Malicious PDF — malware analysis report

Static analysis result for SHA-256 f50928df195f7ad7…

MALICIOUS

PDF

81.4 KB Created: 2021-09-15 17:29:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 14f87df279cb71b6e5ad94fe7d3fa376 SHA-1: f1e2774a9d389ba3565292cdcf351215de8c62db SHA-256: f50928df195f7ad7f755c1250cb54ebbb330133b9fddd12a6f06e66946a82c7b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or appear to be part of a link farm designed to obscure the true destination. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a deliberate attempt to distribute malicious content or phish users.

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
  • 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://kangmeideyiliao.com/uploadfile/file///2021090507513754.pdf In PDF document text
    • http://doktor-okonski.pl/uploadimg/file/38906143160.pdfIn PDF document text
    • http://aminotp.com/upload/files/82563637539.pdfIn PDF document text
    • https://profm.hu/files/file/46138266387.pdfIn PDF document text
    • https://maria-galland.ru/files/file/66157085407.pdfIn PDF document text
    • https://globalcircle.club/userfiles/file/53608960588.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/zizutevazerolezopedof.pdfIn PDF document text
    • http://www.ocptecnology.com/admin/uploaded/fck/file/9128425560.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/kobikikeragemugojizazoji.pdfIn PDF document text
    • http://brandorbit.in/userfiles/file/benexo.pdfIn PDF document text
    • http://hanyangsteel.com/files/fckeditor/file/2113034342613f6af97c7e3.pdfIn PDF document text
    • http://inannamsao.com/uploads/files/70312548687.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/mipojavi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e2e549308---41092580884.pdfIn PDF document text
    • http://queenart.kr/userData/board/file/98458365576.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a5afaf8bf---73036701974.pdfIn PDF document text
    • http://ets-sptk.ru/pic/file/46502018961.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/oobm7pgkjt02cjph9bdtghp2t4/rodefu.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/2021912411452707.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/b5607e9b93e023b223982e6b9c42feef/24131146356.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/jisetibazimegowudileraf.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/55681635632.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/53350797005.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346ae22876f---58315988770.pdfIn PDF document text
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/89903716109.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=vidmate+app+hackPDF 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_off0000db94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB94 10300 bytes
SHA-256: 660d3444c4496d3e47d8afb8511a62c5e2d998ba2d4cf385d186caca26f2c420
font_01_sfnt_off0000f2cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADE 17448 bytes
SHA-256: 8fad4e22234cb8def781a9efa8a56483b8a19e94ffcb2ea8008e8073545bfc5f

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