Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e499cfc4699e3b2…

MALICIOUS

PDF

80.9 KB Created: 2021-09-03 00:08:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bb36ecd120fff66cb73b684e42d50488 SHA-1: 24f8403178642133af2f223421e5c61dc6945093 SHA-256: 2e499cfc4699e3b2805ca505ccf4c77531fdb86a1a110829910805a3d2de1f28
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect the user to malicious content, likely exploiting a PDF vulnerability or social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/04njc1g6866dro2oe6p7acfe8t/68454754034.pdf In PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/2h99s42b6bjeajh44501te08g6/butigenutofavomezovob.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607dac702b446---68667661756.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/23349005484.pdfIn PDF document text
    • http://ge-mak.com/files/texijeja.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1608032b1a2c6d---sijosufifimu.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/db0ecebea24040354741b52179bb471b/roxiwefekijomunaxu.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfe28aa966e---87472246127.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd24e677af---favesugagavekameteka.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/8060a022687c2ad3791ceb5e8da6fa12/kexul.pdfIn PDF document text
    • http://ttfi.org/app/webroot/userfiles/file/kuzivesi.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/vubafal.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a545b1d3eac---tasaxutiwalegurenuzete.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/50dh0tiihpdmmasp4jf9ffuhpb/jekuwuna.pdfIn PDF document text
    • http://computerdoki.hu/user/file/damugipinibaferevewugegup.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/3088316776.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/lizer.pdfIn PDF document text
    • https://eijo.in/ckfinder/userfiles/files/lapinizatazatepupuxagune.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/meferob.pdfIn PDF document text
    • http://dulichgiahy.com/upload/file/morofilawalu.pdfIn PDF document text
    • https://vv-alc.nl/uploads/files/rimuvowewubadojokimupoje.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/85375705231.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16072214ae03cc---34236737839.pdfIn PDF document text
    • http://phutungotodungha.com/img/files/28794998335.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=fisiologia+do+sistema+respiratorio+animal+pdfPDF 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_off0000d6be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BE 10816 bytes
SHA-256: 00d92dae9f6fb9c2a23076bf273fcc807b35079d9a8e9787c30ec96f0b74c4a5
font_01_sfnt_off0000ef6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6D 17940 bytes
SHA-256: 9c1d989d216a3b6dc784de022aea8d6461fee93f3a17e1e9fa3bdbf17f2647cb
font_02_sfnt_off00011dbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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