Malicious PDF — malware analysis report

Static analysis result for SHA-256 a652cbb712ee62fb…

MALICIOUS

PDF

82.2 KB Created: 2021-09-20 23:29:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: dba7336ab6bd8af25fb0d5a91f65a834 SHA-1: 1c83ebd9373c41dc46de380c73a64985d6972c22 SHA-256: a652cbb712ee62fb24cefed5f91a1d2c99e37d77b4aa3e8336778758e3a0dbb6
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The embedded URLs, such as http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139549aee74f---gimud.pdf, are likely intended to host further malicious content or facilitate phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://cofetariafraguta.ro/UserFiles/file/mabigokugo.pdf In PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/gepizemumevivuzosuxiluf.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/81865116639.pdfIn PDF document text
    • http://th-hl.com///upload/files/18035653603.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613b18e8616f3---bonisemuwu.pdfIn PDF document text
    • https://kujainspectors.com/candyticket/uploads/page_images/files/53702086440.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614509c62741f---nimolonereligimav.pdfIn PDF document text
    • https://sukhayurveda.in/userfiles/file/tunedebatokokifugenikonu.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1631936872.pdfIn PDF document text
    • http://studiomanzetti.it/userfiles/files/97458708952.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/90130922230.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/pesalifudaretezu.pdfIn PDF document text
    • https://geloracinta.com/contents/files/jedadalufaxafinepoliwu.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/wamojudiruzomaburosazogox.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139549aee74f---gimud.pdfIn PDF document text
    • http://zuche0551.com/upload/file/faxadelener.pdfIn PDF document text
    • https://xcheck.vn/uploads/userfiles/file/36917313142.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210917_2462E7BDE9B57446.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20210912062509_vvap90.pdfIn PDF document text
    • http://wksx.top/images/userfiles/file/48850537262.pdfIn PDF document text
    • http://aczelzalog.hu/tmp/35036996850.pdfIn PDF document text
    • http://maquinandoysubastando.com/dleyes/admin/fotos/file/63480394134.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/dewetog.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/4be909f1fdf477df1c75cdbd048904b4/71141529710.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/2021921544589535.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=google+pixel+5+antutu+benchmarkPDF 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_off0000d8aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BC 18496 bytes
SHA-256: 7020f081ec42819dd010c5298de8842b90d61e334170d4e72187fffb1b423def
font_02_sfnt_off0001211f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1211F 11260 bytes
SHA-256: 14ac51ef30c932d09e44c5cba2fffced3016405d61d90a40fcb0fe5de20298b7

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