Malicious PDF — malware analysis report

Static analysis result for SHA-256 85e1968b31fe9016…

MALICIOUS

PDF

87.1 KB Created: 2021-09-10 10:21:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8e7ca86b87cefadd282724c06ac87541 SHA-1: 62022500c36f63e917285c6d6d2e851544ced19e SHA-256: 85e1968b31fe9016d25eecc1d95ff7934839ae67b04c13e5a524cec43c957783
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The primary purpose appears to be to lure users into clicking these links, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132d7a79d659---96282241761.pdf In PDF document text
    • http://pscworld.eu/ckfinder/userfiles/files/25268555596.pdfIn PDF document text
    • http://fruitvita.com/files/files/katatazasitasaxamasapefuf.pdfIn PDF document text
    • https://gemicilojistik.com/userfiles/upload/file/nakatorubexatoxonebifebot.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/29879370454.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/9e7d91e956e84d8c691cadec55f24898/wotalo.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/loiv9qrneh8h64em2pomrb48jj/30722164189.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/bulazemonorovaxutu.pdfIn PDF document text
    • https://yantrasearch.com/ckfinder/userfiles/files/13812100753.pdfIn PDF document text
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/zijozar.pdfIn PDF document text
    • https://jphotographyllc.com/userfiles/file/46001334159.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/94684691667.pdfIn PDF document text
    • http://fk-fudosan.1nino3.com/app/webroot/img/userfiles/files/95847430424.pdfIn PDF document text
    • http://gianenricofabro.com/userfiles/files/fiweda.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/fuxirawi.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210907094837.pdfIn PDF document text
    • http://newgatedesign.com/Images_upload/files/68323588183.pdfIn PDF document text
    • http://sky1981.com/asset/uploads/files/88733795706.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa09ae1571---73610837416.pdfIn PDF document text
    • https://sunsetlearningcenter.com/userfiles/file/50445604475.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/sitijonetop.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/5429840778.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=gta+vice+city+android+version+downloadPDF link annotation
    • https://tes-sys.com/uploads/ckfinder/files/20210901/16304722379395.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_off0000ebcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCD 10668 bytes
SHA-256: 97eda739088859124642194f9673c33d5c4a2c95d7d18cd189995471f4de15c8
font_01_sfnt_off00010482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10482 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C94 19200 bytes
SHA-256: 1bcc3784ca76aca297ea40bc42c2199bd12fe5667900c06effea5365579b7631

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