Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b3dc963764f3610…

MALICIOUS

PDF

84.8 KB Created: 2021-09-05 22:00:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 15aa3af3f9ecaddf8039c8083071a467 SHA-1: 0d5ccb24977e13ce4cf9845dec95c54b7ba831bc SHA-256: 3b3dc963764f36109ef9ee137b983b8b0c1cb7de9918b8d82de5fff33d1fdfaa
196 Risk Score

Malware Insights

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

This PDF file was detected by ClamAV as a phishing trojan. Heuristics indicate it contains a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to distribute malicious content. The document also contains an instruction to disable security software, a critical indicator of malicious intent. While no scripts were directly extracted, the presence of external links and the security bypass instruction strongly suggest the document is designed to facilitate further malicious activity, likely involving the execution of additional payloads or redirection to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://garglob.ru/uplcv?utm_term=open+pdf+file+in+js PDF link annotation
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c35b1608c11---6407337583.pdfIn PDF document text
    • http://abwcockeysville.com/uploads/files/dolazaru.pdfIn PDF document text
    • http://spiregene.com/image/files/20210705_110221.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160831b0a273a8---15822636982.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/50781287715.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a38a1f20c8---saniduvidegotekon.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/7n9a3rumi95s9osnb1fpjpkge0/wopisuserataga.pdfIn PDF document text
    • https://seltec.io/images/uploads/files/menabufubeso.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/47b7f122c1a8903cbee0ee79087ebc08/rawoluxewatevi.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/naxizunezogobazuwutaguwib.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/medaxizafowes.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/2e202400448bdd73f29c81d724c4db3f/nukenadigedu.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/zekuwaba.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/gejoridetorafi.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/ziweboxofevomawugati.pdfIn PDF document text
    • http://duz-drustvo.si/uporabnik/file/womevoparudewuseravek.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f22f95387---kuzisuxasozade.pdfIn PDF document text
    • http://intemhathanh.com/img_duhoc/files/vuwegokuzigujuxek.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/79984376297.pdfIn PDF document text
    • https://espaciocultivarte.com/ckfinder/userfiles/files/rabifita.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/loravobulesebaniraxefi.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/100ca72c962ddb7efdff808f6f230e6b/renigolovugep.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_off0000e771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE771 10168 bytes
SHA-256: 7ff66a9f130389e66dae14f235134fe99f0cd9301f284a4ded199aa3f310dbe6
font_01_sfnt_off0000fe3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3C 18188 bytes
SHA-256: f0fe2d30d14f5c8f1642f66d1163748e224059866d663dd5e8817fe1e6de1167
font_02_sfnt_off00012d71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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