Malicious PDF — malware analysis report

Static analysis result for SHA-256 71f96a03cb54fba7…

MALICIOUS

PDF

90.7 KB Created: 2021-09-02 08:26:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cde363c3ef1e31000a330e475371c209 SHA-1: 0da1ba9dc68b92a1a1c217d25e9529422bccdf31 SHA-256: 71f96a03cb54fba7e4be49103b5c181b5a381b67284789433d15a30f723b7aa2
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to potentially harmful websites. The presence of compromised CMS upload links further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://chcial.ru/uplcv?utm_term=world+most+biggest+cruise+ship PDF link annotation
    • http://divorce-difficile.fr/userfiles/file/64070804856.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/l588oum76322tijuu61mc8cu04/zugujebomaxurotakiwaxan.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/e3d5410ef013a0583fa06abd1b6b6c57/64115488089.pdfIn PDF document text
    • https://myveolife.com/wp-content/plugins/super-forms/uploads/php/files/72ad0bd5c638d6c9811e2d94f1541625/dupimanegal.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1dddccbb79---57191732004.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/munufudidavisanukosug.pdfIn PDF document text
    • https://yellowstonewildlife.com/mojule.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/56830648098.pdfIn PDF document text
    • http://actlogistic.vn/upload/editor/files/nanozufuwopasexipem.pdfIn PDF document text
    • https://ip-pharma.net/data/files/22581754344.pdfIn PDF document text
    • http://roleco.pl/data/aktualnosci_imgs/file/wivarepezikid.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/d6mh2jpl162p0rfj4ad3jqg4l4/jomenavazodal.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb12992eb9---tofotituzejavog.pdfIn PDF document text
    • http://veszpremlizards.hu/_user/file/18738993300.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/jitevebovezena.pdfIn PDF document text
    • http://linza-market.ru/upload/files/52518903452.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/niwegixanaduwafi.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/7f632540b0ced6b54be703ba9e8bdb37/37835908748.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c7137fb8670---tiluxux.pdfIn PDF document text
    • https://vinacomvietnam.vn/uploads/news_file/52720746928.pdfIn PDF document text
    • http://ibiforstarlight.org/clients/3/3c/3cfcca4e360ca8807b7dd7d6e7cbeae0/File/19745124907.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/27582060444.pdfIn PDF document text
    • https://ducthai.vn/userfiles/file/83426644723.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/mateviw.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/32950896162.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///72647500019.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_off0000ff49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF49 10928 bytes
SHA-256: b091efe2607d037e3960a332b43df4033052c9ec5968ea2b4778e3f6b2dbae83
font_01_sfnt_off00011833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11833 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13045 17136 bytes
SHA-256: 3af35c30974cbd04c85196e2f4f6b8c75d17f2f19233b1323d98de20a1b28932

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