Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe94cbcbbe6bfb99…

MALICIOUS

PDF

88.9 KB Created: 2021-07-22 11:12:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f9cbd2de0f385de53c37ee6488f9c38f SHA-1: bfe555f4c3bb4126dc3e6bf11d44e073c5d9ae0d SHA-256: fe94cbcbbe6bfb99a97d6ff82d7328e3757a6a4fdba4dcbfbb4e460c5d0f1f01
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites or disposable domains. This behavior is indicative of SEO poisoning or a distribution point for malicious content. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://dynasty888.com/image/files/20210616_053342.pdf In PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3ddfcf322---munag.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2e1e6f5a6---13929375335.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607015eda3507---ratudelo.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cff5b970ec---96736755370.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/9112411395.pdfIn PDF document text
    • https://ladangmimpi.com/contents//files/pazonazozo.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/6b51854095a9f79addef7466c7f5c2a6/27834542970.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc17057b602---fuveluwilidaborix.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/naridosagifufunave.pdfIn PDF document text
    • https://satybharat.com/ci/userfiles/files/regivoluperunojijusapiva.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/57998412747.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/adbad23c453d037cfafccb49c3955654/7080104306.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/ec95fcab79f49aa00c37a8f5855647c5/zewusomadope.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bcfff9a7962---vezufodoje.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/difotoxevafoxes.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/banos.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/57219576288.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/246fb4e3e42c4a5567e4ba614ffcc664/14555117844.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/39805192723.pdfIn PDF document text
    • http://ovodatar.hu/userfiles/file/xobisebebovoroganug.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160bb3b240bdf8---zarebewatobalefutani.pdfIn PDF document text
    • http://ohcsi.com/ckfinder/userfiles/files/69670515994.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ce0aa585e52---bomozadijavojakezolitux.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/kifinegutusil.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/97602789319.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=the+night+evelyn+came+out+of+the+grave+full+moviePDF 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_off0000f68f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68F 17556 bytes
SHA-256: 739373777fe7da11aea0f1ef2c91f01d1da45a198ca8f200bb71904ac7e932d7
font_01_sfnt_off000124f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F1 10856 bytes
SHA-256: 55ee746cdc5e5b9b3677d43c6920a51d7dc08eac3c818a69a7a475ce97a90806
font_02_sfnt_off00013de0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1