Malicious PDF — malware analysis report

Static analysis result for SHA-256 2870d8e5531cfd32…

MALICIOUS

PDF

497.5 KB Created: 2021-06-27 06:48:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9ab25f5769d8af2d8e8fa6d0cdc94572 SHA-1: 2956957e876e87078f2fa135e4452a481fdc221a SHA-256: 2870d8e5531cfd32429a7a0b07af7c88ec27b03c78c48127b5331fa46fce0aa7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a phishing trojan by ClamAV and flagged by an ML classifier. It contains numerous links to external URLs, many hosted on compromised WordPress sites, suggesting a phishing or scam campaign. The presence of PDF-specific heuristics and the ML detection strongly indicate malicious intent, likely to trick users into downloading further malware or divulging sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8241

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://inwebjor.ru/uplcv?utm_term=cases+for+paces+pdf+free+download
    • http://grawerlik.pl/userfiles/file/midozavadoxoberepos.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609defdaeda6d---pewidogi.pdf
    • http://remaining-mc.de/userfiles/file/fekuromifopofimafebe.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160706dac8d67c---gonomoweredelefujiri.pdf
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/irj4l7vgiipmgv5g7gj6662im0/bedibuk.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160add68b808de---godadewib.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160acc79256b20---vebuxesaniga.pdf
    • https://tavio.ru/files/file/nakozuwoxe.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/hkru6so30p44ac6eb8qshoora5/pufudigezepolilu.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/7na9dp1n6avsj0i931k801v66t/82638808942.pdf
    • http://taxicityplus.ru/userfiles/file/70395429147.pdf
    • https://hostingalani.com/calisma2/files/uploads/devojodotedupej.pdf
    • http://www.niziointerior.pl/upload/file/1405475632.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/jn12m2chhbjtnguoi8hu23vkv1/91035439653.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa7b240372---bajudixexeza.pdf
    • http://brukbet.com/user_images/file/zipakafunijibe.pdf
    • http://alpha-th.com/userfiles/file/binalofavugurerufuvafuf.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9e2948a5a---maviz.pdf
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/c54867156b95aec424c33ea67ad05395/39629751358.pdf
    • http://komputerzagrosze.pl/userfiles/file/3462342264.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083faddd80dc---pobanuki.pdf
    • http://crosswaysrecruitment.com/userfiles/file/xativukak.pdf
    • http://pijntherapie.be/uploads/files/jarepujo.pdf
    • http://geoplan.su/userfiles/file/95714925918.pdf
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/18eebe4a358ee7f710b329d32b7338ba/74551973734.pdf
    • https://olivier-daulte.com/ckfinder/userfiles/files/bikisazulago.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160881b181b10e---mebesidelas.pdf
    • http://www.toeterloeh44.de/files/97944518387.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00075120.bin
7e637c6499ae3921d55f81b3359d6ec180cb60e9cebb7b90d85768d18de18153
pdf-font-stream PDF embedded font (sfnt) at offset 0x75120 19488 bytes
font_01_sfnt_off000783b3.bin
d323dc7bb232aeb03a4668ce1d048311258674474e4587eec2b7c54a6a93c315
pdf-font-stream PDF embedded font (sfnt) at offset 0x783B3 10540 bytes
font_02_sfnt_off00079bea.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x79BEA 16792 bytes