Malicious PDF — malware analysis report

Static analysis result for SHA-256 de92ca161fcfc038…

MALICIOUS

PDF

86.5 KB Created: 2021-09-07 14:51:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8836be412efa7f61fc8c79445aa6e52b SHA-1: f9efd064be434cd1171d2027b17f0836096eb45b SHA-256: de92ca161fcfc03841c32c63c9c1cf2a36bde99805882ac2391e178cfcc46295
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, which in turn host other PDF files. This pattern suggests a link farm designed to obscure the ultimate destination, likely a phishing page or malware download. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/161335df52bc78---27234885107.pdf In PDF document text
    • https://tdfstore.it/file/25694530964.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/59j6n3ds298hg0ulc7egoferf6/julakuvedizodixibadujasus.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/sekobotifazuruxavifavik.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982e5bd6e34---41364544564.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c61e48c929b---lelexetibamaluf.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/ec13708460688b9f40eb0bced354fdc4/99205913546.pdfIn PDF document text
    • http://grandfiltr.com/files/file/39396143088.pdfIn PDF document text
    • https://cian.hr/userfiles/file/junegifexunakoluga.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160b79d7da8a42---zudiduvarebavokovegon.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/kovikim.pdfIn PDF document text
    • https://wineart.online/userfiles/file/vejajuf.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/4013248544.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/32c0de9c76a1e0c1d585029469fbd1aa/22325390258.pdfIn PDF document text
    • https://eric-parnes.com/ckfinder/userfiles/files/batim.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e8de5c466---mirawedafabibibadexode.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/56782598344.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f06cf63f51d---39185388234.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/sizowa.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/namebumawiferadebuv.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/39705278289.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/fexefilisoxinixum.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/85vt279ep0t4arli78m5hnn4o0/34543353473.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607808e5c914c---bofumuvaw.pdfIn PDF document text
    • https://premium-house.uz/images/file/wojawiwesakusezadazeji.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/90407726422.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=quimica+organica+combo+john+mcmurry+pdf+downloadPDF 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_off0000e1bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BF 21324 bytes
SHA-256: 3f56625311f782eb26212a26e1e25ac17145cdcb56322efbb8043f8b3501b6f7
font_01_sfnt_off00011a0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13226 11296 bytes
SHA-256: 89b1adadc239efade2e059c015d38dd22b661f39d1e5222c907d290357f77814