Malicious PDF — malware analysis report

Static analysis result for SHA-256 14245c890844e830…

MALICIOUS

PDF

85.9 KB Created: 2021-06-24 21:14:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 36ec357700b0e8e4b2d848e00de20f00 SHA-1: 00908752b4f96e9298b74690579002404ed60018 SHA-256: 14245c890844e8302795e4eb735c756d7dfc120e729725566b0b2fbbdfc06993
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs, many pointing to compromised WordPress upload directories, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=tone+of+voice+guidelines PDF link annotation
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160c9707ae1305---48546236054.pdfIn PDF document text
    • http://nfc.soo.jp/file/89169828322.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ca54a424404---7976975541.pdfIn PDF document text
    • http://thongthien.vn/upload/files/wavunedulepumikaro.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/pmvsrs8270fu3atnqsm29tlchu/82272707698.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a896bf93689---63244211137.pdfIn PDF document text
    • http://rotarylaspalmas.orgdocumentos/file/jupadafabodalosu.pdfIn PDF document text
    • https://kalewebsatis.com/calisma2/files/uploads/22215785079.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/sabavogoxolipadapup.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/vovutu.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/nhh49v0akmj1g8kg51e812uh7f/fexagametosemeza.pdfIn PDF document text
    • http://armanetti.com/images/kajivoxazibubojegifipefoz.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/2s099olkvibmb3rsocrqqd8rpk/maxurapixaxotufop.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/9b249f732cfbecb986c336e8c2ac45a9/20520226883.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/38fb33bf01bd8c3beb01b23f04bfae48/poduzarerig.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000113c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C3 4892 bytes
SHA-256: 0fe536a7fe346ed62be5a68253536621a69d61af243c18ffd5406177cafb56c4
font_01_sfnt_off0001248f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1248F 11752 bytes
SHA-256: 9f2fc62b29f49f2bcf0157a9d988db063631bb016834af8fee902ed15e4f4ddb

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