Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c2a017bc6043ad4…

MALICIOUS

PDF

76.1 KB Created: 2021-08-31 00:47:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a42d6d093852345d53496c56461e3cde SHA-1: 5f128b01eee45b3464de375bf56df09e7af139d5 SHA-256: 4c2a017bc6043ad47dcfbf4bacae598f6510d1f234721b36d8cc301722e5ab50
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs that point to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lure victims to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/ca8ba5dd8f63eaceae08b70110c50139/5192062240.pdf In PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/gezubaxivopinuf.pdfIn PDF document text
    • https://sabunwangi.com/contents/files/nalefolasadizukizawim.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16128bd8ac9ca5---gebonafonajamazobe.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/1d4d6bb4e2afe6a00c53863ef9d611f1/zujemerojaxotopepikumip.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b1331df08d4---57772399725.pdfIn PDF document text
    • https://mimpishio1bet.com/contents/files/9251538772.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/kuwagujop.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/69d1c1601f11189f3da7ff91d59b316c/53405904321.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/17vu15thduqpiabvs6777cu518/detaminiwemesugigiwovomo.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/39426385094.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c79719c3225---lalodoj.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/13256683139.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/83eb2adc5d3ca6b6d1a32d0b3a8c7b3b/dopibojesuberoz.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160735e500097d---gufukegawit.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/19586654007.pdfIn PDF document text
    • http://livilgirls.com/files/77044770347.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/77158041838.pdfIn PDF document text
    • http://hoachathoanggia.com/userfiles/file/13432115392.pdfIn PDF document text
    • http://yjccnc.com/upload/files/kenuban.pdfIn PDF document text
    • https://neksav.com/upload/ckfinder/files/49732249296.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/mofopugebikigiro.pdfIn PDF document text
    • https://inks.bg/userfiles/file/33250953171.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/635065368.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c57ee8e02ce---bojoxegevopi.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/68648434937.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=the+dear+departed+question+answerPDF 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_off0000c80c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC80C 10736 bytes
SHA-256: 8038e3f8ff8b67ae44ec07cf5f70d123e7bc96eabd7192421227f16706912314
font_01_sfnt_off0000e080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE080 16680 bytes
SHA-256: 6ed177037f4aaff6dd30051821683bb64361dcf584acccfad8a69d9b596b2541
font_02_sfnt_off00010ae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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