Malicious PDF — malware analysis report

Static analysis result for SHA-256 265ed7e856b3ce32…

MALICIOUS

PDF

81.2 KB Created: 2021-08-24 04:30:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9f846bd89d16b7466d6ad66d5c8d4ef7 SHA-1: 27b5e0986ba0274a1e696133342d8a978724598f SHA-256: 265ed7e856b3ce322f021492976e48f0205c8580925ce204c29ac40d35b0cdc7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, but the presence of external links and the overall heuristic profile strongly indicate 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 https://pixomot.ru/uplcv?utm_term=does+cocoa+butter+contain+caffeine PDF link annotation
    • http://musikpark-live.de/userfiles/file/74925786280.pdfIn PDF document text
    • http://hutergroup.de/userfiles/file/84312974648.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609a82b1d1796---75097425251.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/83652343659.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/juxufuzefabo.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce3fdc0df6---kekogitu.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a116aef6c0---84508449073.pdfIn PDF document text
    • http://hubbardfamilycircle.com/clients/62940/File/27861104747.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/5hosgu4bfh44re47r1j2mff6n5/41920964860.pdfIn PDF document text
    • http://farmina.ru/uploads/files/ligasa.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/36652976590.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/rolukawikejiragofejifekif.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8eb8686c31---99242999952.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/55598129832.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1609c319568b24---jebebidejamumemaja.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/20563479aef13e72b7c9ff63af1feaf9/21985292115.pdfIn PDF document text
    • https://polaria.cz/images/file/zunafikobaferutawemem.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/29598818520.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents//files/52612538945.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/ff902932d6aaeb48e343801a5032864e/mijuvaloreduxuzufidefan.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b013dda94ec---mozened.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/zejopazav.pdfIn PDF document text
    • https://capital-tic.com/upload/ckfinder_temp/files/20210529203502.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_off0000dbe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE8 10524 bytes
SHA-256: b2ce025051c0630cc564c7b691a5a7d66a6a1befbc10a6ca6757a56cae0f9747
font_01_sfnt_off0000f406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF406 17040 bytes
SHA-256: 0bcfcdc5a8592fd00db021265a9ad69efb8e10884c4c78f441fbce2173de9c30
font_02_sfnt_off00011fa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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