Malicious PDF — malware analysis report

Static analysis result for SHA-256 b483efd951a5352c…

MALICIOUS

PDF

93.5 KB Created: 2021-08-10 13:43:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 204bfc95685d0b714d1819d930e9696d SHA-1: 2f2965a595c78c0f515fc60caefbf242008401eb SHA-256: b483efd951a5352cdc5771332b1495b9577a37ea18b88f6d2a9f98838591bdf6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://ibeguiristain.com/userfiles/files/94174847538.pdf In PDF document text
    • http://cmuniontravel.com/userfiles/file/tevobotusajukoj.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607e406a7af4a---makukevemezakaxujawaxuzi.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/8748463055.pdfIn PDF document text
    • https://zenkenmoshi.info/images/files/file/buzovedev.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/24737667163.pdfIn PDF document text
    • http://hopkinshigh1988.com/clients/75739/File/lopiremewaputusop.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/86071332207.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/45344034501.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/su552mfr7fr80sf4thdh3ugpkf/nojone.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/24016309366.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/2f454f7fc2d01be6ba1a0093a3608664/17180008927.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/9989f10317a6abee3255d1c811e5b125/naluzudovuwusuwabosugojix.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1ed6f8d28e---zijanedoli.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089b6b9e2850---vusegiravu.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/f7a58f5dd14cf2277214aa1faf9dacfd/10609958271.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/85862485963.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/cf4e78ab8217ca1244238e92e518ad16/monisezimusizazarumin.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021072500301673499.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/46991213002.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/45634756344.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/24323922192.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/terivenuxopig.pdfIn PDF document text
    • http://homeopathyhk.com/files/wupuferinupoki.pdfIn PDF document text
    • http://olympusflights.com/files/files/ruvunisolenorevenavamumi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=what+is+a+cocoyam+used+forPDF 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_off000108a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A0 10796 bytes
SHA-256: 72a19e95807dd3ceeaf78062395a231c6a54f6b298fdcef22a75a274c94ed2a7
font_01_sfnt_off00012192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12192 17548 bytes
SHA-256: ff605685afc7b2ca53cf7438c450275924fdc96fd53f9691106fc9fcce055050
font_02_sfnt_off00014fb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1