Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9a49086a9a1eba6…

MALICIOUS

PDF

79.3 KB Created: 2021-09-21 12:04:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7152425875c9d8903409a1039cec9418 SHA-1: ed82c3511079f59fc8d11f48b5aa54b0d5939e4c SHA-256: b9a49086a9a1eba67321187b65edcd643c8fa10e29bef6195643dbdef3984961
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was flagged by a machine learning classifier and ClamAV as malicious. It exhibits characteristics of a phishing lure, specifically a fake CAPTCHA prompt designed to deceive users. The document also contains numerous links to external websites, some of which are hosted on compromised CMS platforms, suggesting an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://sunil.kr/uploadfile/fckeditor/file/ratutaxukasagewutomalisa.pdf In PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/99457930383.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/75956216703.pdfIn PDF document text
    • http://sooclose.eu/upload/File/letisujimufixosor.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/32660307028.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/zujejib.pdfIn PDF document text
    • http://gamecoast.by/uploads/files/24500458061.pdfIn PDF document text
    • http://leicesterbiketec.com/userfiles/file/16025371524.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/sebofoge.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/kexodifa.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-9-19/20210919124521408320.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161461d10bb0e7---80567682032.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/luliromatugulo.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/5968276350.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/161397dfb45617---49003580536.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161433f1fe8616---77812600330.pdfIn PDF document text
    • http://clevio.biz/fckUpload/file/58680483360.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/zufatedovunetutikafat.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/60618883185.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/15907829264.pdfIn PDF document text
    • http://flairpens.ru/uploads/file/98640765888.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/d597766e0ba3611a171f741ba9f01c1d/1164505844.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d70511c8b7---33814609379.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/27664666037.pdfIn PDF document text
    • https://servicepapik.ro/files/berosatoxexedu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=gst+sports+apkPDF 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_off0000d615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD615 16888 bytes
SHA-256: 2704095314165571d92ce1639ca8f8a20f2ed82f1d1a7f7a6e68213747f26080
font_01_sfnt_off00010192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10192 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A9 10004 bytes
SHA-256: 89d77a5aff204a2d97dc71e965cd7d7274da13a6b79be9a9f587f0a7450b0b75

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