Malicious PDF — malware analysis report

Static analysis result for SHA-256 424644a61566103a…

MALICIOUS

PDF

81.4 KB Created: 2021-09-20 19:38:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5123a41edee3b9636f593a2409b7d41d SHA-1: 76d09686748a1a71b8335bd33550bd0ea2f72518 SHA-256: 424644a61566103aef5ae1b7026f3aba3bf4bcd681945017419e3841458ebf3d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with link farms and potentially compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 https://pixomot.ru/uplcv?utm_term=how+to+download+ig+videos PDF link annotation
    • http://webs123.com/userfiles/file/79058199017.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/donuzizijalu.pdfIn PDF document text
    • http://khangvietdn.com/uploads/file/78935778214.pdfIn PDF document text
    • http://tecksco.com/upload/files/36808962058.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/62249076716.pdfIn PDF document text
    • https://martabaktelor.com/contents/files/ruzegora.pdfIn PDF document text
    • https://gopherscopes.com/userfiles/file/dutifiwujixoxakenoso.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/b5d20a5680c471289197fda7488d00c5/53346086956.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/tixepufufaxabafofozuriza.pdfIn PDF document text
    • http://asqcert.net/files/files/8484311084.pdfIn PDF document text
    • http://henanshuangxin.com/d/files/kudis.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/zavurogitiboravefirin.pdfIn PDF document text
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/43231604297.pdfIn PDF document text
    • http://thebankcardservice.com/uploads/files/48966275172.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/vk4cbm1p2jc63pjsrm3p11fup0/4562938442.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/diwobapojumulelanimoto.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16146a1c0d73be---guzizopeposuxulodetowix.pdfIn PDF document text
    • http://xn----dtbhwhggdaoqfh3d.xn--p1ai/media/file/lowoxaxebazavugex.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/76933931325.pdfIn PDF document text
    • https://tennis-samara.ru/img/file/41607653090.pdfIn PDF document text
    • http://shopphutungmayphat.com/upload/img/files/75951464403.pdfIn PDF document text
    • http://0975811252cool.linker.tw/files/nuwuxuk.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/repomejukuxijorevekito.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/fapabowepadirogovadupuraw.pdfIn PDF document text
    • https://triosms.com/userfiles/file/19050169492.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/29757635044.pdfIn PDF document text
    • https://khogiaydantuonghanquoc.com/images/news/file/99318271338.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_off0000d919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD919 18124 bytes
SHA-256: 0ac9dffb58f67e6ab00d0504244fac4917ab86271a44f503d02994a08d078dce
font_01_sfnt_off0001082b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12042 10464 bytes
SHA-256: bcbaecc216624160c871c552e288bc72f41d238237570039d3646d54d22007cb

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