Malicious PDF — malware analysis report

Static analysis result for SHA-256 dac127253e6bd602…

MALICIOUS

PDF

77.2 KB Created: 2021-09-05 19:59:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4720d3498fc5d6fa42ccdbf1b2c3d323 SHA-1: e8612a128b4e1aa2e48ba77f30e577c01b0e48bc SHA-256: dac127253e6bd602b942d2b029133dcac49ff8d5691f776c5a74397e17926503
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which appear to be disposable or compromised hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or SEO spam. The presence of multiple external URIs and link farm heuristics supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/74937109072.pdf In PDF document text
    • http://gaia-onlus.org/userfiles/file/37085456276.pdfIn PDF document text
    • http://lynhuagiasi.com/Images_upload/files/27976248205.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/77186099351.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/6772467522.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/28020763801.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/mepedoxebave.pdfIn PDF document text
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/70573971204.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021062323490526.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/57110058056.pdfIn PDF document text
    • http://delshadian.com/public/userfiles/file/89250325056.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/lutuxezovumumewubid.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0dbe41cce2---livimigagusidexikezokedu.pdfIn PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/nawepatuxuzaz.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/e41a2a70f390b7f994811e083abf1dd3/xekevevenuponus.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/82494192470.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/jokororup.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c658d08086---mavotejaso.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/a5f8d24e5dd4db8b653c21da0aca572c/31905948112.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d957ed8d2---bagosufoj.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/63377487023.pdfIn PDF document text
    • http://modero.vn/upload/files/dagizatisawonekafebudu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=copeland+semi+hermetic+compressor+manualPDF 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_off0000c6b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6B3 10912 bytes
SHA-256: 77f960f399257bff487c7a938bea9d5fb08fc9dd156bbca16c00258926964888
font_01_sfnt_off0000dfba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBA 18280 bytes
SHA-256: 86b321c11dd845c60e122cd0a8541c9396c7adbf8daa9c295db71a2f1fd75747
font_02_sfnt_off00010f38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1