Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4806c264dd08b7d…

MALICIOUS

PDF

82.1 KB Created: 2021-09-23 07:21:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a574988245173f6119e1c7ec410baade SHA-1: 5579826b04dfb86d1a80549c563672339a8a299d SHA-256: b4806c264dd08b7d3623232fe94bff0d3c926a98e691a9f07ca114e07c9e2179
156 Risk Score

Malware Insights

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

The file is a PDF containing numerous links to external websites, many of which are hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of a link farm suggests an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://laborke.ru/uplcv?utm_term=edward+tulane+book+pdf PDF link annotation
    • http://ambulanceservice.pl/userfiles/file/14998269053.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161390aec25e98---pokogebelijej.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/mipigexuta.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/sewavefasepunusigovusoro.pdfIn PDF document text
    • https://krzczonowice.pl/gfx/file/popolodo.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/09/03/949962994.pdfIn PDF document text
    • https://kolorubursztynu.kolorubursztynu.pl/web/uploads/files/kirod.pdfIn PDF document text
    • http://snsi.jp/image/news_file/sazimovo.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16131db0947f87---46243147153.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/wabutodepobuzusujipenukom.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140ae986ee42---zugoj.pdfIn PDF document text
    • http://prtourusa.com/FileData/ckfinder/files/20210903_27990E9F28CE83B8.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1613340a4c9f78---newis.pdfIn PDF document text
    • http://xn--aknmedical-yub.com/uploads/file/27663258656.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/54762389955.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/jixodemusokezexida.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613399e4f1143---weriwev.pdfIn PDF document text
    • https://redac.ch/upload/mosemoz.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/5907298e09e23176fd96ee85e2089009/gukimareboxomoge.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/68974736790.pdfIn PDF document text
    • http://hig-hegmann.de/userfiles/file/11460108522.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/5ef8470ad66ccd1d891d93d6e0885c67/81356951298.pdfIn PDF document text
    • https://obrbikes.com/files/files/gijegadaxazisamibi.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_off0000de84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE84 17116 bytes
SHA-256: 462566654bfc6e83a2427b212db1684cb7c7bafd1dcceba2222bea4909fc9683
font_01_sfnt_off00010aa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA8 10632 bytes
SHA-256: 589ac4b4653ce4926abbf51b89c326d669eb50633f2340ff376d4e85f23aa705
font_02_sfnt_off000122ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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