Malicious PDF — malware analysis report

Static analysis result for SHA-256 351f36ae13efc9b5…

MALICIOUS

PDF

82.7 KB Created: 2021-08-25 05:48:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d5461395489a328f7339a0a81bff5595 SHA-1: 90557a08f0ebfb875ab6d1c9dfff06f7526d3e7a SHA-256: 351f36ae13efc9b519a86ae6787b67f9b42d1165cb4f7f1e33fa3240e9a9d438
196 Risk Score

Malware Insights

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

This PDF document is classified as malicious by ML models and ClamAV, exhibiting characteristics of a ClickFix social engineering attack. The document likely attempts to deceive the user into executing a command, which in turn would download and execute a second-stage payload from one of the numerous embedded URLs. The presence of multiple compromised CMS upload links and disposable hosting further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a90a3d0c242---kavadoworibuwurupu.pdf In PDF document text
    • http://bethelcommunityone.com/clients/880032/File/22466455869.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/rivibanuxisilutaxujeg.pdfIn PDF document text
    • http://nemochem.cn/upload/files/93849800383.pdfIn PDF document text
    • http://moda-minulosti.cz/docs/momin/file/domojogajamazus.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/f0a3dab132c586a5b8bd4bd69b24f8e8/69224830154.pdfIn PDF document text
    • https://metnar.pl/web/uploads/files/7843922899.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/fbbb848668cdc664fa9f831fb4474836/vizumosumakufupomigiporov.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdba73e0b8---xepegujoreruramuxav.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16070c1d6bd45e---joxiravonemerejumes.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/035954613a377f923272c9b17bd2f48a/45072487399.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/od05b5ucpr0f38kf774vjd84gh/82537665531.pdfIn PDF document text
    • http://sattamatkapatti.com/userfiles/file/lurupagudoko.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/83980718547.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/43871945627.pdfIn PDF document text
    • https://bselink.com/userfiles/file/zalupefojenonepixewulap.pdfIn PDF document text
    • https://strategie-forex.com/ckfinder/userfiles/files/86571801749.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/333od6ff85anh1h1kp8h4mj9tm/detex.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608db6480ac83---93155462973.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/77026193968.pdfIn PDF document text
    • http://chromatographvials.com/d/files/rakanetakixakeluner.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/bavufazalu.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/gapofiri.pdfIn PDF document text
    • https://kochitaxirental.com/ckfinder/userfiles/files/95449107652.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b9742d2132f---76017189464.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=answer+texts+on+pcPDF 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_off0000e08c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08C 10236 bytes
SHA-256: 77257b12200785d828f53d8c4ac525e0009af6836e513c1a7597e37edec8c7bf
font_01_sfnt_off0000f7cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE1 17152 bytes
SHA-256: 30002155c7dc9e8c4a31f4450e0220e5bb16c7692f5391f24e9245972d2d1e8f

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