Malicious PDF — malware analysis report

Static analysis result for SHA-256 1663a24573c919f2…

MALICIOUS

PDF

80.6 KB Created: 2021-09-13 17:57:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a745c499ccc62766cc59ebdfef5140ee SHA-1: c109df69d1d1acd2b1b52e6399046a14e78ac33d SHA-256: 1663a24573c919f284ccd8a9c5969af92453584412d66febf0ebfa01d2a75c24
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised or disposable hosting sites, suggesting an attempt to distribute malicious content or conduct phishing. The PDF's structure and embedded links are indicative of a spearphishing attachment, designed to redirect users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/11416963280.pdf In PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138cfe7eaa3c---32385103100.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/povevide.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/7ff85866ebe706865655cdb3de291d6e/39715291658.pdfIn PDF document text
    • https://hobbyschuurtje-webwinkel.be/images/userfiles/file/70121350243.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/xejametogexirip.pdfIn PDF document text
    • http://xageunion.com/userfiles/file/gitogotenixosox.pdfIn PDF document text
    • https://buyafranchise.org/files/files/79191814581.pdfIn PDF document text
    • http://gpkoaee.ru/ckfinder/userfiles/files/44221235932.pdfIn PDF document text
    • http://iuf.kr/pds_down/files/woxegefaduganax.pdfIn PDF document text
    • https://iqrainternationalschool.org/_assets/files/9703123124.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/b75eb2b46bb8b151d590a66bc8201fff/vomoker.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/75587525140.pdfIn PDF document text
    • http://ckud.handysociality.com/upload/files/5554309217.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/61224871101.pdfIn PDF document text
    • http://www.hausbaumesse.at/ckfinder/userfiles/files/jonomawopusodoralojob.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613f0452b1e5f---pejanaxe.pdfIn PDF document text
    • https://optical-axis.com/uploads/files/202109072202545369.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/70543294196.pdfIn PDF document text
    • http://potentialdesign.cn/userfiles/file/1631380010.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/pejizifizapudikejufafemi.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613045035dc65---56032081272.pdfIn PDF document text
    • http://koutingchina.com/upload/files/jajubaxesofugu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=bengali+books+online+free+readingPDF 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_off0000d691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD691 17480 bytes
SHA-256: 40cf0ab388c4790c910eafcb2e055e5020b8e46847e18cc9a4324affa9a34c90
font_01_sfnt_off000103e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BFE 10716 bytes
SHA-256: 4b2ecbd9a3f167eb5f9fe1d9245b1fd6fbc44c86962446e6021f2c64d4a8a783