Malicious PDF — malware analysis report

Static analysis result for SHA-256 07be51c0695f24df…

MALICIOUS

PDF

90.8 KB Created: 2021-08-19 14:46:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9779f331888f6c676db72c23beac5d4a SHA-1: 8b4cc6374c494fc61538beb80f2b0e6e410fa275 SHA-256: 07be51c0695f24df79c758c88b8c5a8f1f70c7558465c7b275b9b5201fbc041f
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms strongly suggests the PDF is used to drive traffic to attacker-controlled infrastructure, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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://ketchas.ru/uplcv?utm_term=download+blockpost+mobile+mod+apk+unlimited+money+and+diamond+2020 PDF link annotation
    • https://pottoka.info/files/galeria/files/19421224331.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/8211587916.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/a07ngpet56mr5426bils3bja23/61098264532.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/jemogan.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021071709420129.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/70884458962.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/gexolobamigadovepixawas.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/72aa7nhgdtokprt81pa7bucnme/rigekulonobunowilux.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/79ee593854c87fa99ad474f7e1f1b28e/nibumo.pdfIn PDF document text
    • https://norservis.com/files/files/87537998020.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/898640710dfbd8363627eef930ea298e/zadogo.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/e958c74c9b84150103bd577ac7cb1938/jevijuvuju.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/denot.pdfIn PDF document text
    • http://gpkoaee.ru/ckfinder/userfiles/files/96841952363.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1606e744c4fc8e---42233038381.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaaace39c04---86236848583.pdfIn PDF document text
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/xiradifofigosudu.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/cdf956a34548825a880102b463d54f27/mageliwerujiwiserirudo.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/nefavodak.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/fcf9f51106edd3b66de8356a8371b473/99263461835.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075273839ace---15019693673.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/3d3c57df396ee2c962055928677e9cfd/tazudurasako.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/ad914aa7d093fc3aa58c3cfef46d319d/laxotadogas.pdfIn PDF document text
    • http://jfe.hk/userfiles/60148369641.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/4mbr4acftpvps6b9v9khddkap0/31820895155.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/pf20aegchs4f051r9p279ep5fn/bagisaruj.pdfIn PDF document text
    • http://renknh.com/ckupload/files/36288953269.pdfIn PDF document text
    • 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_off0000eb08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB08 11352 bytes
SHA-256: 6778b734fa83f6ed70098c3a05ea1e092de2c4828b90fc46a6a610778fc858db
font_01_sfnt_off0001059d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059D 27380 bytes
SHA-256: d45573cea4ae733f9faf796e6efc5c8bd97418e853555d7584cc4d9b80428146
font_02_sfnt_off000143dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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