Malicious PDF — malware analysis report

Static analysis result for SHA-256 eeb5a2ba5b15989e…

MALICIOUS

PDF

80.5 KB Created: 2021-08-16 21:01:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9857b7f50d39e6634ead768669d70857 SHA-1: 0cf7bbed3c2528ba509367afcee07363cfc89a2d SHA-256: eeb5a2ba5b15989edb842b18b18da79c6e8425aed0eeb16c73df549190cc30f6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://radio-aurea.eu/files/file/22045952933.pdf In PDF document text
    • https://smartcirclegroup.com/userfiles/file/penanop.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16115b1acba360---dugawebob.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/tosazewobajixejeruzikedo.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/37755638113.pdfIn PDF document text
    • https://efnnma.org/files/file/74160304023.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/56e53f7c2fd4e81cd1fb94a7808ee003/jumap.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/332b3700a351a4557b239a85cc115085/92223806151.pdfIn PDF document text
    • http://japan-railpass.info/images/blog//file/xisakenoxirosisovezokam.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/pvsv5p13nslls09me2muqo87hu/37182295169.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/78714452905.pdfIn PDF document text
    • http://medeeatour.ro/mm/file/43401687085.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/3842ad73455c80fc6bd307f1aa0ccd15/45643272982.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb1d4c0374---muroz.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/ecb6792a0e3072e5cf8a3a1edaec488a/juraxopa.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160830fdb66860---52964172772.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/barumakimapolejisakigupiw.pdfIn PDF document text
    • https://aduanaldelvalle.mx/userfiles/file/zorasora.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1609463bf6de7d---guberovonurigufizez.pdfIn PDF document text
    • http://canvangdientu.com/images/file/zosezupakeruv.pdfIn PDF document text
    • https://marosme.ro/hirek/file/basokadivuso.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/54943069873.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/70571330075.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/14684891806.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/bibipumotobatovugifu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=physics+20+kinematics+worksheetPDF 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_off0000d3c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C9 17008 bytes
SHA-256: 25bcdd9aab244881ff55e28fa9ffbb6f42780841b040b3b443d4bdcec4e69fb7
font_01_sfnt_off0001005b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005B 10984 bytes
SHA-256: 33699860c9d2c7292037df764387077af6ca2a053f485995aa24761c1ea147aa
font_02_sfnt_off000119db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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