Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4876cdbac36b448…

MALICIOUS

PDF

74.0 KB Created: 2021-09-23 11:15:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ce956ced82098197a9e7efe3849e20b1 SHA-1: 0b90fbae46a7d297339d50e267ee97c89eab0202 SHA-256: c4876cdbac36b44868955966464cdf9bdc56eeedd3dc71e981dbdf7bde4c418b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm strategy. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or redirecting users to malicious content. The file's structure and URL distribution suggest it's designed to obscure the true destination and potentially leverage compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://apra.pl/files/file/4300214984.pdf In PDF document text
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/penaxunabololugedalaseval.pdfIn PDF document text
    • https://mmszke.hu/files/file/vefabuto.pdfIn PDF document text
    • http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/nubafamikititete.pdfIn PDF document text
    • https://ijacr.net/assets_admin/ckfinder/core/connector/php/uploads/files/xojojuxal.pdfIn PDF document text
    • http://epmachine.ru/d/files/55358533015.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/tiduwedarun.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/161489f9b58a2a---nijogovuvitowobinigub.pdfIn PDF document text
    • https://divetechmarine.com/contents/files/364432074.pdfIn PDF document text
    • http://lamgi.pl/ckfinder/userfiles/files/zewopelefafefuja.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/161424c833998c---89394549830.pdfIn PDF document text
    • http://darangyi.com/userData/board/file/34478385760.pdfIn PDF document text
    • http://aajude.pt/backoffice/ckfinder/userfiles/files/lazilemedakanu.pdfIn PDF document text
    • http://pandoraecza.com/genelresimler/file/baxafelaxagun.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16137185b854c6---diveku.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/vazarumurinipesas.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/3427747b1765b3ddcddb2e98e90247d7/zivogixupiluzanup.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/kizalimisegobuxubonokunoz.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/87195648531.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/bexagive.pdfIn PDF document text
    • http://www.sname.org.tw/sname/ckfinder/userfiles/files/megejiwumigaxagojazuv.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/23799673562.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/xomejolalujapokibiwegane.pdfIn PDF document text
    • https://vilus.cz/userfiles/file/robuzuj.pdfIn PDF document text
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/lupezawep.pdfIn PDF document text
    • http://weddingdove.tw/uploads/files/202109180103095300.pdfIn PDF document text
    • http://keralatravelpath.com/uploads/file/13263648476.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=lean+six+sigma+pocket+toolbook+ebookPDF 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_off0000bf06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF06 16612 bytes
SHA-256: 77e3b1d1256cbb409c093e4dc5ba1314bf46745625f6e41848c96d277be87dce
font_01_sfnt_off0000e964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE964 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001017b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017B 10908 bytes
SHA-256: 6cdd9e765af7296ba5ee2eaec84a0e533ca2c5689ff64c4a8f6b10acbb9e0f6f

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