Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6de976d3f233c3d…

MALICIOUS

PDF

140.3 KB Created: 2021-09-05 14:03:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 11c78e3a5213193c7c756e82e35543e0 SHA-1: e38b1def9d6627b24d8bb6fff1ab6a36ad7f68be SHA-256: c6de976d3f233c3d4499c2773e3af1790eb99b2573a29369828a10e52561886f
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads. No scripts were extracted, but the structure and URL analysis point to a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://smakbyala.com/ckfinder/userfiles/files/zowolujafajebozexorowaj.pdf In PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079948c90441---delunelemutama.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f96de7be7---18327541073.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/f961d46ef863cd606ddb63113a86561d/xonozawevovuganezewifitun.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/tumamapek.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/xudekasilidesoj.pdfIn PDF document text
    • http://samwha.com/upload/userfiles/file/verovukepinuleledajez.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/fifolowujinitulodamap.pdfIn PDF document text
    • http://korea-seals.com/ckfinder/userfiles/files/degatefazuk.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/16505985408.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/jijanizilovapatew.pdfIn PDF document text
    • http://hesexpo.com/img/editor/image/file/gumubadimiluwelajibazat.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/41033206370.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/f6j9kh3e0ql1tj2a6ck9223ekk/zogerexetega.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/eaf1bad6c8ce46e5cd8b23157975354c/90261784852.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/samiecvnfme5i8mfrsn0qjauhv/vetuz.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/tawelovogodagegox.pdfIn PDF document text
    • https://probidjp.com/ckfinder/userfiles/files/20210825_131053.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609469d1c1969---90805990049.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/52390884334.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ff745087550eb5d4c03766f0035efb8e/75154973654.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/ee888ed0210611944d8643d3397283e6/juzerovadebolazevaded.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=recourse+against+arbitral+award+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_off0001c4a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C4A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001dcb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DCB4 17056 bytes
SHA-256: 348f0dfc22df8cf09fba002be86707fdd4bd88a3c45cf7e5a53f3a56427321b5
font_02_sfnt_off0002091f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2091F 11168 bytes
SHA-256: 996360205e7987cb642e2cda13d883b519e32546c9ab5dd4f1a1283ca1a73a0b

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