Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc1f3a5860ebeef9…

MALICIOUS

PDF

72.2 KB Created: 2021-09-02 10:04:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7a5c6464121c752fce367f1910e82c10 SHA-1: 563a7381625a5de46539df8b7a1523ecac954d6e SHA-256: fc1f3a5860ebeef9d3a6fc3d5deaad33fb0fe350e833acf8617c4491a121a5b2
96 Risk Score

Malware Insights

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

This PDF file is identified as malicious by an ML classifier and contains numerous links pointing to compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates that the PDF is a link farm on disposable hosting, suggesting its purpose is to manipulate search engine rankings or redirect users to potentially harmful content. The presence of external URIs and links to compromised CMS uploads further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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://pixomot.ru/uplcv?utm_term=best+anime+movies+site PDF link annotation
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074335ca1db7---xogan.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/prsn7k11b0kq52cnmg3fbj8pi4/49022848078.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/90133657848.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/qdcfohglaj6tpo0o4sn27j77t3/tavitebafabu.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/24500181856.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607974cb95f96---10169588502.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160774fe718b04---kutusoloxinij.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/62521d4cf06f9aacbf66510513df27a2/gifefutam.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/poteka.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/e804d75af887011bdc53e85f19351f37/37362420461.pdfIn PDF document text
    • https://mytopics.it/uploads/file/suwurififofewuvore.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/o6ekkr15nbrrj9q3cibdufrkcn/56764405308.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/94v4d9p9u16o6oifkrjj1sirts/23396146956.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/81863601575.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/41760022790.pdfIn PDF document text
    • https://roshnaai.com/ckfinder/userfiles/files/86609821057.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606eaac8b6c1f---fivovezekefali.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/fupesi.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/94b4fb896a4a4e18fe058729f1df5e8f/95468871852.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ff48873150f---80037882340.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/77460026239.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c632324a6c---34646933516.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606e7072c23b7---fetolariwuronowa.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/fonamudoxelunizarowesur.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/28303556115.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_off0000bc24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC24 10244 bytes
SHA-256: b6e3836a8db1290c3351505f6883627164c44f64192ffc7b80da80802307ef37
font_01_sfnt_off0000d337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD337 15780 bytes
SHA-256: b538e154a51dfda6b09ce0d9a74f4bf2c1e76806506e17b6323a1f0dd0f128e2
font_02_sfnt_off0000faac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1