Malicious PDF — malware analysis report

Static analysis result for SHA-256 09581de015966b61…

MALICIOUS

PDF

84.9 KB Created: 2021-09-01 11:50:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 668c0e9a31736c926feec619e2461a90 SHA-1: 37b2f95ec36c2944565e382662df8428cb273edb SHA-256: 09581de015966b6123760ddf25666e87195b995a1eae51b7daf45c412f036efb
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute further malicious content or phish users. The embedded URLs, particularly those on compromised CMS uploads, are prioritized as IOCs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085517f34f6e---82375761376.pdf In PDF document text
    • http://preciz.com/uploads/wysiwyg/files/lalamotuxigijowivixivugax.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/s1j21bonrbdboq9s8n131edmqs/denimifamebagonoxakaj.pdfIn PDF document text
    • http://viethanit.vn/hinhanh/file/17457879786.pdfIn PDF document text
    • https://madeirashopping.com/userfiles/file/lefaliwogebodosafe.pdfIn PDF document text
    • http://princeverma.in/uploads/files/61913542683.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/53031188039.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/61404571275.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b310fff1498---22198655881.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160824afce4802---dabuxovofesadekopadelij.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a45718744b---xegakuwaberasunurorubul.pdfIn PDF document text
    • http://musik-fachberatung-neumarkt.de/images/uploadedimages/file/damosiwe.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160cc1ca2e742e---rawalajepunera.pdfIn PDF document text
    • https://handinhand-daycare.com/ckfinder/userfiles/files/dajojaxud.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/kugirufasosixokejel.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/aa4246203e52c5786c85407a26b3e2f2/32539083389.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/vobilagubatemojofebere.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/lusajojew.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2c6304bc8---suketubefi.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/j4ce1ga5ovpsfde31rnbdb8obj/nitunigazeba.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/wudimiwuzuragijavegido.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/13ab3eb5bc3d4d4289336600270feb55/vaporazakarubenoxupix.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/koninejaveropajogi.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/sewilipidurogani.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/pr6tblc3j8ibm2b0uocif96dr1/dulidazus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=cable+technician+interview+questions+and+answersPDF 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_off0000e5cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fde3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE3 11036 bytes
SHA-256: f5a6139851814c64558a4f668be405548248b5e8b6f83694b546ee54a5195038
font_02_sfnt_off00011758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11758 17632 bytes
SHA-256: f47140ab53593f335aa59266c0dfeca1a1ed71ce051aefd6565e667fa34b5114