Malicious PDF — malware analysis report

Static analysis result for SHA-256 e147278e63e92582…

MALICIOUS

PDF

88.3 KB Created: 2021-10-07 17:43:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: da68fa0b3d78ecd963ec30aba142239c SHA-1: 4e41468d809485112f23e792dc4f968c79018f3f SHA-256: e147278e63e92582778457d7c3f552b2f50807384d5eb5706cc4b8794e465efb
196 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories and disposable domains, suggesting a phishing or malware distribution lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to trick users into downloading a secondary payload. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16150bb549601e---34916052692.pdf In PDF document text
    • https://www.luxboss.com/ckfinder/userfiles/files/vekanalararosenisu.pdfIn PDF document text
    • http://banquat.com/userfiles/files/71183986735.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210929043142.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/koxetemuravewugipufa.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/2e3c644e43b3e959d50f897a8f4689ad/venim.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/nozuvu.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/65201468361.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/69917651078.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/98303344328.pdfIn PDF document text
    • http://cx-gl.hu/images/files/simotop.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/89059629056.pdfIn PDF document text
    • http://bscartridge.com/pic/gagemilurowaramitujanotev.pdfIn PDF document text
    • https://vhcvietnam.vn/ckeditor/images/files/pekijijuzoxixuw.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/89667560218.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/mixepopixapaxu.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/wetoxejal.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/0b6101b2fa8f62e4d248defb50b8b34e/zezodugi.pdfIn PDF document text
    • http://cabini.it/userfiles/files/lefuziwujekizig.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/segamapunexas.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/98720643389.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1615e3782aecd9---juwetaf.pdfIn PDF document text
    • http://bhartiyambeohari.in/userfiles/file/pizirafowodatepigunonipi.pdfIn PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/58855656806.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/woxajasixinetogutuji.pdfIn PDF document text
    • http://administratieindex.nl/images/uploads/xexewujiseke.pdfIn PDF document text
    • https://tierlistei.ch/downloads/repisenuli.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/98592066483.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=state+the+limitations+of+dobereiner%27s+law+of+triadsPDF 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_off0000ec55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001046c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046C 10952 bytes
SHA-256: 2205a3cd22463c1d4ac24f11c4a366d5b3f326d107bfb4131e84c1c13a89c749
font_02_sfnt_off00011da8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA8 21040 bytes
SHA-256: c763d7e24b3f59c2a15486e19b05c9fd6bfc0d1adfed34f5b71fea8f2d8ce964

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