Malicious PDF — malware analysis report

Static analysis result for SHA-256 7750bb4c1f7dca94…

MALICIOUS

PDF

72.7 KB Created: 2021-09-25 07:31:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 40dd0ea20ffab414c1643eea96eea38f SHA-1: 2de8c402bd83d96c14304e4a70f963a3a09b35fd SHA-256: 7750bb4c1f7dca9459e84feb4944b0ae2108da1f9e25f8af61bc838e21ddeacf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The sample also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised or disposable hosting sites. These elements, combined with ClamAV detection and ML classification, strongly indicate a malicious intent, likely to lure users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://skulpt.in/admin/uploads/file/wosupebir.pdf In PDF document text
    • http://maslag.eu/userfiles/file/67037790154.pdfIn PDF document text
    • http://mywayrtk.org/userfiles/file/vuxepofopavuj.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/nitunabufiwudesejirudul.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/95539748926.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/53190819652.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/disipo.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/58040280134.pdfIn PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/25214804260.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/57905552343.pdfIn PDF document text
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/wuvigufiwan.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/bugovokulisulabuget.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/dunukaxiwusipipip.pdfIn PDF document text
    • http://xn--2-7sbddqrtdw3be6jua.xn--p1ai/userfiles/file/97815462302.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/zikakapamas.pdfIn PDF document text
    • http://stonebreaker.at/dupipasatozi.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161302d0d89cc3---16719612906.pdfIn PDF document text
    • http://bookblog.kr/data/file/files/16778112652.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/40996721319.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1614ba38689cb3---zasonular.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/soxerekewifopumepabosuf.pdfIn PDF document text
    • http://gtlfuelmarine.com/userfiles/file/73401521199.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/ruxokuto.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/84o1e3n7t7m6r1nchkhe9vg9f7/68286378178.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=instagram+bio+copy+and+paste+artPDF 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_off0000b741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB741 11016 bytes
SHA-256: 8c4d2ba50c12b955bede2e2d72bdc1197206ea733d27e3a83c1edec368ed1ad3
font_01_sfnt_off0000d07f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD07F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE891 17368 bytes
SHA-256: 10dff5bd03559d16b08514b2fa8122a93b045f79ee646872f6e6016932dfef6b

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