Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2943dc9ac426363…

MALICIOUS

PDF

78.4 KB Created: 2021-09-06 18:38:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1572a3eb47cb4450f2fa426ad221e69c SHA-1: bd7959b3d3ff90454c8ea8fadc98bf628ef7bbd8 SHA-256: d2943dc9ac42636367b61a3718c692c9e0cabca86ee0d8a8efb30d338cf450ea
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The embedded URLs and the nature of the heuristics strongly suggest this PDF is used as a lure, likely for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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=leica+stereo+microscope+manual PDF link annotation
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef56eee0af---waguromipilasimipu.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5ba8be343---sidugugedemubiratir.pdfIn PDF document text
    • https://lochoanggia.com/upload/files/lezoxorolabisajerututoxad.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608da6be7cb84---bimawelulubepum.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/99238285879.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/47470521226.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/b4none45u5vqpjge9p2ru5sa8b/toxagovupanadefezobudelu.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c94a4fa1f7a---3008862809.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/5ne2kpsgfb1ku89lrejklle4i9/50657632423.pdfIn PDF document text
    • http://prosquash.by/data/vesiragofonuji.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/xuteno.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/e0uda2cn6046f2ce1dbjk44tut/kolizabibobuduvozaju.pdfIn PDF document text
    • https://nocnepal.org.np/ckfinder/userfiles/files/76008520327.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/3qel4j10rr7i7uqc69g7c7r4g6/modolejoj.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/97a50c6e55c1ae218cca87258538842b/23154785478.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607be1486bbc0---65179899054.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed84bbb8088---senilapepawage.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609482039c9ca---64070325375.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/64056222240.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/96620205341.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/94796251815.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/aaa7875de1018927bedab274b752fead/xegamusuvixeb.pdfIn PDF document text
    • https://jf-orvalho.pt/userfiles/file/bexobazuv.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/07ee986d70e1ebcfeb09d26fcd67d091/gudabudewo.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/tegupevofavibiwitatoraxol.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_off0000cb16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE328 18240 bytes
SHA-256: 5a5791dfd87de9370a2271b85ce6f5e9e084b79379939d48685ea4b3d8d31445
font_02_sfnt_off00011263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11263 10592 bytes
SHA-256: 0af11c5825205e5c28ec7d29998c2f577801c0175f85e321a7cb1b5ca411ad9b

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