Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0d4a7b938a5d1d2…

MALICIOUS

PDF

80.1 KB Created: 2021-09-05 15:58:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 675962c300b361db8a7571f4c0140357 SHA-1: 4acfe65c24c15a83284661e77c0e153d486f0ba9 SHA-256: f0d4a7b938a5d1d23ccf0f7fb9ac5f318c55b64967fd7166d84f8156debcbc22
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9900

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://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e5dc3262c---27938320005.pdf In PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609121d876239---zavuzok.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/63804388272.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/zavajonixuzabima.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606c918b8c35c---venifunozuxoner.pdfIn PDF document text
    • https://www.syria-report.com/sites/all/libraries/ckfinder/userfiles/files/fonotad.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb7e0cb541a---zafim.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/73851847371.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/4fa9f5cc499797228517f2f0ee771d30/lafefesukoxalubobi.pdfIn PDF document text
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/90113598544.pdfIn PDF document text
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/32620143577.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/pepomosixewi.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/zejuwemojebosutufupogoj.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/62287687561.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bda98b1da0c---52661653329.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/7207b8c35fe93c395c76dc80dc99c490/71027092399.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df8ea18ed16---taramigero.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/55e744f5c6ad26c023f30cf5f6f07dfc/karudemolugalanigepijab.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160982eb525574---72166659795.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/fanuto.pdfIn PDF document text
    • https://vinacomvietnam.vn/uploads/news_file/37458965124.pdfIn PDF document text
    • http://chongros.com/userData/board/file/wowelawamo.pdfIn PDF document text
    • http://www.toptehnik.si/images/50559391990.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/97175f48e4a744969c9f98f0c392a147/39081218709.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607d357a328fd---vawumilanexolovekopuvikuv.pdfIn PDF document text
    • https://reparation-mobile.net/userfiles/file/visikeluxedapak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=foxconn+n15235+manual+espa%C3%B1olPDF 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_off0000cecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCECC 11108 bytes
SHA-256: 6ed95552507c95cceb642e9e765bb25aeb53f24af00fe141a0586f06f92521a0
font_01_sfnt_off0000e89c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89C 18280 bytes
SHA-256: 8e4f8744f76c7c50ed2cfbe1966a0b9d1cfb6c3e0b4201efa763d63c3de16c8f
font_02_sfnt_off00011846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11846 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1