Malicious PDF — malware analysis report

Static analysis result for SHA-256 38721b8b0a3a43f8…

MALICIOUS

PDF

81.8 KB Created: 2021-09-14 02:24:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3d0a99c1d24bdb865fb12f44e3642f36 SHA-1: 37e8088a457e1c7e6922b16c38eccfdb5f440c0e SHA-256: 38721b8b0a3a43f83369dc4886026bb81b1bb1b16bb4c7e450708709f07d1d26
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and link farm heuristics points towards 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://garglob.ru/uplcv?utm_term=gba+multiplayer+android PDF link annotation
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/81463680413.pdfIn PDF document text
    • http://www.depomatrial.com/file/raxuxulakibijek.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/18018609754.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/jukoxowamijobusopadugope.pdfIn PDF document text
    • https://kurashi-kyoiku.com/cms/dat/upimg/file/vamopomipivasugozek.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16134e9bc5795c---38884069898.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/20219111116556444.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/acb1bbec2a781a95e25da7af975879c8/guxebimixabunof.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/98539616952.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/tovegoga.pdfIn PDF document text
    • http://newworldss.com/uploads/file/78560304079.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/wexifowuk.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/39200010219.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/zatadeba.pdfIn PDF document text
    • https://turasmobilya.com/img/editor/image/file/58402879231.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/99mi5tifuauc21a5o2d8cp9i24/zedapenewalefumekizasor.pdfIn PDF document text
    • https://moyaexpresss.com/ckfinder/userfiles/files/rapikerivonilokit.pdfIn PDF document text
    • https://dm288.rs/slicice/file/88488769215.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/velakotituzejeluxaveb.pdfIn PDF document text
    • http://berbun.com/user_img/file/53981865239.pdfIn PDF document text
    • http://atletika-pardubice.cz/files/file/talegijenalobamejotabuso.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/89422909397.pdfIn PDF document text
    • https://alyosserspneed.com/userfiles/files/73605080434.pdfIn PDF document text
    • https://pamukoglu.com/userfiles/file/jivenelaropawetemizonanud.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/40bsm64qaq7e6i404b1njdb051/lekeropa.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_off0000d82e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82E 18988 bytes
SHA-256: 17c5422d868da2733cf5e7962a079e76273715094abe532fde8b461015a50359
font_01_sfnt_off0001091f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1091F 10776 bytes
SHA-256: d5d0616207e86dfea1a8f2c9e0d81e8de510936d4349bef6c7ab72cb70e8d1e9
font_02_sfnt_off000121b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1