Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9a994f022caf1ee…

MALICIOUS

PDF

67.5 KB Created: 2021-09-27 07:11:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 81e1b9b2e0b25061293d2014d26e8741 SHA-1: e6731db42edeceda6501392939e0b83df7fecfb3 SHA-256: f9a994f022caf1ee2df3486a5570cab14aaf1872ed0e0fdda7b9929b6c836d23
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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=gangstar+new+orleans+is+offline PDF link annotation
    • http://artediapharma.com/upload/files/92280522650.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/73dbaeaf0f1b223fdb9264c53d0c42ff/7552818468.pdfIn PDF document text
    • http://sieuthimaynhapkhau.com/upload/files/76231298534.pdfIn PDF document text
    • http://chikatere.com/Upload/files/gopajotatidomigulejitojem.pdfIn PDF document text
    • http://karaokejdi.com/ckfinder/core/connector/php/upload/files/kevalibowakatibawuxuxe.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16142fb22db856---13207681888.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021090207494821.pdfIn PDF document text
    • http://sententtech.com/file_media/file_image/file/98468911522.pdfIn PDF document text
    • http://globalsocialwlefaresummit.com/app/webroot/uploads/ckuploads/files/voxilan.pdfIn PDF document text
    • https://frenstravel.com/assets/ckfinder/userfiles/files/42296824124.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/gexirofijilefirugos.pdfIn PDF document text
    • https://sonerofset.com/userfiles/file/15975727533.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/97517432169.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/10132363862.pdfIn PDF document text
    • http://dtjxbpzx.com/filespath/files/20210926065530.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/um0q8brhurs3mqf21bpdngkg71/zinewazikes.pdfIn PDF document text
    • https://5of7edwardstreet.com/assets/media/files/jerul.pdfIn PDF document text
    • http://extrastyle.ee/ckfinder/userfiles/files/62516676658.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/meveturasemi.pdfIn PDF document text
    • https://petribax.nl/userfiles/file/zomixixupedagazubimog.pdfIn PDF document text
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/62951388348.pdfIn PDF document text
    • https://www.natursany.com/ckfinder/userfiles/files/3588358187.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_off0000abff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABFF 14456 bytes
SHA-256: 89812c3ea5127d1846f8515a338fa5013f87c2c047e77f71adb3cbff1c8eee20
font_01_sfnt_off0000d06f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD06F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE886 10512 bytes
SHA-256: 9a383f1f5782ea93adf721e6deb8d35d336c82c4b0d970938901a65fec926285