Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d4983d109eabfe6…

MALICIOUS

PDF

88.6 KB Created: 2021-09-18 16:14:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 8bfaf2ca7a8b62b8760a9d6525bbf00e SHA-1: e8d29553ed3ccebe04afbbb8c72688aaeda29456 SHA-256: 8d4983d109eabfe6f9cfabef5bc423341eb32eacda0e5d214c2eb4d32f6dce1a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics further supports the malicious intent of directing users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://huntic.ru/uplcv?utm_term=android+presentation+ppt PDF link annotation
    • https://baptistfriends.org/media/botesiperigaruwefawupuze.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/47717551228.pdfIn PDF document text
    • https://ngonluathan.com/images/ckeditor/files/23517356191.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/94391485856.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16131f19897210---xewipefisezaselifepezowil.pdfIn PDF document text
    • https://fuoriscena.eu/file/pojusukirugatavovubej.pdfIn PDF document text
    • http://tonghuichem.com/upload/files/71163642002.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/13306800857.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/74476328996.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/pifagezitigedafila.pdfIn PDF document text
    • https://kcss.hu/korosi/userfiles/file/12957169710.pdfIn PDF document text
    • https://quangcaowebsite.xemlaco.com/uploads/files/segemutav.pdfIn PDF document text
    • http://888chji.com/userfiles/files/dejifeganovemawasoximezap.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/17617122858.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3831d0cbe---jiliputuborupu.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/38b9e875325acdb00c8864a8f13043cb/14723815226.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/zupidurupavub.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp/files/nerotagozil.pdfIn PDF document text
    • https://xcheck.vn/uploads/userfiles/file/xedineteda.pdfIn PDF document text
    • http://wwsm-us.com/files/file/puwowo.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161317f09ea77f---37626000704.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b653415b32---56160646247.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/60914976518.pdfIn PDF document text
    • http://sanalights.com/admin/admin/uploadfiles/file/kuwidukuwogedubikup.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/buruka.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_off0000e365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE365 16760 bytes
SHA-256: 7066380b94580a049c2c45fd87f51d82caf20c0ed926f82605050b09bbc04a6b
font_01_sfnt_off00010eac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C3 17712 bytes
SHA-256: fcfe693dd81e1a75d0400c0024e8932e3cd61a93b579a46ad2dc6743f009a6df

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