Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb8550c482aefe67…

MALICIOUS

PDF

83.2 KB Created: 2021-09-19 13:52:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 01137a562c7f4be020ed40c1d3db2b29 SHA-1: 90e58fefc2388ee53fed337db9af53b591362f87 SHA-256: fb8550c482aefe671d1d6938ec0d69c42bebaddc67ae130a41914a50103a285a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to other PDF files hosted on potentially compromised or disposable domains. This behavior is characteristic of a link farm used to obscure the true destination of malicious content, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://kaie.org/userfiles/file/20210912212635.pdf In PDF document text
    • http://xnkvinatimex.com/uploads/files/taboxozeguboti.pdfIn PDF document text
    • https://xpress2.eu/ckfinder/userfiles/files/95611451986.pdfIn PDF document text
    • http://youzedu.com/ckimages/files/20210903160141289651.pdfIn PDF document text
    • http://zhongyuemedia.com/filespath/files/20210901101032.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210905_213753.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/puxupa.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/65652196110.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/nuwawagubusuto.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/gajisobetaxa.pdfIn PDF document text
    • http://sanruou.com/app/webroot/uploads/files/44407766768.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/3ee62deca59df0957ab6df401b10d374/lirobix.pdfIn PDF document text
    • http://hotel-gerard-dalsace.com/upload/document/73513072301.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c11597dd9c---11226857988.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/jigexasudonijalinorumur.pdfIn PDF document text
    • http://zh-huaxun.com/uploadfiles/files/43927562811.pdfIn PDF document text
    • https://peisheng.org/uploads/ckfiles/files/613fcb0b065e0.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/rvj7n9kdebdd0f7qhsljhh88dp/13414989851.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/lorijovokegizogumujevu.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/93694991020.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/64356141359.pdfIn PDF document text
    • http://sparkpro.lv/content/file/56524691391.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/35676962154.pdfIn PDF document text
    • http://shturnev.com/files/foFKED/file/79062953498.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/52669051355.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=civics+words+that+start+with+kPDF 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_off0000dee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE0 10460 bytes
SHA-256: 14871b517b9193c6038ef583ab7586285f56a42788d648a49d8828cb19f70456
font_01_sfnt_off0000f6dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DC 18652 bytes
SHA-256: 270295e2358f1b3b1c7b7f08f783be379089b602eb90991645621397866096b6
font_02_sfnt_off000126b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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