Malicious PDF — malware analysis report

Static analysis result for SHA-256 cceaf275ecd5bcdb…

MALICIOUS

PDF

85.0 KB Created: 2021-09-20 01:02:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2114f253ec30abf31f539f1370ff4f98 SHA-1: 9cc07ed28ea731bf703888180849f1842dcefb39 SHA-256: cceaf275ecd5bcdbbd5656303fb9e43d740c11111f991c6bc2965d6b1a235d8d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on potentially compromised or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the structure suggests it's designed to lure users into clicking these links, which could lead to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://ketex.com/trcgp/ckfinder/userfiles/files/53863973796.pdf In PDF document text
    • https://detectagsafety.com/ckfinder/userfiles/files/23090578665.pdfIn PDF document text
    • https://futurefacesmiami.com/uploads/file/komem.pdfIn PDF document text
    • http://czerwoneiczarne.pl/files/file/gemak.pdfIn PDF document text
    • https://semangkabiji.com/contents/files/fujowisinafovotifi.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/runag.pdfIn PDF document text
    • http://numere-mopede.ro/mm/file/65605921652.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/fepat.pdfIn PDF document text
    • http://toanlinh.vn/upload/files/jojipemavovu.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/50147324172.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/fetixepudimezili.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/wukiroxawugu.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/79996541920.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/15001884436.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/55347478565.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161443bdcc7ad4---10227325400.pdfIn PDF document text
    • http://youil.org/userData/board/file/24267124861.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/kikuzilolipapub.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614090fc6ec4b---limidasofe.pdfIn PDF document text
    • https://szemvidito.hu/sfwkr/feltoltesek/Images/Image/dufedewabujojixovagapep.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/83885509120.pdfIn PDF document text
    • http://chhattisgarhsanskritboard.in/sharpinstitute/images/files/58931158373.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+secretly+screenshot+snapchat+iphonePDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614189caebee9---nirimasixa.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_off0000e848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE848 17960 bytes
SHA-256: f3d79e4b23fe8822507981d020d1c80a0c226b6126780366935f3aa88b6ae167
font_01_sfnt_off00011629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11629 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E40 10660 bytes
SHA-256: af8e138a4390a427a6882cefcfdf17db245aa050509f541547e942fc9287c0b4