Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebf53e2b4e7bdb64…

MALICIOUS

PDF

71.5 KB Created: 2021-09-26 05:11:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 92f44a65ca16aaeca28e9a3b99866af7 SHA-1: 5a6d0e8e5c406725b3a93f48d6d4e31cb03073c6 SHA-256: ebf53e2b4e7bdb64847094bd3e5af7499501c18cd779f050013a0decd3cd62e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many hosted on compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://drafthe.ru/uplcv?utm_term=face+recognition+opencv+android PDF link annotation
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614c7c7a56d78---67428129850.pdfIn PDF document text
    • http://ellev.fr/upload/files/zerumu.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/b9cd8be0751b0d169e1f8b2050b7c69c/fiboxopuw.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/4hrstdascmglfkg0pf342u07il/dogijufisajuloxubaje.pdfIn PDF document text
    • http://taigesw.com/upload/files/lofepoteleni.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/3442c184b8eae35dd890a7f4aff71df5/xizutufisetapoxivi.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/b8f4675b13eebb7aca3dc1045a42d38a/37777516139.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/88260207675.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/jewabuxakonoligevenulaka.pdfIn PDF document text
    • https://trisyscom.com/userfiles/file/tajolugakofe.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/84051431813.pdfIn PDF document text
    • http://chinawin-consult.com/userfiles/gifirov.pdfIn PDF document text
    • https://photopoligrafic.ru/ckfinder/userfiles/files/78022484381.pdfIn PDF document text
    • http://fructusartis.com/i/File/fifolunoxapufinenimoko.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/17197131476.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/midofefixam.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/tawemejalujaxoxokebizoxap.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/59353972099.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/5939ca6603681b671adf27ba995b1576/54090203604.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210912123809.pdfIn PDF document text
    • http://khojedu.net/userfiles/file/30609910036.pdfIn PDF document text
    • https://citronel.com/userfiles/files/23497005826.pdfIn PDF document text
    • http://karcannakliyat.com/userfiles/file/65460718016.pdfIn PDF document text
    • http://vps73.juicy-group.com/editor_upload_image/file/94137507898.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_off0000b1c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1C8 18000 bytes
SHA-256: de4a3ae7e25091c6157f2b3ee3e8dcfca12dbfbc189a242abedc7e7630611dc7
font_01_sfnt_off0000e090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE090 10516 bytes
SHA-256: 0108baf3d62b6717b8100f7a4cd21be43628fcfd211fc4fd068230e8f9cda649
font_02_sfnt_off0000f868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF868 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1