Malicious PDF — malware analysis report

Static analysis result for SHA-256 33f673190b3623e6…

MALICIOUS

PDF

82.7 KB Created: 2021-09-15 14:29:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7e61d75b7035ff706e7b6dffa7b97c80 SHA-1: ce536f3a95e5fcbe28c42e9527e437875cbb3374 SHA-256: 33f673190b3623e67c9fe7030bd504ec07f18c85b027cfcb2ea423be706f41b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF link farm heuristics indicates a deliberate attempt to obscure the final destination and potentially distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://krisoc.ru/uplcv?utm_term=malaybalay+zip+code PDF link annotation
    • https://adproissy.emailingmanager.com/uploads/editor/file/tabusut.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/8a3bf1b9c37bda000bde44725c71b244/16079521274.pdfIn PDF document text
    • http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/nuvofipezekujotatimekavi.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343a897c9b0---vogorarapowolokubisija.pdfIn PDF document text
    • http://taaltoetsvo.nl/userfiles/file/58585911732.pdfIn PDF document text
    • http://gz-chengeng.com/uploadfile/files/49720692999.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2efb41579---70964557187.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/jotadejarodivalegezopaz.pdfIn PDF document text
    • https://fiscalonline.ro/app/webroot/files/userfiles/files/20020012241.pdfIn PDF document text
    • http://arablift.net/userfiles/file/didiluseb.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/voxepokumusebib.pdfIn PDF document text
    • http://haokunchem.cn/upload/files/silamafizujiwigi.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/75845819907.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346a02e5cf7---14995924044.pdfIn PDF document text
    • http://siblom.ru/files/upload/file/zepidorujunox.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136c506e3880---givumabolu.pdfIn PDF document text
    • http://briztravel.com/upload/files/65556785342.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/lf2ii0dfkql7i1lmct2bfgb2g1/befamiwawukipafimofapafux.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16140349406b5d---kukodevep.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/bejugibovivajedex.pdfIn PDF document text
    • https://sambelteri.com/contents/files/58605453376.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_off0000df82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF82 17836 bytes
SHA-256: 37dc861cc215bde0487a8d150a2aa8a20028568ddfa371f8e5bc6ba992b15edc
font_01_sfnt_off00010e21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E21 10344 bytes
SHA-256: 76dfb7fbf83ed29a4df15015d207aa720cf869a8833df8fcf870783c564d4c14
font_02_sfnt_off0001256c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1256C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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