Malicious PDF — malware analysis report

Static analysis result for SHA-256 c95c00f527407cd8…

MALICIOUS

PDF

77.3 KB Created: 2021-09-22 20:38:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8f15b646b72b64f180b521c0f7de20eb SHA-1: c6769ca6db82b019e821bb5211ea74ce8a04152e SHA-256: c95c00f527407cd89c5ac94a658b67208c1e58b02a57d72fc18c8f8d2c7d1e36
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS upload storage, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://pixomot.ru/uplcv?utm_term=rhapsody+of+realities+bible+pdf PDF link annotation
    • http://baocaosuhoatoc.com/luutru/files/46399348139.pdfIn PDF document text
    • http://marketingnews.fr/images/file/78493347800.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/medesunudotoridune.pdfIn PDF document text
    • https://znalac.com/userfiles/file/79375362187.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/xidapufupulumupidabasav.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/4521927388.pdfIn PDF document text
    • http://planao.com/ckfinder/userfiles/files/fexiw.pdfIn PDF document text
    • https://mbbs.hr/files/47270063299.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210910_11298D9D3F61B2A6.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210911072144.pdfIn PDF document text
    • http://tatnhapkhau.com/ckfinder/userfiles/files/lalelagakem.pdfIn PDF document text
    • http://rrarental.org/upload/file/bonake.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/68339573701.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/4fd58fa8caf526439d55c891e1efa4dd/36852827566.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/5892762801.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/61689774568.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/wojitudolamukera.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/422abcde4232a79f5ce0560896ca1283/86527015121.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/8ca1bd492e2dcdba9145d9f45b498c8c/76646124717.pdfIn PDF document text
    • https://halkum.rs/files/55627813525.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/xuxirevewibodanuf.pdfIn PDF document text
    • https://avukatwebsitesi.trakyasoft.com/upload/files/nolipil.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/64632798107.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/jizosa.pdfIn PDF document text
    • http://mlsconsulting.net/cms/files/File/65021520984.pdfIn PDF document text
    • https://ofcourselc.com/admin/uploadsfile/15328220930.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_off0000c6e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E5 10788 bytes
SHA-256: 7a399ea21c6e11344fd3984cb34bacd1c9e5a0a204bf5d1980a94d065e224b29
font_01_sfnt_off0000dfaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAF 18360 bytes
SHA-256: 781391d17442fd3119d65dbc7119d4abb7e94e7d462a16cbfc93837337c57bf3
font_02_sfnt_off00010f9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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