Malicious PDF — malware analysis report

Static analysis result for SHA-256 48e533c1fe145ede…

MALICIOUS

PDF

80.4 KB Created: 2021-09-11 06:10:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 573c218a717d5105f3c1864709922727 SHA-1: 440f1c92d0b4c63f3489108b139136e7f65ac33e SHA-256: 48e533c1fe145edeedf3669ba35b7a782ea3aa426bff9cffbd52460e80a6ddf2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crysiq.ru/uplcv?utm_term=navegador+gps+sin+internet+android+gratis PDF link annotation
    • http://dr-onesrl.com/userfiles/files/97966674581.pdfIn PDF document text
    • http://jawarakreasi.com/file/97990129607.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/99952461086.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/38293134539.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af9eb21298---70029079057.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16136352916ee1---nulaxovigarad.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210905_7ADE2741563C51F4.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/tuvesoluzozagexifumirem.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/jofesirezukesoletu.pdfIn PDF document text
    • http://tavio.su/files/file/javotukajusofasisolok.pdfIn PDF document text
    • http://caramelitos.sk/files/90457685122.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/67870119797.pdfIn PDF document text
    • http://eluvial.com/sites/all/sites/eluvial.com/files/sodonovuz.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/vamopakikurevo.pdfIn PDF document text
    • http://xn--z92bzy85x.com/userData/board/file/sodifoguwu.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/f643ca7d1528ec5d5d731c128c528b4b/37512898051.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138f8e702429---39710544509.pdfIn PDF document text
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/bedojusu.pdfIn PDF document text
    • https://phukienbep.net/media/files/66920189892.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/1844767084.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/9o3sp55e0e7hreqvq5afq9saf0/labelibaluj.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/fiwikuxezaxunojunewimefu.pdfIn PDF document text
    • http://onlytech-tunisie.com/userfiles/file/puxuxutetesakekosenixerar.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/mudedakubobusuvajuvis.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/tatasakegeweduxizuwu.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_off0000d384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD384 10564 bytes
SHA-256: 50924046ddea5d2682fd10d74ffd52170ac4006db425a3526cd3d5ec9385f13d
font_01_sfnt_off0000eb84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB84 17804 bytes
SHA-256: 6d23490ca7619b9f71619bec835223f1e2f06f823606bae756c5753d42089c5e
font_02_sfnt_off000119b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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