Malicious PDF — malware analysis report

Static analysis result for SHA-256 96681e77cf1744e5…

MALICIOUS

PDF

75.5 KB Created: 2021-07-12 16:09:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: af176fc24fb08f63a6e5c3838940b448 SHA-1: 5d6e652780ae44a217522fad70327acd0c335e7f SHA-256: 96681e77cf1744e52d28fc3dfee3a5580a7acaf13dc6614b2dbf16aea0e9aea4
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload directories and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of these links and the overall structure strongly indicate an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://coretry.ru/uplcv?utm_term=ml+aggarwal+class+7+solutions PDF link annotation
    • https://itracmediav5.com/ckfinder/userfiles/files/poxomirunazubulasuwaw.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e28fef06b9---53039208220.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5e122d4307---fibujuxegirupopuwebu.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1606e744c4fc8e---42233038381.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609bfc9b5a116---6163371926.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1f436ad5e---90036647572.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/gunizez.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607046b951ab0---3852145488.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac632c6a298---41794442781.pdfIn PDF document text
    • http://divorcefinance.nl/uploads//file/49616361363.pdfIn PDF document text
    • https://silga.ca/userfiles/file/xidisugem.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/82074067183.pdfIn PDF document text
    • http://henri-ruch.ch/doc_pub/file/gerubekizefi.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/52147124386.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/14704151439.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/218dbfb14c898558fd7b5c8e89a05817/67599769410.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/lafexewas.pdfIn PDF document text
    • https://net-mex.hu/ckfinder/userfiles/files/30263850582.pdfIn PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/77011439386.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/b1b0edae8bebb16b70b0089a314290c7/sidutumumukipixu.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/tavoberuwanumefupajepa.pdfIn PDF document text
    • http://win-sonic.com/kida2018/ck_imgs/files/51209992189.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/2lr0bvddktmk0po053oo2kv4mr/zuzewaf.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/ave907gppc2qfdcfv62bkandt6/11447947043.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/df68828fd1723cf570a08553a57a84b2/dowiximozanud.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_off0000c6e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E1 16132 bytes
SHA-256: 685a01383b4da2e92c24d7216f42f696ea28e817e42b2a3c6d3b99ef7174b020
font_01_sfnt_off0000f06d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06D 10504 bytes
SHA-256: 7e6c0ee8f79ea0756362242ff1a895c8c4bed374cf21025cc6a65e0ce7f5a91e
font_02_sfnt_off00010891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10891 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1