Malicious PDF — malware analysis report

Static analysis result for SHA-256 9413142302592d0c…

MALICIOUS

PDF

70.7 KB Created: 2021-09-25 18:58:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 553d25e9b9be0fab27bade0bdfa29698 SHA-1: efa441b938b8c12c06b563e62cfe9f9de461dc4e SHA-256: 9413142302592d0cd2d5dc3a873feab4395bf03b66ae6fbfd7704359c074249e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDFs designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://queure.ru/uplcv?utm_term=usb+tethering+windows+7+driver+download PDF link annotation
    • http://agriturismolataggiasca.eu/userfiles/files/10893450771.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/56681900085.pdfIn PDF document text
    • http://lindendirect.com/tempimg/file/waberadetevumisarukuwipuf.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/tugeronotininojaduxede.pdfIn PDF document text
    • http://evola.it/userfiles/files/ratazumeligemu.pdfIn PDF document text
    • http://studioarchterreni.it/userfiles/files/balubinateloguledisem.pdfIn PDF document text
    • http://hermanosgolbano.com/admin/fckeditor/editor/filemanager/connectors/phpfile/viwiwebapujebokigopu.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a5ad672a2---80667320261.pdfIn PDF document text
    • http://scea.edu.mn/ckfinder/userfiles/files/52395196651.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/nubulufetaped.pdfIn PDF document text
    • https://nbc.com.vn/ckfinder/userfiles/files/vupawexumikifuliritibim.pdfIn PDF document text
    • https://soenen-pneus.com/upload/file/susawoligabijasuvixi.pdfIn PDF document text
    • http://vin-baietii.ro/ckfinder/userfiles/files/84886570299.pdfIn PDF document text
    • http://atel-j.nl/uploads/files/14302922998.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/rekutekokugefoximub.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613d983da562d---24979724486.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/23626697391.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ec22bd008---latuf.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/33864234194.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/nukuxewezetegodezaxadi.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/gizekuwepivanubujapam.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_off0000ae05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE05 18400 bytes
SHA-256: f7a68127d0e64ae3f7aad280351bbfa1db36cfc43518f7eccc45949a6dd1df0a
font_01_sfnt_off0000dc4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4B 10876 bytes
SHA-256: fd717312892de3d7ca60095d209b2375d24121fe0a82fab9a391ee8b10735bf3
font_02_sfnt_off0000f54b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1