Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bfffe4d46ba668b…

MALICIOUS

PDF

83.0 KB Created: 2021-08-16 14:27:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 761339a6bf9c0cae4d1fce43f1202e69 SHA-1: e913a5c062738509cb525dc778d2749ba496cce5 SHA-256: 3bfffe4d46ba668b21352ff5b90d2ad985a2c1f9ae5593dbf4cbdd3f2053758d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to distribute further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e6105954a---ziguz.pdf In PDF document text
    • http://phanmemerp.vn/attachment/files/79595923278.pdfIn PDF document text
    • http://deccanquest.com/konadnew/userfiles/file/29090543410.pdfIn PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/95788388661.pdfIn PDF document text
    • http://sns.hu/_user/file/27662443545.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/3o727cb3enqvdcne790g8ecm3v/denimoletizubu.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/tonun.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109d6a6114ad---bugixejenenomefomisubal.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/79298499999.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/daxuzesutute.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b881204c3af---lizuwezajudetoxuf.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021071810380173499.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7716cff08---2818289979.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/jufavevumesamejofelizet.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/210802014851565586resvc.pdfIn PDF document text
    • https://mabuksusu.com/contents//files/jowuzekakujogiw.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610ef0351c028---bopugikuwat.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/76000517264.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/62122866815.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/261tmvvg8s2kakvuuvnf141j13/59704488484.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f1aa9256100---54459451900.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/v7p0ces2ags0bjdtdcifin931c/23639294147.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=ejercicios+resueltos+de+estadistica+tabla+de+frecuencias+para+datos+no+agrupadosPDF 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_off0000dd7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7F 17508 bytes
SHA-256: e69463edbe41def5199d5287a1e167a96029065bdf0f406a939a0929a026a368
font_01_sfnt_off00010884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10884 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001209b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1209B 11148 bytes
SHA-256: 3489870dbf73d4bb2a945910b5a0678bd0878b5e95784f5276be41f19c8b5e26

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