Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6434df1e8857668…

MALICIOUS

PDF

114.2 KB Created: 2021-07-22 23:25:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b4f571672219c1674da8411bb0efcf78 SHA-1: a9491069fcfe989bdb575a9f363b127c963cd061 SHA-256: b6434df1e88576684891dff5d4befbf1abdec68e61d685966377af8510f85509
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains a link farm with numerous URLs pointing to compromised WordPress upload storage, suggesting a phishing or malware distribution scheme. The PDF itself does not contain readable content, but its structure and embedded links indicate a malicious intent to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/4152c6a1ff69f0f6bbe41302a0f00cb2/60268285303.pdf In PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/80672799733.pdfIn PDF document text
    • http://gdwtechnology.com/fckeditor/file/zenujotedokojefulil.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/zifarebamomodebuv.pdfIn PDF document text
    • http://cpspcb.com/uploads/files/88406206142.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e2042fc6779---pokumunoderetadofuli.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/14290146255.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/063a0ab881ee58cbdbcd8080e552be1d/jozizupaxomaruga.pdfIn PDF document text
    • http://miltonhigh65.com/clients/874455/File/75453061205.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/68384518737.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/rapolujolewor.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/13747447656.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/kowofup.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d85b8269ea---nozutinakinuduletit.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a97ecae8ad0---zawukuveg.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c70a9d48aa3---40376114102.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084d90ca6820---10486300598.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/keruwosizufe.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/jokot.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/f319e9d10728a830fa9d4dd06c594b13/gogosudugekafowujenamu.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/c01a6c0e06db6d9fa3babd22f3524347/92803866607.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/34035532681.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/e2c99a99eacdd90a9c2e04db2f2d9c31/sebusexufi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=butter+saturated+fatPDF 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_off000157fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157FD 10136 bytes
SHA-256: d7de97c85bc1c8d168d08009489f6487298b73d120b5c92571a3b8b70577d494
font_01_sfnt_off00016ed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16ED1 19988 bytes
SHA-256: c4e97aa6ba1536a1787f160aa648f17a8b8485c08e588729add6337b6a7bd0ea
font_02_sfnt_off0001a2f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A2F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1