Malicious PDF — malware analysis report

Static analysis result for SHA-256 363650b27a758d76…

MALICIOUS

PDF

70.3 KB Created: 2021-09-14 01:29:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dba4c9ab8a0916237017d5b2e7871e0c SHA-1: 14ade50ef8130d0861472243133cf502665b01f3 SHA-256: 363650b27a758d76d359f7ee6a34f3dde39227b3e05ef72239482c34b1630a42
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a significant number of external URIs pointing to various domains, many of which appear to be part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates these links are on disposable hosting and likely serve to redirect users to malicious content or phishing sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://crysiq.ru/uplcv?utm_term=my+life+in+new+york+android+game+download PDF link annotation
    • http://betheaskssd.com/flash/betheaskssd.com/file/sudapozonek.pdfIn PDF document text
    • https://lrsdev.com/userfiles/file/xasofubiwabijinizakisatix.pdfIn PDF document text
    • http://torby.kbo.pl/ckfinder/userfiles/files/57836391383.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/65622169874.pdfIn PDF document text
    • https://xn--bankkrtya-41a.hu/js/ckfinder/userfiles/files/fokawegovomaxasexol.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/9b5c9f61b79b7dcc4f88c0dc6fe2ce01/ragupufoxam.pdfIn PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/12808286571.pdfIn PDF document text
    • http://safetyassessmentsolutions.co.uk/ckfinder/userfiles/files/57742872912.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/nisovavonam.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/tedudimojapabobifanojufiz.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/13377434946.pdfIn PDF document text
    • https://butchercurnow.com/img/shop/contents/gowujugabudojaterijetub.pdfIn PDF document text
    • http://www.octopus-quatuorvocal.com/ckfinder/userfiles/files/wasoxujijozovemujut.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b65a94330---10172691853.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139fa816923f---jatowixakajanezava.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/2665902505.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/ram128u95oarc1726sr2ab0ode/32034790379.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6fc8cc643---moxokulasozigomepuluzuwot.pdfIn PDF document text
    • https://zhongzing.com/uploads/files/202109020336526338.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/jibasalogofewawonesekun.pdfIn PDF document text
    • https://konzolstudio.ro/uploaded_files/file/wirofulosinatatoxo.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/kijerakepuwitabelu.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_off0000b393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB393 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA5 15828 bytes
SHA-256: f0b8ce5acefaad0fe1df1966aa053051bb7dfa913076cbf64ed45fc0c8449b7e
font_02_sfnt_off0000f315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF315 10716 bytes
SHA-256: d89435b0612c5e158b68185ce909c0236f5d335d93e92f44d2a030ea6cd15b4c

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