Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaef34520abfbc4a…

MALICIOUS

PDF

83.7 KB Created: 2021-09-04 03:53:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 61abf5758c2547ccba795ac6925d0456 SHA-1: dcf4a99ea089d0b1f5f10416ec32db47f2d33a62 SHA-256: eaef34520abfbc4ad25429ea5149f0ba5f913a92230e28608cf32c905fdc5c41
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URLs, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely a phishing or malware distribution scheme disguised as a download link. The embedded JavaScript is likely responsible for initiating the download or redirecting the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://krisoc.ru/uplcv?utm_term=marvel+comic+books+download+pdf PDF link annotation
    • https://primer-spb.ru/files/files/gamaresupojegiwiwedefobo.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/88791947876.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/31306371908.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/q4h2qjbb8hf57alg30b6knffjf/zimubopoxizur.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/vezolefereribefufekenamef.pdfIn PDF document text
    • https://wasael.com/userfiles/file/10466943867.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/m1n962ivfk8r9g9sk1g41au1l6/68498940869.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/552566431d87b45a0bc271ff8d32aa65/devazelofipawesaziwujidu.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9cc54f2e8f---kewozabozaneso.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff06926f1d---zemasakepajubadu.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/jewigisolu.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f0906d55632---vozavesukole.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/25802972797.pdfIn PDF document text
    • http://mengnuanua.com/app/webroot/files/files/22917621379.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16129dd359878b---mavifarat.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/95089309745.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/tizonesenixenubuma.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/dikusivufukakawojax.pdfIn PDF document text
    • https://derfo.info/resimler/files/pisonebe.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/a2d70858212b4576af6cb19f1b84909b/59047576764.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/b17184dd466597524686dc1a61e1d018/lonuguluwig.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/3a8712aa0ef7a165460dc5694a17407e/80890115064.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/7c1738fc7e31e41a4e933c24b5f5ecb1/ponolakilomepume.pdfIn PDF document text
    • http://mylodge-naoshima.com/61925678941.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_off0000e0a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A5 18004 bytes
SHA-256: 1e19cf8e0510278b24f42ddeb558e5688c780da79ba8cdb4d9a7ca8a58e52c35
font_01_sfnt_off00010f4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4F 11060 bytes
SHA-256: 5758be8f275c7113b4da90c8f24a74426d9b9612da6727b0975b915ea8933c5a
font_02_sfnt_off000128df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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