Malicious PDF — malware analysis report

Static analysis result for SHA-256 f265edda8393ba45…

MALICIOUS

PDF

89.5 KB Created: 2021-09-20 16:20:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b9b7f59f7a357c85f8e41fa433285d07 SHA-1: fe61734be7a97ee304883634790bd6cbffe60df3 SHA-256: f265edda8393ba458c095a923b32f35a92b34b820fdb4eade106e7caea4d832f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/15075917831.pdf In PDF document text
    • http://njboyuanchem.com/upload/files/momelozozejopobofoj.pdfIn PDF document text
    • http://cgpharma.in/cote_dor_import/admin/ckfinder/userfiles/files/34928149427.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/82133010126.pdfIn PDF document text
    • http://resurrection-life.net/userfiles/files/kuwesolesaden.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/66860939113.pdfIn PDF document text
    • http://vncdata.net/app/webroot/uploads/files/jovunufufevuxitebafi.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/2598262771.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/75363279326.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613ee6dd7c6a0---josoduvekes.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/wajedamowabazagaginadu.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16132cd63dd5f3---vefufugufatumaniwobufekit.pdfIn PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/75627303821.pdfIn PDF document text
    • https://path.mn/userfiles/files/mudiwenevodeko.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/jozukagunofiziz.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/25979690818.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/n5cnj57vfm5c16nqmoq3fthu75/birasova.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16134cec23c5dd---futujudabo.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16130c5547e2ac---18834011110.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/l08u7hth8uiqkb6rgnap43vi35/93586665292.pdfIn PDF document text
    • http://www.pacautomarketing.com/file/616962225.pdfIn PDF document text
    • https://arhstroi.by/uploads/files/neluniwekewavogenirenogof.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/nawopipexijetovul.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318df817eee---ruwomo.pdfIn PDF document text
    • https://millinerandassoc.com/files/file/33153059841.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=6+hats+strategyPDF 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_off0000f96e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96E 10208 bytes
SHA-256: 1694496089164d0d3ff890ac7a9682709c31cbb2c45e06d7e605774f6a5a47d4
font_01_sfnt_off00011089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11089 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001289b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1289B 18472 bytes
SHA-256: 2d5e40ff83ed448f7abdff2e78ab3ca3db9020a27bf7d4364cc1d0cd1c45939c