Malicious PDF — malware analysis report

Static analysis result for SHA-256 97c912942c6a8c4e…

MALICIOUS

PDF

92.9 KB Created: 2021-07-17 23:20:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fe01f2d764bc3dcd336ac751b452d069 SHA-1: 7fca11d5859e6aa7fedceeadcec68af946da4898 SHA-256: 97c912942c6a8c4eb7244266d70c1e34928d2bf12e926e91b8d8bf4e07ee48a2
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous links, many pointing to compromised WordPress uploads or disposable domains, suggesting it's designed to lead users to malicious content. The presence of external URI heuristics and the link farm detection further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://ccswcd.com/userfiles/file/mipanosiredudapem.pdf In PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/56056a32b5c239cc9008c059c58f3055/lubirexugeral.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/23041107532.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents//files/wufekixunar.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/a306414c7658f415e1fea7450c595bed/1230097540.pdfIn PDF document text
    • http://temple.mo/userfiles/file/winalarulejurasijafi.pdfIn PDF document text
    • http://salkim.com/userfiles/file/xobimiz.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160745fad2d555---wodenufukabopupalufuxug.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210618_09C7F9E523AFAB76.pdfIn PDF document text
    • http://littlefreddieking.com/clients/65037/File/24607815342.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/bc70fa9767e973da7da025cb77ced48c/mediguwimetobevorelusotuw.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ac21ede0401---12149822104.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d8ab7d4c3---sujupanoraku.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c4affe3afb2---pipof.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcaf153b1aa---bezuvexoluxeniwuguzu.pdfIn PDF document text
    • http://hodori247.com/uploads/files/jebugokugukigupudufewusi.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ab4310a92---64111998324.pdfIn PDF document text
    • http://cloverpark1960.com/clients/1/17/17c242f0968dc4bce059666b43fbd075/File/diranuwikifotugabubo.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/517bf79194beda3c64be17bee9e74d4e/1818881028.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16077330e61361---16103472838.pdfIn PDF document text
    • https://emmaushuis.org/pages/sewinejaxolovegefuw.pdfIn PDF document text
    • http://psychoterapia-przemysl.net/img/userfiles/file/26700483010.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/44739055448.pdfIn PDF document text
    • http://caythuocdangian.net/images/files/rexumaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=vba+add+new+sheet+and+renamePDF 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_off00010793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10793 10452 bytes
SHA-256: 16be1edb0bf90707b8a4b242b1d262312a63b13e3c6d111e332c9575f9aac18e
font_01_sfnt_off00011f31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13743 17840 bytes
SHA-256: 3a73bcb77edd2d672886ec3b073efd7970c8f2b06860652670d480c98c03912c