Malicious PDF — malware analysis report

Static analysis result for SHA-256 15217cc74a0d2362…

MALICIOUS

PDF

81.8 KB Created: 2021-09-17 21:30:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1fd102cd360e0341145b6d3684078c38 SHA-1: 1325baa75fb66f8b13bba84a6d691ad80ef2817b SHA-256: 15217cc74a0d23625643e812858bc9a6dcee1153c43ab3394d87e33dee5ae847
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV and an ML classifier as malicious. It contains an embedded JavaScript stream and numerous external URIs, many of which point to disposable hosting or compromised CMS upload storage, indicating a link farm designed to distribute malicious content. The presence of JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://lodoshosting.com/calisma2/files/uploads/34077154051.pdf In PDF document text
    • http://sfalojistik.com/userfiles/file/52415951299.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/161317ebda7a81---43003556242.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/ronupametaliso.pdfIn PDF document text
    • http://omni-links-europe.com/images/blog/file/65538146105.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/vixibusujuzuloxu.pdfIn PDF document text
    • http://eichler-kammerer.de/fomovanaxakuzotukaxubo.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/38927084337.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/mivisugu.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/56590139684.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210903200024.pdfIn PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/rewuvupijavejozadi.pdfIn PDF document text
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/jowikunepipoxotopanijeder.pdfIn PDF document text
    • http://ameshamagazine.com/js/upload/files/kixonilug.pdfIn PDF document text
    • http://www.painters-restaurant.com/userfiles/file/26533549937.pdfIn PDF document text
    • https://arabadvertise.com/userfiles/files/didulijuxidejosavolulit.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/xopumomimubivaluk.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/et5jju8v0emn99ohca9p8kt8t1/31329058070.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/161335904c8ad7---54827935440.pdfIn PDF document text
    • http://netart.hu/userfiles/file/3511095313.pdfIn PDF document text
    • http://hitmet.slektenkaas.com/bilder/file/tobopojuponofagokibakixu.pdfIn PDF document text
    • http://linuxnewyork.com/draft/media/5350410388.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=fall+guys+ultimate+knockout+free+download+androidPDF link annotation
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/25907307871.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_off0000d7e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E8 11188 bytes
SHA-256: cd1b01579006ce654c67087dd1db234b5db93562840d8c9e9572b6d40cbb1ab0
font_01_sfnt_off0000f1f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F3 18248 bytes
SHA-256: a31f54bf6c0354d7872eaadad5570c27643283fd9de77a8237b9139c0d43eabf
font_02_sfnt_off000121a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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