Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b93a8ac1339685e…

MALICIOUS

PDF

85.8 KB Created: 2021-07-04 02:58:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 9a9e46132230718b94d90cf0b7bbe3ef SHA-1: 8894f5badbef095215b4f796f3cc5a0c372a723d SHA-256: 4b93a8ac1339685ec516bcd2ac76d5f70ba2ebe6a4de47caf8058d9cc5e0628e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised websites, many of which host other PDF files, suggesting a link farm or redirection mechanism. The presence of these links indicates an attempt to direct users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/leio8c4uau2dehfqc1adluj6qc/pajikire.pdf In PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e9ce9484d---dofaje.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607796f351390---23141285641.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/xegazuburakesirusegoderi.pdfIn PDF document text
    • http://tktravel.shop/FileData/ckfinder/files/20210608_F8E0DF507762F85A.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160873bb1d3902---luxeke.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/59200782582.pdfIn PDF document text
    • http://fairview68.org/clients/c/ca/ca24e3df3ff7fa9b839de6c08aba9959/File/67409136529.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d97018cea8---punogowofisojazusulurirur.pdfIn PDF document text
    • http://gamebonda.com/ckupload/files/towimitepowifowikijivoj.pdfIn PDF document text
    • http://kanstm.com/ckupload/files/14778515023.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16075d6e99b0f6---sodukukubusezujonowenuseg.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/16203732549.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/d169653262e84669ea4ec9b22eb33308/taxibixunabi.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/ke59d9idbchbhj3i6i9dgbflfu/93629708936.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/41c863501c940a026174dbd99dbca2d7/fusawa.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607288c41f0e9---86122800550.pdfIn PDF document text
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/d3d7fbba15ab2c9c9a7987662b64e0e4/26964818878.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/c1666190b59470bb21240820a347bcde/40574112767.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085755fcf655---zofefarurarefefizobax.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/15131815242.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/78933994657.pdfIn PDF document text
    • http://gloucesterclassof81.com/clients/23558/File/vepozowasasigevaxumutode.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/worup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=flair+in+tagalogPDF 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_off0000eb4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10365 9960 bytes
SHA-256: 913346f3a8a8767c11ee3257cb3aa9391d77838284ee9ef2fc05bcac2c951fff
font_02_sfnt_off00011978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11978 18040 bytes
SHA-256: 555d9167cf9d57f1322d8c5e203d9c28b8514c668b67183be734b78a54cfeb77

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