Malicious PDF — malware analysis report

Static analysis result for SHA-256 108fa836b3fe8a4c…

MALICIOUS

PDF

81.6 KB Created: 2021-09-07 13:34:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f7a14c1f17ac7cf1ddd355f08e8d8c08 SHA-1: e662bc5ada87fd8d2e39f184efe7ad418753d6ac SHA-256: 108fa836b3fe8a4cece4a1c0272b48ef1b268269d8385c9cc9a8aa50e11cd212
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to obscure the final destination. The PDF structure and embedded URLs are consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://przyrodnik-kujawy.eu/userfiles/file/xitutopamaruk.pdf In PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/452lhrdijc8k9cvjigv21rplgl/57533705547.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/dce109463fd032150b3fc7076d2bbe9e/vogokabotajafofafuza.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607aeff08860d---gokum.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/kawexexenilawasopotoni.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/37415009084.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/2b19d8945575915c501c21833fe40dae/37430492461.pdfIn PDF document text
    • http://englishkan.net/UserFiles/File/bowijunejazewejosiwasusaj.pdfIn PDF document text
    • http://joewhitefamilysite.com/clients/59967/File/21817504287.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9c93e1f83---43804968557.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/nekurokowav.pdfIn PDF document text
    • https://libertyrealestate.in/ckfinder/userfiles/files/vanazupawudiwiguwogefe.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/97646625980.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/53838518174.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/29c57ca77f25823a4b82c4f79c2302f6/lipidesuzonexodedibozenik.pdfIn PDF document text
    • https://craft-personal.de/userfiles/file/90305673157.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/4258def3167b3b9e25e00758bf7600d7/lanomiveboxegito.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/2b417d3855fdcf55b8010a5bffa1560e/90462167515.pdfIn PDF document text
    • http://trunghungplastic.com/luutru/files/93149131833.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210630175730.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/64154877453.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=%C3%A9tica+empresarial+e+profissional+pdfPDF 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_off0000d4e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E6 10780 bytes
SHA-256: c219b9aff203f5591f3054809ff4b35efba0899979a3802f8639179fea527e61
font_01_sfnt_off0000edaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAF 19752 bytes
SHA-256: 8a7dda6d3d63d84c1bf6bf7ad3a54137905816f0c11eaa90dc13e4c6d92f1726
font_02_sfnt_off00011e6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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