Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e8407e19b18f92a…

MALICIOUS

PDF

83.7 KB Created: 2021-08-16 12:49:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1e07ead3e4b2b2f2286ba0c08e1a9eee SHA-1: 1162b65503feb6da0a6589bab62d856381dc00c1 SHA-256: 4e8407e19b18f92a8181a1d8b906e6c9826e5cd6f8cb836e2af1b86d0967c71d
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute traffic or potentially lead users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://alkalacarservice.com/public_html/userfiles/file/zemopupavobitulageva.pdf In PDF document text
    • http://arohitourandtravels.com/userfiles/file/dapomuterujugel.pdfIn PDF document text
    • http://huimao.com/upload/bizibize.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f889a80d6ae---24435189975.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/10283694139.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/sutaxosotukenimedemi.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/maremibur.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/49905783776.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/binonutod.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e650cc946da---68692623796.pdfIn PDF document text
    • http://sweetbasketsbyjackie.com/clients/864293/File/85352677781.pdfIn PDF document text
    • https://studiopros.com/userfiles/file/In PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/66ef6c894030b87c10936b20e5cdbfad/99754333353.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16082b8eff3a08---kinaxonixiranag.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/5c31ea204ef05bb996137db753a652cb/71633445904.pdfIn PDF document text
    • http://modamoda.nl/uploads/pic_lib/file/44481905243.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/okkvf52r2k8imkggrg3ibprend/12549824626.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e045b37c51d---83108876149.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2211012520---97298453967.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cc5f5c09563---92457981649.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/56393602675.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/sakema.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=davis%27s+drug+guide+for+nurses+12th+edition+pdfPDF 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_off0000dff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF802 17644 bytes
SHA-256: 2808685157d0dbe24bf6d98fd9eca6e7d0adc2ae2e39ce5c3e20ec2b5b9c3947
font_02_sfnt_off00012673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12673 11104 bytes
SHA-256: 41e5ffe9935b0a82c17a6f2f16ac0a2c5571edd7d625e0e826151213d4a71daf

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