Malicious PDF — malware analysis report

Static analysis result for SHA-256 c140ce06c2bbf710…

MALICIOUS

PDF

70.1 KB Created: 2021-09-25 08:09:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 452ba54b59e9f90d1e98e0b22c15c49f SHA-1: fafba7942e44ce4beb15b8367ae844e9a5667f6b SHA-256: c140ce06c2bbf710129469c5fe149524458cf37c38581ee8a2d01d3ecd0b76bd
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload storage and disposable hosting. The primary purpose appears to be directing users to external sites, potentially for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://allytemp.ru/uplcv?utm_term=wonder+woman+1984+watch+online+free+full+movie PDF link annotation
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1614b07b70eca0---suraliwegalimelozawemoge.pdfIn PDF document text
    • https://ofly.om-digitalsolutions.cn/upload/files/24843472659.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/pobobutowawanezurujarib.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/mejutatujusilawafuz.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/90728415030.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614a44068009c---96250099706.pdfIn PDF document text
    • https://plasy.com/uploads/file/bejanujononudavot.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/lelawiroratumo.pdfIn PDF document text
    • http://hacoauto.vn/upload/files/29330941881.pdfIn PDF document text
    • http://zae.me/datafiles/file/83531233439.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/wosixumuxome.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/42722325796.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/tusagowevisavojefudezis.pdfIn PDF document text
    • http://aristosaigonhotel.com/uploads/files/kugibeduwizawuwopidoputab.pdfIn PDF document text
    • https://maintogelonline.bet/contents/files/fumaxafesorufumupu.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/zupowazamaforavowenozex.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lobolenofovufiwomaj.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/iesf2gfcnhj3rrfk0i88r066n5/kumezumituli.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/92441967535.pdfIn PDF document text
    • http://isleford.com/filespath/files/20210904200003.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210909_2E0DFD684ECBEB13.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/2372313604.pdfIn PDF document text
    • http://locke-3c.tw/uploads/files/202109160256014645.pdfIn PDF document text
    • https://anbc31.iscriptscloud.com/app/webroot/files/file/40962395991.pdfIn PDF document text
    • 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_off0000b2cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cadd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCADD 14700 bytes
SHA-256: 854ebb3d4a2ceecb880618e7b6892ef7843fd8f6acd25ff6355800cb53da2825
font_02_sfnt_off0000efa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA0 11324 bytes
SHA-256: 900aa0bac615b9e43dd971833981f819e0415818041da21367c15eb3f9d6f060

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