Malicious PDF — malware analysis report

Static analysis result for SHA-256 6517ddb3b52320a2…

MALICIOUS

PDF

97.3 KB Created: 2021-08-16 08:48:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 01f006edee95abb211cf4437a13cf046 SHA-1: eeeef306b3afbe98fe9a71c0bc0e98ac365ea10d SHA-256: 6517ddb3b52320a2bbd743acc28f3853cc0bf613cea2dabb76771346cc5c4a4f
156 Risk Score

Malware Insights

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

The file is a PDF containing numerous links, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of link farms on disposable hosting and compromised CMS uploads suggests an attempt to obscure the true destination or leverage vulnerable infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607839cdeefe9---dozigijiwudofid.pdf In PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160814a2595454---megutegup.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/57694022148.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/mekemi.pdfIn PDF document text
    • http://woorymart.com/userData/board/file/nadomemizojikofaz.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf06a048503---juvubeniwegoruxujemo.pdfIn PDF document text
    • https://folklorebridge.eu/uploads/pictures/files/semopemijafamesidojixebe.pdfIn PDF document text
    • https://suadienlanhhanoi.net/upload/files/lukogezuxexe.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/bamonixe.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16070231735ed3---jadalugutatunalomo.pdfIn PDF document text
    • http://mrbossamktown.com/uploads/files/nilesaj.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/marelifose.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/wisedixod.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dcbdd1358e2---16508517789.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/11615685917.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210803183242.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/61591784692.pdfIn PDF document text
    • http://lohsclassof70.com/clients/3/31/31ca850ff086a58b81c8700e10a01852/File/7923215369.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/defivitabasarugasiroxowex.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/2726041729.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/oekog0kab83thgfu72p5pa1tlh/gubujezigoragipud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=who%27s+the+biggest+kpop+girl+groupPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11025 17776 bytes
SHA-256: 62a83b79e324ffac6c90fdfb023a27209014ef6443f2d80b65724cb7299ed162
font_01_sfnt_off00013e81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E81 1700 bytes
SHA-256: 15171638d69c9281a983de8a04f8d213e5ed86d33053034f6aa0dd130c4010d8
font_02_sfnt_off00014698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14698 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015eaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EAF 10624 bytes
SHA-256: b5009845c7d2fb46e9489d6060ce97389728a2e63c54a4f6d8c0d9241c02d8e6

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