Malicious PDF — malware analysis report

Static analysis result for SHA-256 7174bb31c1d03f96…

MALICIOUS

PDF

70.7 KB Created: 2021-10-02 17:46:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: da8e16cef46454cb2d51cd2864a08b0b SHA-1: 3cdb214c748932be30a30d664e18731ff1e0d6f3 SHA-256: 7174bb31c1d03f96eff4df5a13bd0426748d0dde1e5bc942ebb2a70c66f4a648
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript and multiple URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution attempt. The presence of a URL with 'download talking tom for pc' indicates a lure to trick users into downloading a payload. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://krisoc.ru/uplcv?utm_term=download+talking+tom+for+pc PDF link annotation
    • http://evola.it/userfiles/files/mofatenuwirisokufajuput.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/040433cdd250d296bb541f5c21c38405/49248872758.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/48891724166.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/8bef34b8e73624de37ffbb91c50473f2/93900606565.pdfIn PDF document text
    • http://www.bash.cl/media/file/luragokaluroforazopezone.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/944af4b625d84ca1c94c27c3a86f8945/82303092970.pdfIn PDF document text
    • http://thoitrangvabaoho.com/Images_upload/files/muxida.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/mabofilazofiragelufi.pdfIn PDF document text
    • https://beldapin.com/calisma2/files/uploads/8534937326.pdfIn PDF document text
    • https://goez1.com/10005001208290177/ckfinder/userfiles/files/fujigoxadomuv.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/b345fe90d9057110d61c6df52cd51f57/vediki.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/tk3do70qm4h0pcq3fdc7ftrhdf/pijijeje.pdfIn PDF document text
    • https://sabresources.com/FCKuploads/file/67037368542.pdfIn PDF document text
    • https://denimder.org/resimler/files/misuvodapibipevudomub.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/85155900155.pdfIn PDF document text
    • http://krzeptowski.pl/file/xezowulij.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/hoihj7psn9je6iuv603aprtdbg/78626206746.pdfIn PDF document text
    • http://garage-fuji.jp/js/upload/files/pubezutediwuwove.pdfIn PDF document text
    • http://vuonlan.vn/data/upload/files/69920025953.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613efdd7853f8---84694793276.pdfIn PDF document text
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/99144116570.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/11509130020.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/46356680956.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613dbdd1adfeb---81236252720.pdfIn PDF document text
    • http://monteconsultants.com/image/upload/File/tukulexawos.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/32400734620.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_off0000b640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB640 10844 bytes
SHA-256: b79ed5a48c4a1e8f85626c557a1611f06c6ebda976e893208d15b04e58582308
font_01_sfnt_off0000cf0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF0F 15044 bytes
SHA-256: 06226b319e4fa53f25cd5bd4dd403e2cacc7717335aeed5a3253906226384ef8
font_02_sfnt_off0000f4eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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