Malicious PDF — malware analysis report

Static analysis result for SHA-256 f321f2e3374604a7…

MALICIOUS

PDF

80.3 KB Created: 2021-09-23 09:09:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5d690a2dade0f87e5dfc06e4b6e05caa SHA-1: 02e257080d4fc8cba498db339ddaa91a7f395160 SHA-256: f321f2e3374604a761f100ec1fcc3f46c6ef617c52c0e92c2db6b4f6fb7e8e3a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress upload storage and disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://crysiq.ru/uplcv?utm_term=pass+image+from+one+activity+to+another+android PDF link annotation
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210915_6914CED74130CDB0.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/21157893808.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/62531492342.pdfIn PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/45949470457.pdfIn PDF document text
    • http://china-shengbang.com/upload_fck/file/2021-9-23/20210923011741434820.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210912_F00B054F48226532.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/wusif.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/metete.pdfIn PDF document text
    • http://proart.by/media/file/25636272891.pdfIn PDF document text
    • http://hpcad.pl/Upload/file/14390889851.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4be682051---59671166201.pdfIn PDF document text
    • https://genia-groupe.fr/images/files/2346111923.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/61305993660.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/86190831356.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/maguzixoserukuvugane.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/belutibagegipazuvom.pdfIn PDF document text
    • http://ladna.pl/user_images/file/21332917410.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///96104383417.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161373c013c072---3567866715.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147aa012d15c---27878338301.pdfIn PDF document text
    • https://moyaexpresss.com/ckfinder/userfiles/files/bikutetixipajivuf.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/3942828341.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/letis.pdfIn PDF document text
    • https://printsolutions.ro/uploads/wysiwyg/files/sofixobisoseli.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/34125465207.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_off0000d324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD324 11056 bytes
SHA-256: 11ed602c19f26365bb97a6b7e3c07998db1345c4e19b2cfc6f209210f3f29781
font_01_sfnt_off0000ec8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8B 17836 bytes
SHA-256: 7c2a58a4dc8872ed71e9374bf500bebe342565edec9e9feee04a6a108ea623b6
font_02_sfnt_off00011b63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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