Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd4d18c891c91bc6…

MALICIOUS

PDF

82.7 KB Created: 2021-08-18 02:26:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1485422bfa30962e793f216174ba485e SHA-1: 292dd9d9eab485372fe5784992812d94d202b63d SHA-256: dd4d18c891c91bc6114db08014214a0514ac684246e4da6fd3213a59f845f047
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to compromised WordPress sites and other domains hosting PDF files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or SEO poisoning. The embedded links suggest an attempt to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://coretry.ru/uplcv?utm_term=what+is+the+symbolism+of+the+mad+dog+in+to+kill+a+mockingbird PDF link annotation
    • http://primaneighbors.com/userimages/nananonimubilabaxikel.pdfIn PDF document text
    • http://cuadepthanglong.com/images/ckeditor/files/94249850164.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/nesalokaberawebuxemuvab.pdfIn PDF document text
    • https://mimpishio2.net/contents//files/96423110604.pdfIn PDF document text
    • https://alhurwallpaper.com/Files/files/51125738917.pdfIn PDF document text
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/93efkdjkld3ot7ntji5nubb74g/zowenabemomijumuzajero.pdfIn PDF document text
    • http://csc-0898.com/userfiles/file/20210720104905_i1hb19.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3a4819bce---diloxonativaxisisonefil.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/ae8d05224ebdfc256f72bd9c56ce601c/dakofazifarewivaverit.pdfIn PDF document text
    • http://muaah.ca/userfiles/files/50095446299.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/tobakulanogerir.pdfIn PDF document text
    • http://anandamsanyal.com/userfiles/file/xanugumulotidu.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/gufasaburozetoxameridakix.pdfIn PDF document text
    • https://rivnerun.club/images/files/1380016314.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce4da0dd27d---nebazadogu.pdfIn PDF document text
    • http://anadolumatbaa42.com/genelresimler/file/buleme.pdfIn PDF document text
    • https://hiroyoung.com/data/files/leketikuwekefan.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/cc58b75b6bef97bd2131a4e9eb3b80e6/96742301919.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a22cb67e02c---67010319911.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/jexodazuwolu.pdfIn PDF document text
    • https://mmszke.hu/files/file/31331174974.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/90418509589.pdfIn PDF document text
    • https://www.natursany.com//ckfinder/userfiles/files/19773691637.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/b6747315e1a4b81ee6f5d92deb25a8ce/19296442423.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d475958ff7b---soremoluro.pdfIn PDF document text
    • 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_off0000ded0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED0 11260 bytes
SHA-256: 0a2e12de6202705554ce5bd45c38d7c4beafefbaf7a5a6cd7857e01660382d9b
font_01_sfnt_off0000f8dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DD 17020 bytes
SHA-256: a3c04ff5c318102c8a6ab6187780de86a7a0ecb7bcc890fd7c148a835592b6f0
font_02_sfnt_off00012471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12471 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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