Malicious PDF — malware analysis report

Static analysis result for SHA-256 27c133c94a8eed76…

MALICIOUS

PDF

88.7 KB Created: 2021-09-19 05:09:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4f40a32ad7ea5e84883f912df1e3c69f SHA-1: baf096adc88d86186d16acb562c3f460d49e162b SHA-256: 27c133c94a8eed76f0a4bf01dff20ac36c1eb76a26bbee627a9482e62b99efd0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to compromised or disposable hosting, indicative of a link farm used for phishing or malware delivery. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior align with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://allytemp.ru/uplcv?utm_term=hairstyles+that+frame+the+face PDF link annotation
    • https://keepingscore.org/userfiles/file/rizejunejerogevewixivem.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/23182793172.pdfIn PDF document text
    • https://vili-al.com/uploads/wysiwyg/files/20906328952.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/93488443489.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4b86d862e---87410138300.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/76701794494.pdfIn PDF document text
    • http://gwtcs.org/Content/uploads/files/figap.pdfIn PDF document text
    • https://medtek.vn/storage/file/58702611441.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/9820268150.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/sufasowo.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/lizepigadewiwor.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/5598808849.pdfIn PDF document text
    • http://xn----dtbhwhggdaoqfh3d.xn--p1ai/media/file/vipimarunabo.pdfIn PDF document text
    • http://euskararenginkana.eus/files/galeria/files/netefusif.pdfIn PDF document text
    • http://emploi.nat.tn/ckeditor/ckfinder/userfiles/files/wijedipazaxifowe.pdfIn PDF document text
    • https://bisleriuber.genefied.co/ckfinder/userfiles/files/52400947260.pdfIn PDF document text
    • http://kingsap.com/file_media/file_image/file/mujedaroloxunivu.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/tach307sgpru1fmeinrtbhgcs6/79018692345.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/893139973.pdfIn PDF document text
    • https://nasco-ye.com/uploads/file/22412572401.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/33061578831.pdfIn PDF document text
    • http://maihome.hu/admin1/file/taxibuvunelosenevazirad.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/5hu76aik8ecalejpuc01be6psi/fumofow.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_off0000f623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF623 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E35 18212 bytes
SHA-256: 990933a646acfb64815cc4efda76e5382617c1cb566202e54ce96b4a7130dba1
font_02_sfnt_off00013d00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D00 10480 bytes
SHA-256: 67659f8cfc5d8f3bb51b252fb2acc4a8cb1557a2782961b4a03a529868c7e16b