Malicious PDF — malware analysis report

Static analysis result for SHA-256 f900042a775dfcbf…

MALICIOUS

PDF

76.4 KB Created: 2021-08-11 19:58:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 88bec2b92ce474f7ca53d9c06f9f2454 SHA-1: 4872ee40a5e5e8fdd06be217ac231a85dc25ded3 SHA-256: f900042a775dfcbff2c814e2631a72e8fc435efb00663ac675cb43b1aef2560d
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of these link farms on potentially compromised sites indicates an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b56f82324---41119705785.pdf In PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/33ff769fe1efed8438449bf8ec1faaa4/likivosikodar.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/tulerakelufigud.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/35759772635.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/794mbmqbo9l07akjpcf31uhqk8/13366816212.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fff039519---wenipupajiwubebavonajudo.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/90208854719.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/o43ts9nddc2qqthcjdhsdmruc1/domavafarajodofa.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/fa88a260f50c2aadc7230477006310b2/vufinosobuvizujipejafage.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/befogivunivitig.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/42568522090.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/ede8ccf967135bf9edde3e6998b801cf/zelofazol.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/05/file/202105230643565861.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/53968673033.pdfIn PDF document text
    • https://progin.swiss/ckfinder/userfiles/files/pofulesebubebuperivigo.pdfIn PDF document text
    • http://charontrade.hu/data/file/kalovesuniwuvuw.pdfIn PDF document text
    • https://derey.nl/app/webroot/files/userfiles/files/73361275276.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746db04bdfb---74862656233.pdfIn PDF document text
    • https://seikico.net/img-tym/files/24847567024.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/551493b9c43c2ea589ef500b0a7eabb5/sosabotivotanifi.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098fefdd8c6e---2465084924.pdfIn PDF document text
    • https://bbdirect.com/ckfinder/userfiles/files/zupixoxarejamoritin.pdfIn PDF document text
    • http://cloverpark1961.com/clients/6/6a/6a73a08bb68f643008adb5efbbb44e43/File/67444013424.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=what+is+a+non+literal+meaningPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/bimuvifugezuxuvug.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_off0000c773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC773 10548 bytes
SHA-256: 3d8667945832586232dba852f0ad9deea5b4d33bb0548fdd4a0e815268daa506
font_01_sfnt_off0000df56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF56 16756 bytes
SHA-256: 9eda3dd96ad6ad75defa8b6b8cf4977d51a63032c6401a048eeb8f6cfd1e2904
font_02_sfnt_off00010aaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1