Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6c937647dd6b0eb…

MALICIOUS

PDF

69.8 KB Created: 2021-09-25 02:20:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 642f45d4ac64d66cea686a30c3f61cf2 SHA-1: e1dc654be023dcb3b24508641fdd6e5bb53b6b6a SHA-256: f6c937647dd6b0eb55b60ae16abba205d749ead738e976222c2375c8774e73f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised CMS platforms. The presence of embedded URLs and the overall structure suggest an attempt to lure users to potentially malicious sites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.casestilistas.es/ckfinder/userfiles/files/80026015382.pdf In PDF document text
    • http://vietdubai.com/userfiles/file/48103138409.pdfIn PDF document text
    • https://futurefacesmiami.com/uploads/file/64259714456.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/91873827340.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/kuwomuxepe.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/ideli446nqgtbcjnitelbp31jq/59068780165.pdfIn PDF document text
    • https://izyskately.ru/foto/ck/files/35087687254.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/73344974531.pdfIn PDF document text
    • https://gsm.company/ckfinder/userfiles/files/38214639170.pdfIn PDF document text
    • https://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/20028114857.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/gqksdnrl7itjl1gdmca3lvuve3/31560061032.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/7884320472.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/wepudaletaxaz.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/89201932855.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/29724120989.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/23207139294.pdfIn PDF document text
    • http://ms-krmelin.cz/app/webroot/files/files/sasedizunaw.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/98110889298.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1614e343137db7---fowatozobogid.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/brg6iv0km592knie9s9aerdtj7/76244343984.pdfIn PDF document text
    • https://eletroluz-al.com/_IMG/img_internas/file/6975991334.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161491a3ae47ea---nukixofusolufefedenuba.pdfIn PDF document text
    • http://kavernoklub.com/campannas/file/65469376626.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8a40b7f53---87144383212.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=10k+house+bloxburg+2+storyPDF 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_off0000b3c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3C3 14588 bytes
SHA-256: 2a4d46da8b1c37da270973485ce4cc8b1952c5b44eef0981fe56d8dea421f9cc
font_01_sfnt_off0000d87f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87F 10776 bytes
SHA-256: 7cffa507bcb50db993f9817348dcc332cadfba4d1cfbddb759fe02efe10e5910
font_02_sfnt_off0000f19a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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