Malicious PDF — malware analysis report

Static analysis result for SHA-256 caac454772398531…

MALICIOUS

PDF

137.1 KB Created: 2021-09-05 09:16:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4752af14c6d85300eaff0c2ea146d9cd SHA-1: 3bbf87aae1f035d9e6d1b8aa03636fd4aba85ebf SHA-256: caac45477239853153d627cc306281033e768a65bc4f3ff4671b32f02d7991f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the nature of the link farm suggests an intent to redirect users to malicious or phishing sites, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://dailitara.lt/bites/uploads/file/sinifutoliwoganijawexazab.pdf In PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/d8d8ad944ec6e6fe730c21380cdad517/69455156545.pdfIn PDF document text
    • http://novichiha.ru/pic/file/43409686288.pdfIn PDF document text
    • http://jshanwoo.com/ckfinder/userfiles/files/71186407497.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/ae1449d66e78f3690e32c2d83b84789f/bireliserow.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b08e27051ea---20461295504.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-6-13/20210613041658368229.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/64181365410.pdfIn PDF document text
    • http://printrun.nl/userfiles/files/fewuke.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/jawegovul.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/58593925943.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16071a5f6414d5---gorowi.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aab388ae5bd---51060434544.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c29f3c3bc63---97372660287.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/37689192415.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/ppn924jjrd68fooksv4gvchtu4/76417715189.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/52505652462.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/mizulagoragidemupix.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/nosetoludidikesigalo.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/judajegerizulotositiben.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/24662790981.pdfIn PDF document text
    • http://gelateriacool.it/userfiles/files/ripetebezazezuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=concept+of+disease+causation+pdfPDF 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_off0001b2c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B2C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001cadb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CADB 10596 bytes
SHA-256: 0a835c48ca4255aa975f6514a7b52aebf46feaf23fa849db1e573dfab19e799b
font_02_sfnt_off0001e338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E338 19456 bytes
SHA-256: a298cf126743c5d51d9dfe2cd99482af18d377023657e7d38a3600b2e05a531d

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