Malicious PDF — malware analysis report

Static analysis result for SHA-256 d10bf9fa89304c3b…

MALICIOUS

PDF

83.4 KB Created: 2021-09-02 17:05:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e1932c7a7dbc982a9e85b2ead008705a SHA-1: d114b64e2b0c6475e3f460aefb7a42df948e67c3 SHA-256: d10bf9fa89304c3bb4941ec7a11cf7f6aec842ec1cd2492ebaf3d0ee05015772
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely to distribute further payloads or conduct phishing. No scripts were extracted, but the PDF structure and URL patterns are consistent with common phishing and malware distribution techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zivotzaokny.eu/res/file/80939042922.pdf In PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df9c3172284---fugeluzijuwusiwokoxagebez.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/19815745934.pdfIn PDF document text
    • http://tw-jia.com/uploads/files/202108281943227261.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eec5ce9e10---dujaxeru.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/telofexuru.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/75974353931.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/dovegajarufotupotodolo.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/5893udup87repc3nls34lk9mig/23842061436.pdfIn PDF document text
    • http://www.smartlandgroup.com//ckfinder/userfiles/files/37226860840.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/bowujidatagukemidozik.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/22081145089.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/roxolefimobolesu.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/2027efdca21b06ee5c3234d194db67f9/fulosasuwavemoto.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160814f87aa4af---73842649314.pdfIn PDF document text
    • http://xn--elementy-zczne-kwb98g.pl/media/file/fudejuzis.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ee60917d5---diroxatexedune.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/poxoxuxe.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/gofuwamerabikarexisogewuj.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/zizimaritivajabex.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/11951998418.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/budaworini.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/sugigetexadoxu.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/ratolixesalozuzadif.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f6cbf45f0100e45768087ae71a9553e8/vanunib.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/q2norlrp561cau85dh5pah95id/20786136999.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=backyard+beekeeping+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_off0000e359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE359 10764 bytes
SHA-256: 714e599dfb7ad8ce8facae81974fa38d2990e19014ff21447df9dfda8e56878d
font_01_sfnt_off0000fbd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD7 16792 bytes
SHA-256: a2a40cb9cb38eb8b04f408dd5000577eb4446bca2ddeb3217d24ef7e86ac59c4
font_02_sfnt_off0001277c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1277C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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