Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e1926709ce27788…

MALICIOUS

PDF

80.6 KB Created: 2021-09-17 03:21:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 130ee1d2859b7de8dc7a365163818104 SHA-1: 035b062a428e23e404cd6773142eb947a7056c4d SHA-256: 7e1926709ce27788fb9dc940e4187e2474cf8df656ea2cfc9bb0e0f413c31e8d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. The document also features a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting an attempt to distribute further malicious content or phish for information. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://matchonusa.com/uploads/files/96122687945.pdf In PDF document text
    • http://kondicionery-lobnya.ru/upload_picture/file/fezuximizigenesasuwawejo.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/13597443862.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/c139aacde5ec3817fb7e1548b93139b8/16259598079.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/44651161886.pdfIn PDF document text
    • http://villaroyalenews.com/userimages/35693075174.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc10b43778---88047183725.pdfIn PDF document text
    • http://cuathepvangohaiduong.com/images/ckeditor/files/5882096636.pdfIn PDF document text
    • https://tjpapigroup3.com/contents/files/zetonavozulug.pdfIn PDF document text
    • http://revize-elektro.info/UserFiles/File/lijijesanijer.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/5vnrmst9928ijnqqr0jbiv46ec/butijegikadopilu.pdfIn PDF document text
    • http://ldkxzzs.com/images/userfiles/file/61994342892.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zevubotanaw.pdfIn PDF document text
    • http://www.horakgolf.cz/ckfinder/userfiles/files/kominimidegubofoja.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/63269310826.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/955ec5a77ad475d503a4543bdec683db/lefep.pdfIn PDF document text
    • http://bioaec.com/userfiles/files/91698390114.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/69636504920.pdfIn PDF document text
    • http://sozopolihills.com/userfiles/file/tiguxonedemuwi.pdfIn PDF document text
    • http://aurastaffing.es/upload/file/48009644299.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/86843410406.pdfIn PDF document text
    • http://findacommodity.com/upload/file/pixexamugorufomesawijokor.pdfIn PDF document text
    • http://modero.vn/upload/files/91693180055.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=khalnayak+movie+full+hd+downloadPDF 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_off0000d75d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75D 17296 bytes
SHA-256: aa91375691fb2c70e0ebdbfcc9eb90ec916717eedc5a9c355c061e166f6a03f8
font_01_sfnt_off0001040e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040E 10704 bytes
SHA-256: 434ef8725fbb74184f65d1033dee334cd24c802a01d4ae27c267b3ef65698d78
font_02_sfnt_off00011c6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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