Malicious PDF — malware analysis report

Static analysis result for SHA-256 8da066cc3656d31f…

MALICIOUS

PDF

86.0 KB Created: 2021-09-11 13:00:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8808ea60c6f3b8a2f89376209cfe07ac SHA-1: a18cd89a28184f9408456772e560e74a91a4db96 SHA-256: 8da066cc3656d31fa4dd6c4ad419c7fa26b80a4d91a9a25e328257b5cd21afcf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://wastran.ru/uplcv?utm_term=bronfenbrenner%27s+ecosystemic+theory PDF link annotation
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/konelevimevowenax.pdfIn PDF document text
    • https://goldenlinejsc.com/userfiles/file/jikelezefewis.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/tojugo.pdfIn PDF document text
    • https://www.emcp-pmce.ca/_includes/ckfinder/userfiles/files/33549666180.pdfIn PDF document text
    • http://dulichgiahy.com/upload/file/fufuve.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0256d49e7---ritagibotagamesopadovume.pdfIn PDF document text
    • http://manvilastrust-org.bvirani.com/ckfinder/userfiles/files/wukizedelum.pdfIn PDF document text
    • https://akilanews.com/ckfinder/userfiles/files/72452105551.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/07ffb10ae46d8b1a8d06bf0fe48090ff/gadotetukuxalabunakit.pdfIn PDF document text
    • http://ccsctda.com/ckfinder/userfiles/files/20210904_120243.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/73608782973.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/solozopobopejuge.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/12814e3387e68a585b68655ce6f8afde/44712627097.pdfIn PDF document text
    • https://mavibusiness.it/file/9456237426.pdfIn PDF document text
    • http://larben.cz/media/images/upload/file/novibetugetokonomub.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/gizumuwefibez.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/31158211587.pdfIn PDF document text
    • https://jagamimpi.net/contents/files/letemozadapufejariseze.pdfIn PDF document text
    • http://prepearl.com/uploadsfile/2143191523.pdfIn PDF document text
    • https://regionalhealthprogramsww.com/images/file/97043045796.pdfIn PDF document text
    • http://albertf.madteam.net/ckfinder/userfiles/files/82507207535.pdfIn PDF document text
    • http://smalternatywa.pl/media/upload/files/671aa0e1a809618587652fb5c7a010e3.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/miwubowamanojonoduxivimux.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_off0000e943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE943 18920 bytes
SHA-256: ade003b3ba29ecf85e7cc9a1eeab4a340b109026c86e61633e5c57f4fc2e5b9e
font_01_sfnt_off00011a36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A36 10732 bytes
SHA-256: da7b53f24bce132583d65e28101b55d85524b084bc0c8e863198a2c7b90e7b69
font_02_sfnt_off000132cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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