Malicious PDF — malware analysis report

Static analysis result for SHA-256 b551bff6338fc0b0…

MALICIOUS

PDF

75.3 KB Created: 2021-08-29 16:35:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 570fe559e8a0c1360761ddf62930c51e SHA-1: 36583f6fba309bcf77bfc7824174cc0a6b2d39fe SHA-256: b551bff6338fc0b0ed9257f3aa3a62811de1dda1e6785f2a7fc5a891f9d774cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious or phishing content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/n7q7qhinvtt9rfqvi19r1k228d/bavawenadiduruwobon.pdf In PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160729821a5fc6---68201711288.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/20592544337.pdfIn PDF document text
    • http://ecolservizinettuno.com/userfiles/files/vajaniga.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/28177156561.pdfIn PDF document text
    • https://fuoriscena.eu/file/5537021952.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/d8bad822971c72e0fc6a66ed95d2c220/47484336416.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/190tf3rp63j6vvjc9ihuse9iv3/sexanub.pdfIn PDF document text
    • http://danfilenemd.com/clients/67744/File/sogenukanigiwosiwufe.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/2b54d71479a5d841e9a3adc449735b1d/xilurogeserijizedemoni.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/qv1irb606r155rd7lvi929ndnh/94542414569.pdfIn PDF document text
    • http://luvnchrlysenglishtoys.com/clients/861429/File/nifubule.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/d1ea39b20a03a07288aa4e205d3919e5/katimofokalazuk.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/uumrq96st8s5die4euc2tkvf97/16310110858.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/84566083824.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071eff444d3d---39476244158.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/94908055497.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/60860003146.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/ohj70lughv8cqq11vbk09rr28m/kusuxujaluva.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e170dc810c---zudolabepinefupidujuz.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160898b36dd0f1---41893610600.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ce9e39059---kalurile.pdfIn PDF document text
    • http://ehs1958.org/clients/73155/File/49146748125.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/92795081017.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=personal+weaknesses+swot+analysisPDF 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_off0000cb13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e32a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32A 10392 bytes
SHA-256: c6749e73dbde070e903cabbe9441380ff7241184be014fe974538e7b1e46ecef
font_02_sfnt_off0000faea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEA 14656 bytes
SHA-256: 83213c09c253fec7f9df03369d8f9e0cc3127683c7beb5b6aa29e0465b0b3096

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