Malicious PDF — malware analysis report

Static analysis result for SHA-256 dde92451d48198e2…

MALICIOUS

PDF

86.2 KB Created: 2021-07-27 06:55:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d1e96a3d06ef8504c7a717bd813cc2c2 SHA-1: 80cd19ba3c2461420257d293170ae781ad09d2ed SHA-256: dde92451d48198e2f88a7c29fd3c7fb5733bf5c3a8a6785a5b097a93865cc526
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised CMS upload directories and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are consistent with attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://ed-web.cz/userfilesfile/litijoxevuxalad.pdf In PDF document text
    • http://exoticland.bg/upload/files/files/detojoziwalofipow.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090825f3c288---33552417641.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/wudemijufukeke.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/7b2ds8upoe8up285gsrg94doi2/63664794020.pdfIn PDF document text
    • https://duvanco.be/docs/files/pofigod.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/60204838466.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089f1c1d5922---levuzuruvenezuponubok.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/4448229955.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/27410460643.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160926a691b0a7---metulunaridinaferasawub.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608929dc1ab6f---sakotijupujukom.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/lototuzalepexobosik.pdfIn PDF document text
    • http://feniks9.ru/ckfinder/userfiles/files/jufibutexud.pdfIn PDF document text
    • http://hopkins1983.com/clients/861771/File/rifarisetaretavis.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/wosetaxelimobetobag.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6483254c5---86679025819.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/7h4iaj9do9pt6atq1d8snsp5m1/tejabugovolaxusobadivigix.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210703_8CC086C51BABDC5C.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ee36d2460d8---dedadovajolagese.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/88688146245.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a73cec3e585---telarumerepalizesur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=qual+a+chance+de+ganhar+no+bolao+da+mega+senaPDF 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_off0000e9f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F1 18348 bytes
SHA-256: e4e44481c3612f2b93e6cd3d059fbc87bd13a9e893b642d9cc5961948b3d7bdd
font_01_sfnt_off00011769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11769 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F80 10924 bytes
SHA-256: f185ef0b9651616110589f732a4fcc7c9ec3c823a88ee235317c087dd65fbb03

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