Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a1407eb5b162179…

MALICIOUS

PDF

89.8 KB Created: 2021-07-08 08:06:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: acb90c2f150d3f6123aa303ca1a0628d SHA-1: cf591a3bc1f747529627673ec1f083f405c84686 SHA-256: 6a1407eb5b162179047bc11194e36b8bfbb3036b3ceb9a5cbc30d722614dcb83
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. Several URLs point to compromised CMS uploads and disposable hosting, suggesting an attempt to obscure the final malicious destination. While no scripts were explicitly extracted, the nature of PDF link farms often involves JavaScript to facilitate redirects, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://rumusjitu.com/contents//files/7197638972.pdf In PDF document text
    • https://digireg.dk/upload/72118491218.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/a11fb41164d78a54ffda9843703b2adc/70142456927.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/71264295197.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8d48bba35---sovifaminowolumide.pdfIn PDF document text
    • http://zonwering-belgie.eu/ckfinder/userfiles/files/butimupalu.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee94621cbd---22971854495.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/31fbl064ptmqhe9n9uum6s2fj2/67925509127.pdfIn PDF document text
    • https://warungmimpishio2.com/contents//files/xovotorerusukojajon.pdfIn PDF document text
    • http://www.sphotobooth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc66eba18c---38260099640.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5b2a990f4---zeseb.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/ahtbvpa32fggtqsusog06pcao7/nagefufob.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/rezigaj.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/vumomiwaxonosebus.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b67949487f---30277212488.pdfIn PDF document text
    • http://sooclose.eu/upload/File/75450633529.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/42803134367.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-5/file/kazupuwerexotikelox.pdfIn PDF document text
    • http://firstcuwire.com/file_media/file_image/file/59926035635.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a64381a43e5.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/91eb50e3e1e030bd08cc207edb076f9f/32084432464.pdfIn PDF document text
    • http://chapelguild.com/images/usr/22691235882.pdfIn PDF document text
    • http://mientrungpetrohotel.com/users/files/76867757403.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/9blmcsbocic84b8eckedoscs13/87886577251.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=rules+for+adding+and+subtracting+negative+and+positive+numbersPDF 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_off0000f7a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A3 17960 bytes
SHA-256: 8417c7609a451833081bc4470717f156c3eb61b48fd426db05245778ff6bbb73
font_01_sfnt_off0001270c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1270C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F23 11312 bytes
SHA-256: af0ced11b6c5d2c5da4c364e772948b726bbbb25716e17bdccd9cb242ece5e28

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