Malicious PDF — malware analysis report

Static analysis result for SHA-256 335fc49c2beb4e39…

MALICIOUS

PDF

82.8 KB Created: 2021-08-23 11:48:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 93f68ce49d5e481f62c42644e9f2fe80 SHA-1: 4a0baee6e4bc5e770980c6220563d96cb883a38e SHA-256: 335fc49c2beb4e394ef402e02f2b9d0f5c37a766e37624927830d18195de12a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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://ppuhperspektywa.pl/files/edytor/file/79236776555.pdf In PDF document text
    • http://potya.com/latera.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161115c9ddff4f---togisugapariwogevinojejop.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160abfa2b8ff96---22166863703.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/rodenofesolixopoda.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/eukimns4i6879nih0n269ap32o/79276500306.pdfIn PDF document text
    • http://gutachterbewertung.de/userfiles/file/90018028217.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/soxokajosijuw.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/rekipibugugati.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/fb26e119e545e3aca1ed9619e65e3179/14903880999.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/bopopadubovavatepoxuv.pdfIn PDF document text
    • http://zeci.nl/im/image/divovetuzufilagem.pdfIn PDF document text
    • http://tylerdaynursery.org/clients/8/8e/8ed7c4ff1d995b028c1180c1bccb3f4a/File/nejefir.pdfIn PDF document text
    • https://stopserv.ru/files/file/wumajijiwadaforidel.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/25742909174.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/fvr6ef458oq81l4ph16houu0ql/45052713463.pdfIn PDF document text
    • https://ecole-anglais.com/upload/files/tamipewomu.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/3176554587.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/gezurewo.pdfIn PDF document text
    • http://esistore.be/userfiles/file/ramugewipalad.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/vazijapewezunolame.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d00ce505b---nojoxokurenemegesukokeba.pdfIn PDF document text
    • http://rford67613.com/clients/a/a2/a20594cba7d6fe247bc87ef9b80620db/File/balirivelobutifoxixu.pdfIn PDF document text
    • http://rurisnet.org/images/file/50661557920.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+find+the+turning+point+of+a+curve+using+differentiationPDF 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_off0000df0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0E 16756 bytes
SHA-256: 01847b8eaa87b6df9b23d3884a8ced311d792cefbafca84bc6b08c1f21185a2e
font_01_sfnt_off00010a92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A92 11096 bytes
SHA-256: 64dd2fac1c359f9c84daa0b0563b283d6f29820f3a71c493adaf4254cc31a0ca
font_02_sfnt_off00012433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12433 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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