Malicious PDF — malware analysis report

Static analysis result for SHA-256 f050e468e8f3c6ef…

MALICIOUS

PDF

74.7 KB Created: 2021-10-18 07:09:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: c084b826802eaabe7e08609d856e1672 SHA-1: e4242a7679363abe5558bd4deb778936e296ceff SHA-256: f050e468e8f3c6efda278a7aee5184e5cffdd3c73793a4d54eb74d791baf0153
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating numerous links on different hosts, suggesting an attempt to distribute malicious content or phish for credentials. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://lilipoupoli-drama.gr/lilipoupoli/js/ckfinder/userfiles/files/42218087112.pdf In PDF document text
    • https://mimpidia.com/contents/files/tozan.pdfIn PDF document text
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/gipedoka.pdfIn PDF document text
    • http://sensitiva.fi/UserFiles/File/murusavun.pdfIn PDF document text
    • http://vesimport.ru/userfiles/file/74979771413.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/46061113586.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140bc1954c6d---nagimewofopiwarexiluxikab.pdfIn PDF document text
    • http://unibeauty.com.br/ckfinder/userfiles/files/xufubixiv.pdfIn PDF document text
    • https://rintrans.com/files/24727823495.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/5693265869.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/bl4oteenn8rjqq6d2h8t609ec5/73243069294.pdfIn PDF document text
    • http://hisunnychem.com/upload/files/93527319612.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5cf22947a---25297636613.pdfIn PDF document text
    • https://inc.pamlskovnik.cz/ckfinder/userfiles/files/19889935734.pdfIn PDF document text
    • https://mi-stores.com/basketballtotaal/images/editor/file/83674152200.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/lugezosejiseludinutuximop.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/mopapokisijowonezezovi.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/bejiperogova.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/92972469063.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/9266c2493e3b2458b0dbd99c932b8636/83208084501.pdfIn PDF document text
    • http://vinhthuanvietnam.com/upload/files/71960751870.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/50347574577.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/2I9n2o-U8HI/uplcv?utm_term=fortunate+son+mp3+download+freePDF 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_off0000bd23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD23 17924 bytes
SHA-256: 57d4150c996e0fd25da28cbde24f89d617f8c2a72c61439d7499c1dec70e7d3a
font_01_sfnt_off0000ebbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBC 10904 bytes
SHA-256: 360bc7ba2fa2f7ee3d85d26f15e3b5a274e4bfd93ea29d068ebed2935b59b7c2
font_02_sfnt_off00010512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10512 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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