Malicious PDF — malware analysis report

Static analysis result for SHA-256 753c3c74d1aa8bcf…

MALICIOUS

PDF

99.1 KB Created: 2021-09-03 13:00:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1f8ad14f41ad82fe671f3e3ae176302d SHA-1: 62b98604e4d980fa05cc6aad7140c1f9aee54c8c SHA-256: 753c3c74d1aa8bcfd1819c8555f72f48ad67eb1c77b0dc1cd5d61682c059b022
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS uploads or appear to be disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The primary attack pattern involves directing users to download further malicious content via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • 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.
  • 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 http://greenreunion.org/clients/f/fd/fd69eab1634eeea6368acebbe5d5cb0d/File/faxilopegojadated.pdf In PDF document text
    • http://xinchenfast.com/upload/file/gikefifodojevosisebali.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1607b24d759afa---puripozufinup.pdfIn PDF document text
    • https://dptech.vn/uploads/files/gisev.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/e5922450504ad07bb036ebb9c5c012de/7055380630.pdfIn PDF document text
    • http://volkshilfe-ktn.at/images/content/files/36216387142.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b906bac09---mujut.pdfIn PDF document text
    • https://www.emcp-pmce.ca/_includes/ckfinder/userfiles/files/31730655282.pdfIn PDF document text
    • https://agros.net/uploads/file/52883256793.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb2262aa27---wevudetivubewoxonodoseju.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/80882039408.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/kujubaferavamof.pdfIn PDF document text
    • http://nhadephoanhao.vn/upload/ckupload/files/16487034488.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/f053895d1dc329e14fb6eaf4ed01eb9d/xoxamajotufoxo.pdfIn PDF document text
    • http://zulassungsdienst4you.de/bilder/file/wezexupolawim.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/novotonojopibokanud.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac4eb52aba---24931948216.pdfIn PDF document text
    • http://rilta.net/userfiles/files/76491198619.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/zoxavaziwibiv.pdfIn PDF document text
    • http://airfa.it/userfiles/file/9158205930.pdfIn PDF document text
    • http://noithatnhapkhaugiasi.com/luutru/files/69637743748.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078efbc1ede7---gasolewefazaguxegudubevo.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/4706161312.pdfIn PDF document text
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/pmbhndkdhmq4rq9l424p7rbrqc/35209286974.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/e9105ea5cfd68c81d300d9ec9e070102/9873446966.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=things+fall+apart+literary+analysis+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_off00011d84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D84 10732 bytes
SHA-256: c7b24743651e573e0bcd9a56f540d4fa36d76b176ab49b578e134eed0ec10fe1
font_01_sfnt_off000135e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135E7 19104 bytes
SHA-256: 154211e38d52c078e3fc4ea17c3db167ed4ca052b028b15fc91845436e5337fa
font_02_sfnt_off0001665f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1665F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1