Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fdc0a9d453d3704…

MALICIOUS

PDF

83.6 KB Created: 2021-10-05 20:18:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: dcacab75660725a5a392d17cd22df22e SHA-1: ad7a345b201e66bf1c5b9571b098b5b7dcf71b09 SHA-256: 8fdc0a9d453d37045f500019ba6ca408be1d1c9c057129c4ecbe598a68e29afd
156 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ML classifiers and ClamAV. It contains numerous links pointing to compromised websites, indicating a phishing or malware distribution attempt. The PDF structure suggests it's a link farm designed to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://dioceseofniranam.org/userfiles/file/sadaxat.pdf In PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1f83b3910---fapilebo.pdfIn PDF document text
    • https://mlbcsimleague.com/ckfinder/userfiles/files/rejawesejapojonazari.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/58837026690.pdfIn PDF document text
    • http://helix.chuing.net/mai/ckfile/files/xogojoxegajiku.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/vulekavukisajuju.pdfIn PDF document text
    • http://www.autodesguacecoin.com/ckfinder/userfiles/files/16501983135.pdfIn PDF document text
    • http://dangkydoanhnghiep.org/hinhanh_fckeditor/file/jufumor.pdfIn PDF document text
    • http://dolonchem.com/upload/files/bixipogolesasi.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16159124f33591---bupagagugutobafamelebo.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/20075274779.pdfIn PDF document text
    • https://optimuselearningschool.aels.edu/learning/site/images/uploadfiles/95798105709.pdfIn PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/pitokijavorar.pdfIn PDF document text
    • http://96rangjai.com/userfiles/file/wuwebojofekararafini.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/newapesunopiro.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/41771677384.pdfIn PDF document text
    • http://shiokuda1.com/contents/files/dekakagatarupo.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/kuvejaxed.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16130defeb98d5---98439635733.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/jesiritubex.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/62909160546.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/38043749390.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c4abb9aeb---zalozekasatozitogibuke.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/10566519113.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=context+in+the+communication+processPDF 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_off0000de7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7E 18880 bytes
SHA-256: 67643b85e3b72b34046514d91e8f5e3153b1ee0c9a46f229ad8d43fc126f5a78
font_01_sfnt_off00010fb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127CC 10824 bytes
SHA-256: 63f758676bcf56dd2afbfdb8ed8790402094f7bd788cf8f09aa09f7d176e619d

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