Malicious PDF — malware analysis report

Static analysis result for SHA-256 28da1c892394cffc…

MALICIOUS

PDF

85.5 KB Created: 2021-09-01 20:56:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: baaf904fa420bcf1036497b9bc890483 SHA-1: 16e859434461c696265f1ba9ecf0767795c579b4 SHA-256: 28da1c892394cffcce6c01a37aef9cc623c42e07cb20bcb3d01b5376c4a19dec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics indicate that this PDF likely serves as a lure to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://infrive.ru/uplcv?utm_term=n64+download+pc PDF link annotation
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/53863042750.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5c7a90061---68861464958.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/k72srv9dfctqbpqmeqt7cj041f/fuvaladezasidaragijoreb.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/zizivobutugop.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/de6c6decce4768ae18eb40a1c583359a/83955127832.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/48306378618.pdfIn PDF document text
    • https://leganordavigliana.com/uploads/file/jadumoluvaduwawe.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/36906602147.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/nojaw.pdfIn PDF document text
    • http://daiquangsico.com/img_duhoc/files/1581544843.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/dumitijifelufegavovax.pdfIn PDF document text
    • https://cecprint.com/images/file/81195050671.pdfIn PDF document text
    • https://rumputhijau.com/contents//files/sumokijixebimekaxu.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16078a77059690---59820755016.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/fm7rllfdtt6ae2nco2op98tdlj/lepamuwisoxixenowodil.pdfIn PDF document text
    • https://ecole-anglais.com/upload/files/81123657853.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/pabiwol.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/gogebopizemozi.pdfIn PDF document text
    • https://jdlpartnerss.com/userfiles/file/jologatarodijuwusufe.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/wudaxobevikuvozewesa.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113a97ddeca6---xebibalegodituz.pdfIn PDF document text
    • http://108shiva.com/userfiles/file/In PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/2f1a07dfd854d459c81420ef415a61d9/fijubovegoga.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/20457078146.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_off0000eb71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10383 17452 bytes
SHA-256: 1246289ec95ec2a57b7f6c5777c55db32673dc9042c58ca627be6df2838a49f5
font_02_sfnt_off000130e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130E7 10224 bytes
SHA-256: 181b4a6721ecea9d29ebfa89fbeea10a6c1ca2a2fef16ce2470db460bb2bbf1b

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