Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccbe250acec581ba…

MALICIOUS

PDF

88.3 KB Created: 2021-09-09 03:58:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: af6774753527a0320212ce499fba7383 SHA-1: e031dd8612d22aadb5a014430267d487b462938c SHA-256: ccbe250acec581ba078c829268d838b7853b38d1b65ab59246b7bf736325eb0e
172 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains embedded JavaScript and numerous links to external sites, many of which point to compromised WordPress uploads or disposable hosting, suggesting an attempt to lure users into downloading further malicious content. The presence of a visual download button further supports this phishing and malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16137598841f46---wuweregagan.pdf In PDF document text
    • http://koppeika.ru/userfiles/file/zarakekusesiguxujisumom.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/sunirax.pdfIn PDF document text
    • http://win-sonic.com/ck_imgs/files/jolujulesi.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/16704882752.pdfIn PDF document text
    • http://mikailang.com/userfiles/file/20210903105202_720026251.pdfIn PDF document text
    • http://wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/xijusewivagideteraj.pdfIn PDF document text
    • https://cauthinh.com/luutru/files/19171294667.pdfIn PDF document text
    • http://canadapremiumlubes.com/survey/userfiles/files/32350694517.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161373a6384fe1---sawujuneno.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393320a3f02---91583396984.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/nenikabusamabagofe.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/xulufezopega.pdfIn PDF document text
    • http://highdeal.linkeo.net/ckfinder/userfiles/files/95748880434.pdfIn PDF document text
    • http://volvo-cars.jp/js/upload/files/75766682891.pdfIn PDF document text
    • http://nato-denkmal.de/uploads/file/6612007917.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/b4b6a812bb5e15402f7b8139e1196c56/80136451919.pdfIn PDF document text
    • https://phunhai.net/upload/files/28958155900.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/zekenojapanuxigate.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/darakagejebusur.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/sikajewofizitot.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/kepenisotanaxa.pdfIn PDF document text
    • http://flirtproducties.nl/ckfinder/userfiles/files/34543970659.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=rr3+update+9.2PDF 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_off0000f0d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D6 10528 bytes
SHA-256: 897a7716e1ae369ed75c262efe28d4f7243dfb8f872334d2e247b89c51415b3a
font_01_sfnt_off000108f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F8 19400 bytes
SHA-256: 7b5c1cd143233adbe4099d0aa603928f9e183b5538cdcd4e8a16f1bd77b9d66d
font_02_sfnt_off00013b84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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