Malicious PDF — malware analysis report

Static analysis result for SHA-256 c791269fe5a3bf1b…

MALICIOUS

PDF

81.0 KB Created: 2021-07-15 21:12:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1208ab7447f5006a2a2982fb6cf06d1c SHA-1: c75b0b56b4d00a06ae97a414b402220318d270fa SHA-256: c791269fe5a3bf1beed0da7dc3acfe70b842190f4008464de6a434aeef69c11d
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites utilizing the formcraft plugin for file uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. The document body is unreadable, but the heuristic firings and URL analysis confirm the link farm nature of the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c97189a5eff---346433563.pdf In PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/p3f9nf5h9bscogkmmtmfjl6834/51952848704.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/31614893186.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/39312188278.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/woremeso.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a272a03f639---55383223217.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160abdef375dff---42582130154.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b13d3439670---67739532885.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e1d6ff8061a---zojolugenuni.pdfIn PDF document text
    • http://samrayburnclassof1980reunion.com/clients/873185/File/fatonujununi.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/c7ea8f4c0d04cef5dc662d46e94d6408/28851725251.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16075d5b28c85d---97330354434.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/zeluvisuk.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/zogutozezodutakebesajup.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dcc36109a65---29038006558.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/9m8rs0m6ef0coc45i0imn6qmsi/4794148935.pdfIn PDF document text
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/c51esqfgcr1isbver5i2lahsdt/wiguneme.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/90628723604.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/dijovoxamifu.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/3a2be8c075df10f3e9dbf933218218fb/jovavadagudon.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/40335778441.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cac171f9f2---11442692565.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/xoxibu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=sex+linked+genetic+punnett+square+problems+answer+keyPDF 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_off0000d80d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80D 11712 bytes
SHA-256: e3cf16d3ee50cb8ba56efa604597c78f3794489777de3607fadb81448c3bac7f
font_01_sfnt_off0000f347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF347 16524 bytes
SHA-256: 699dc73a9a29600d59ce26ccaf95741d9286045aa7c26e9a9088e17c14df33a4
font_02_sfnt_off00011e01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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