Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf0426b6c6052d0a…

MALICIOUS

PDF

80.0 KB Created: 2021-09-03 05:04:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0137817e1acce468e82debf3c2c138ea SHA-1: 336c78a8f425fc8fc787812c078f9303cf2fe952 SHA-256: bf0426b6c6052d0a174099b9249ea0d9037c9a67635154d6831bb666e7f08e3d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely exploits vulnerabilities or contains malicious content. The document functions as a link farm, with numerous URLs pointing to compromised websites and disposable hosting, suggesting an attempt to manipulate search engine results or redirect users to malicious sites. The presence of external URIs and the nature of the link farm strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160711f2235bbc---pedizobode.pdf In PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/53eb8d1af03c80d2a9df7be2e17fb603/xotawixad.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/26645730054.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/nikeni.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b191b13df0f---dujem.pdfIn PDF document text
    • http://derma-dts.de/files/file/12955050389.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/sujele.pdfIn PDF document text
    • https://totounited.com/contents//files/50206628931.pdfIn PDF document text
    • https://pubs-icfas.org/icfas_new/dev/ckfinder/userfiles/files/sevuborazi.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/90400713669.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/brppgs29jr7eeskh4uo1328aeh/fizedeluredazitepisuleg.pdfIn PDF document text
    • https://digireg.it/upload/tabijafidogo.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160976904bec81---jupejebuxaxip.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/most8m7pq6ab6donkiacs4ceda/70113606708.pdfIn PDF document text
    • http://thecrayfamily.com/clients/36408/File/56835756099.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/forola.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160d40151e4e86---6961199219.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804cad7f08f---97664520764.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1607638775e5b8---jegobifobidabi.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/05/file/202105150301117455.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/jolotururefoned.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/qjurqov6c6huvl4tiidg34ue52/51977704031.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/23728842003.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=census+2011+highlights+for+competitive+exam+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_off0000d211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD211 17288 bytes
SHA-256: bafcf1e23741f9bce15ff363ee06c081ba03da3e0d4eb1216caca7d18a3c0f4a
font_01_sfnt_off0000fe90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A7 11660 bytes
SHA-256: 616b201ecc9bcdb39df0056d75490a147da5f077d5e8fafedd50a420342bb12a