Malicious PDF — malware analysis report

Static analysis result for SHA-256 41b5862e22d764ac…

MALICIOUS

PDF

74.6 KB Created: 2021-09-04 23:11:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5bf23fc99becba9dc3d8b7b794d5f782 SHA-1: 9014dc39151756ee64f74311c4ff0ec42a5a05e7 SHA-256: 41b5862e22d764acf10051c1d3fdeabeaeb138877955107d034d82a288024d91
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised WordPress upload storage and other disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the nature of the links and the heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://aljazeerahdrilling.com/userfiles/files/wonipupugejekovimiw.pdf In PDF document text
    • https://mcdelandes.ca/uploads/file/jupobasawijazesedaposav.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/161082fdf9c4dd---miduvog.pdfIn PDF document text
    • http://caythuocdangian.net/images/files/reradovagoxagibunopesadif.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16092f6a19d358---38739308957.pdfIn PDF document text
    • http://nigerseedindia.com/uploads/nokukimerosarix.pdfIn PDF document text
    • http://ihdbd.org/upload/files/48711882433.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/92b29f40c0d5aff7e15d32d622c19bd5/xasulajunokafu.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/23641015028.pdfIn PDF document text
    • https://www.esfa.bg/root/ckfinder/userfiles/files/12668369069.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/jibigatapolabudosizizodew.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/83287134426.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/508d725a45a025698d944c972803f7a3/21394906107.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/sopudubavilusoxo.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090dab8b2068---migerabif.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/99388722748.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/9k8v76tjiudh87q1m8e1kqlgi8/ruladubuto.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa591e53a7---58696150732.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3f5b715ef---64803675737.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/levanowabaja.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/biwuxugexivezeku.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/tinoredexaxemuribivej.pdfIn PDF document text
    • https://samowar.ch/upload/file/nibozukazupekuregekesuku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=fountain+nozzle+design+pdfPDF 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_off0000be7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d68f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68F 17848 bytes
SHA-256: 040402231fd93bd5998a814d998598f7d656592f84fba96484ae4fe38b017170
font_02_sfnt_off000104cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CC 10708 bytes
SHA-256: 925b3330c94be3bcb5e95f8d34c42c29b0a224903ae0ca0b36d1f70625be1d96

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