f8b0c8eb18793aa05d53efee1024 SHA-256: 9c5e9d02bc5c4c46bcd4cd96ef36ca1ad4fe7ad1d7ebdeb2b8d0fef04e3ebde2
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to multiple potentially compromised CMS upload directories and disposable hosting, suggesting a phishing or malware distribution attempt. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://arenabilardo.com/data/_files/42838848964.pdf In PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021091410045073499.pdfIn PDF document text
    • https://textosolutionslinguistiques.com/upload/editor/file/34411258420.pdfIn PDF document text
    • http://noithatachau.vn/webroot/img/files/kikadepoboleton.pdfIn PDF document text
    • http://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/1039416121.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c480109248---72044443724.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614577b3c506e---duzegesekekur.pdfIn PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/nerutef.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/gerodu.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/gubomugeligabenuj.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161322d6b66885---54813154758.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/tuzig.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/lusajuperu.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xemotejesix.pdfIn PDF document text
    • https://bulendengin.com/upload/ckfinder/files/90136288845.pdfIn PDF document text
    • https://impactmediaresources.com/userfiles/file/fotusiwosafiko.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/34db1ee97b697d74729590db1ea716b9/56171110785.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/juwoxagebifofuje.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/14351808720.pdfIn PDF document text
    • https://almudenafernandez.co/ckfinder/userfiles/Files/nolodobogu.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210911202500.pdfIn PDF document text
    • https://incense888.com/uploads/files/202109010611304639.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/89491080836.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/jezadogawebegowemaxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=where+to+find+download+folder+on+androidPDF 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_off0000b435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB435 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC47 14180 bytes
SHA-256: 213ddcf5d758437ab8f54a47b3b8b8ce6aba6075ca5b73b39d955ee995bd7a9b
font_02_sfnt_off0000efa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA2 10360 bytes
SHA-256: df28d1145cb5dde01b7eefa711617a9fa4bc5d03cb19a741098d3ee78c908482