Malicious PDF — malware analysis report

Static analysis result for SHA-256 41afe0cdb963142a…

MALICIOUS

PDF

93.5 KB Created: 2021-09-02 04:50:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 31baad494e2fae90bf8685dbbe3ad73d SHA-1: 5ff409684255b59940bb4d0b9a2a38898574340e SHA-256: 41afe0cdb963142ad55729df67c77ef601eb578b54c321f050757eae39b078d8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous embedded URLs, many of which point to compromised or disposable hosting sites, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/1681752484.pdf In PDF document text
    • http://thermcom.cz/userfiles/file/49655065856.pdfIn PDF document text
    • http://firanywiktoria.pl/uploads/editor/file/20705441455.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086acff9c6d1---kanelogarunimorerozizaxaf.pdfIn PDF document text
    • http://ersenergy.com/UserFiles/file/44020570600.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/004k4gqb4nukou5kcpkat7u1u3/nugusi.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/v7ffcp53kfko3fr4fpesm0bari/fexubabafarit.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba73ffc5d05---75157570928.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be76b40ab14.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/uipefkhdug1cu2vdo37fji6v3o/58265815655.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/a52pk4t6uolstccf8d7e5c8c92/wujebubojezexibimanifide.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/b359a56fedee5963ee07413f78dbb925/98121939644.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/98p9sbgarcq3a70dp9i33426os/tezani.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160dfa747d1e0f---78194388988.pdfIn PDF document text
    • http://minhvuongthuphap.com/upload/ck/files/26325134378.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2ee2e03bd---fezije.pdfIn PDF document text
    • http://roleco.pl/data/aktualnosci_imgs/file/zirufepupuvoju.pdfIn PDF document text
    • http://www.propper-droppers.nl/files/file/19753308410.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/kajoduzuvarevukeve.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/12979177454.pdfIn PDF document text
    • https://www.wemservice.com/ckfinder/userfiles/files/26108819101.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/4949d64b5924d9221c6f2a6c345e7f88/reninekajigokebolobi.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/zesavurazefejizujiliropo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=gross+income+is+before+taxesPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d2a8ddd88---nawibuto.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_off0001047a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1047A 10732 bytes
SHA-256: 398ee47f5f4de709470b63949bff5ea187e5c33ecfdca4338781060d54bd757a
font_01_sfnt_off00011d37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13549 19628 bytes
SHA-256: 78c657683f1d055a53961aa5f3092bd565ec2eeaa33922c618fb75e5040864f1

Open this report in the interactive analyzer, or submit your own file for analysis.