Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffffd360639fef27…

MALICIOUS

PDF

75.0 KB Created: 2021-09-04 13:46:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bb0e09a76d20e10dd1b6cf2a79518afe SHA-1: 460d13262f0cd4f70dd8078ba368214f969ddd1f SHA-256: ffffd360639fef27574757441e79d21bcb926b70d124ff53a5074a9b518ec350
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

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 https://playerpress.com/ckfinder/userfiles/files/matanitunanamex.pdf In PDF document text
    • http://bodemveenweiden.nl/bodem-veenweiden-img/mubedekofodug.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/t7n8t9bhpbkaaite66n2rb7rh7/xikikoz.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/a67gaitknmqq3q9jjunvetag0d/gujuge.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/sidezomutixesokeguxurun.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/jofozumopobaboxozuxuv.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/gokewuwexuja.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/0dbdq5nqcdnk0v5ufheclp883h/12196395931.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/lafawawoduni.pdfIn PDF document text
    • http://garderoba.sk/images/_file/dukunaxaxinobetafopewija.pdfIn PDF document text
    • http://onellenorzes.com/uploads/files/76544732942.pdfIn PDF document text
    • http://industrialdevices.in/uploads/peponasazimagub.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/58400637192.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3987572e8b---jujabosopepot.pdfIn PDF document text
    • https://falconshipping-uae.com/userfiles/files/tekopanumuza.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4abf0b7f01---76249079460.pdfIn PDF document text
    • https://naoshima-habitant.com/84994031253.pdfIn PDF document text
    • http://alaskacounseling.org/clients/8/87/870ae3779d21e956d596131c1dd113ff/File/83678439172.pdfIn PDF document text
    • http://zhhyhb.com/uploadfiles/files/rifuvavukilugomojebefese.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/pakazenowe.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/korukonageso.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f6aaf59c177---xadofonapuwarovu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=kindergarten+reading+stories+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_off0000c168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC168 17264 bytes
SHA-256: ebcbed8c2021e559b70dd9129bba546ada8fe83a6078dc6cb3bbde9e0afdfcbf
font_01_sfnt_off0000ee7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7A 10616 bytes
SHA-256: cdab270d0d7069cf151e308a7b1c00cd2c526a689613d30c2cee449cd3f1a56b
font_02_sfnt_off000106a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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