Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb54258e1857d7dd…

MALICIOUS

PDF

76.9 KB Created: 2021-09-02 20:04:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: b65f95c13eb4a9744578a26ea09acae7 SHA-1: b5716a911694dad7cdbc355280cb862a00049113 SHA-256: bb54258e1857d7ddac09995bb860f9e6983629bd26c89fbe73a776756db561ec
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pixomot.ru/uplcv?utm_term=go+math+5th+grade+chapter+6+review+test+pdf PDF link annotation
    • https://mysmartedu.com/uploadimages/files/fabatewogik.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/gkekhppouv7boe6db71l7mgt82/danuwamemejefajuto.pdfIn PDF document text
    • https://datajournonepal.org/files/2833315099.pdfIn PDF document text
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/21081101020691862495nl7m.pdfIn PDF document text
    • http://envigest.cz/upload/file/39137871728.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/zemoxokupiwobatirukunumu.pdfIn PDF document text
    • http://gr-chem.com/upload/files/wepezigitijatuk.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea20a861cd---rezosizozegi.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160715a6e8973c---genegopej.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/43087541188.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f202070a4---farotezofuduzerebasaz.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/77930123101.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a58a57099a5---34666832837.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607087517011a---tazuxelowimevafuzi.pdfIn PDF document text
    • http://rgjbreunion.com/clients/6/69/6950e03db8b1ea894755b369f0a03c31/File/dobuwibojotorup.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/95466718488.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/98466844135.pdfIn PDF document text
    • https://rosettes.it/userfiles/file/85394300861.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072bc8b023d9---podibef.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/5513ab079d84a9d92682ba137382561b/gedarumunojanudagafegeb.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/mikevoguvebikapidalem.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/tpiftfr2usbknhb10int631fn8/42701534505.pdfIn PDF document text
    • https://nhabe.com.vn/ckfinder/userfiles/files/28541353995.pdfIn PDF document text
    • http://uss100.com/clients/5/56/562308f4da1da23328cfd9e5c9f3e68f/File/budutafiberafaxexu.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_off0000c526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC526 17404 bytes
SHA-256: d303a7cbcdf268c550dd64130ff26dca1b9c982c89c564a0d80034f3196b62c5
font_01_sfnt_off0000f2cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CB 11408 bytes
SHA-256: f29acc0bbeaa82228cce4604e07389f820b5ecd24a028144219d6b16a4761000
font_02_sfnt_off00010db0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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