Malicious PDF — malware analysis report

Static analysis result for SHA-256 d11dcdc451b89f3f…

MALICIOUS

PDF

103.8 KB Created: 2021-08-13 18:13:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 76a98fc50612b2e9dcae4b031a281424 SHA-1: a6324a80c1353b55a61523f3c21f5c12315255f9 SHA-256: d11dcdc451b89f3f94048b6f1bccce2124cf7ea14f3577bdaeda79e40d53f4b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting, indicating a link farm designed to obscure malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://drafthe.ru/uplcv?utm_term=how+to+factory+reset+a+motorola+droid PDF link annotation
    • http://fredericjean.net/oplusco/file/27299159069.pdfIn PDF document text
    • http://at2apigroup3.com/contents//files/pumobaru.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/e57b9d6572c63c6e1351d87f281ed673/49346232796.pdfIn PDF document text
    • https://cavalier-hundezucht.ch/userfiles/file/43131193928.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/2450226401.pdfIn PDF document text
    • http://cybernet-ap.com/UserFiles/File/jegapodumopimosifol.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/1b332e7525674e9663b380df10d6dbb5/94191396917.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/19766760296.pdfIn PDF document text
    • http://riversedgefm.com/files/file/99833746368.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160c47ef8e8430---boletanonuzesimufadoma.pdfIn PDF document text
    • https://adikkedua.com/contents//files/78912948921.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/1d5038dd21e37d1bb17ac8d25dbbc2c7/purakijul.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a29749261---bopubajigawiguwimoka.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16074c8a3cddf6---kizesejugoj.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160db242de6528---lepifasumobib.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/24721f1f4409e1d59b65f6fb3db208a6/87908099446.pdfIn PDF document text
    • http://hillhouseclassof1961.com/clients/c/c9/c9b049383fb65e98d0a4dcab6c176392/File/52408566804.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/fixixaxiwiwaz.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/l1ufu3jntnrh4ioc46vnttk24i/82947068392.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/3727073586.pdfIn PDF document text
    • http://eraucheta.ru/uploads/file/lujesewaxuxuko.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16096d4c9845f9---61370842622.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_off00012f13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F13 17844 bytes
SHA-256: fd4a35ad4f7f9f4c52b0278509bfe06cf28325e281ba1fc9a83e4271174e2621
font_01_sfnt_off00015de4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000175fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175FB 10724 bytes
SHA-256: 48e9b193ddc667d08e82191a5c4987d52870e7fb2f8e856966e53ddaccef6725

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