Malicious PDF — malware analysis report

Static analysis result for SHA-256 448299742d70eaa3…

MALICIOUS

PDF

69.2 KB Created: 2021-10-04 06:33:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f8ef270871bbe4ec92d38150ac137c88 SHA-1: ebcfeb811d2c003636b0accac20deeb22f75ad7b SHA-256: 448299742d70eaa3e79ada343efd64b58f0b251e241353eb6c77705df16f97d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm containing numerous URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent beyond what the heuristics and URLs suggest.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://pecsikult.hu/files/file/wanos.pdf In PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/dbab59d0db8d462f931f9793e81875da/21809419685.pdfIn PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/86249504849.pdfIn PDF document text
    • http://sooclose.eu/upload/File/1826017672.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/58088919383.pdfIn PDF document text
    • https://yummyschool.com/_UploadFile/Images/file/dokujalomivolapobif.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16155ec320e1c2---10193304967.pdfIn PDF document text
    • http://strandedtattoo.info/file/30908182908.pdfIn PDF document text
    • https://korvioinfotech.com/ckfinder/userfiles/files/88165395057.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/niwebowuzopubeto.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef0d00574c---26126383434.pdfIn PDF document text
    • http://quinta.cl/upload/files/20544925906.pdfIn PDF document text
    • http://vouchertiket.com/airplane/ckeditor/uploads/files/20566028464.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/70210910010.pdfIn PDF document text
    • https://global-brand.net/userfiles/files/38580129061.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/29461428895.pdfIn PDF document text
    • https://kerryparsonsfoundation.org/media/file/ritamezekozixijepidov.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/vamiwopugirafojivofewixe.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161592906d1236---40017706860.pdfIn PDF document text
    • https://intersat.lv/files/file/57514839063.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/zerufofiwodunumoxivan.pdfIn PDF document text
    • https://zniczekowalczyk.com/user_images/file/xuwokebukoxiwamadew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=foster%27s+home+episodesPDF 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_off0000ae7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE7E 10356 bytes
SHA-256: d4e9d2d3bd86c136a60ad79ee842802d87107476d29fc986b18eb742adeaf8ec
font_01_sfnt_off0000c5e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ddf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF8 16372 bytes
SHA-256: cc5d9c84205be7c1428567bdf770356083e7c0ad6c3a8c4408cef49b36b17439