Malicious PDF — malware analysis report

Static analysis result for SHA-256 874e9b15b18d6dbc…

MALICIOUS

PDF

101.8 KB Created: 2021-07-01 19:03:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f9038e9d61224687c5b2939d7a164af7 SHA-1: 69f564a772a11e92ca476df5a347d2bc6e2bbf7f SHA-256: 874e9b15b18d6dbce4d64cd9fc0f7258162cd737fe3656391eec85e171500cba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of external URIs and link farm heuristics strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c3f54b85d---91831598210.pdf In PDF document text
    • http://agendaalzheimer.org/files/galeria/files/7752398759.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/bakevewivavifa.pdfIn PDF document text
    • http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/guziwoziriwaduvulora.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/1ec57f207628c72666acbc0df998bd72/5235986674.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608524ff52260---78291812083.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16087dd8d5a418---dubekomukipirop.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/pimololegasuk.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16093fdaca4fcb---89493949773.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/900971911d32912f771c2a06d6e0e594/zekuvu.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607132b48b8e0---25580259412.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-21/20210521161304711453.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878d5b5e374---7966992823.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/851af22a025c9accd6312ac13ed7c251/7326580489.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/5t971l1kpcqrmd3d7id01mq6p1/41920974336.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071e762e589b---753403684.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/norovibidudexuwugib.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607610f18e772---mujuwalilisesemo.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/64000819690.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/sevukudadi.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/sobolafemusakivusede.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d17a1c9a5f---taveradowasiwoguwekukuku.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/85964529547.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092322a7491b---gifupupas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=mass+effect+manual+downloadPDF 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_off00011c19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C19 10624 bytes
SHA-256: daddccc98b8fbf7c36ebe1d9a09a3fb6de275fb9693af4b1519c3368e5525e20
font_01_sfnt_off00013482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13482 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014c94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C94 23872 bytes
SHA-256: eedfdfda384dcca9160d6ff3b7a7d042be513bea8f4ffd5022ff4c15ef254033