Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd9bab1e9eaa2a2b…

MALICIOUS

PDF

78.7 KB Created: 2021-09-06 00:50:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 2514008e86c13ed72753897fff259a4c SHA-1: 6cbc25d896fec73f16b161b578e9c5bf6ca795bd SHA-256: bd9bab1e9eaa2a2bc5de082981177a38b315272273d7fdc67999dcbea66c062d
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a99170cda65---79238487735.pdf In PDF document text
    • http://uzmansporzeminkaplama.com/resimler/files/zejas.pdfIn PDF document text
    • http://josephlillianmorrisfamily.com/clients/59960/File/lazopuduvakumafofo.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de90e34575---59377384831.pdfIn PDF document text
    • http://dlzhrjd.com/images/uploadfile/files/98963527147.pdfIn PDF document text
    • http://learningkey.org/userfiles/67343948995.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16093e082a48e7---zenujakomiwigivew.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/42089424838.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/febujikurebifovitixakogo.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b69932a62---dapujigexurefi.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac68dc36fd9---biwokofetuw.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/3a95ad5fe85bda6150e864aa1ce8b108/porugobonuvunejur.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3d292e6d8---57393741488.pdfIn PDF document text
    • http://applecentervn.com/uploads/image/files/78438039388.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/bureleludiwukurekogira.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/41ac3adef6585f00414eaa1c79bdfa82/99476086212.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/40687335202.pdfIn PDF document text
    • http://schnauzermountainminiatures.com/clients/17729/File/81562438253.pdfIn PDF document text
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/zufoforijad.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/wemudub.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607b00c72b2a9---66116622826.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/labelisafano.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/fafefobapepojesude.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b79446b0ab5---mavewavofesobosave.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/tejumowuvuvuralos.pdfIn PDF document text
    • https://keluargamimpi.com/contents/files/21503315200.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=pentair+intellichlor+salt+chlorine+generator+manualPDF 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_off0000cb1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1F 10776 bytes
SHA-256: 1f744b7ebdcd587213cf16cf8c5443155271f7c00ae669e7ca95a6d5df9eaa22
font_01_sfnt_off0000e3c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C8 18596 bytes
SHA-256: 186ff9edcc2b967b5ff589033a287ebf8ad5c9103109546ffcf94f5f9e843302
font_02_sfnt_off000113ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1