Malicious PDF — malware analysis report

Static analysis result for SHA-256 d37e995b121e5fc6…

MALICIOUS

PDF

81.7 KB Created: 2021-07-17 12:26:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c0ed8fc9c3149212d6534cd9bcf16131 SHA-1: 55768dacaa561c249010e576d6616b34b0829b9d SHA-256: d37e995b121e5fc6b745b7098066ab23c697001ffbaaf67f7088e6ebb69c9a1d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing lure or a downloader for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://quiltingacademy.com/fckeditor/userfiles/file/delugerikunekesan.pdf In PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/f6646fbfb373820ca9d298753e397f54/siripifavoxanexedak.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aea3a7f447---72883037290.pdfIn PDF document text
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/vosejokawiginabirowulif.pdfIn PDF document text
    • http://hibertek.com/image/files/20210702_024915.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021521429249704.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/9106750abdbf053dcdfa4aab4618ffb8/wasefotibu.pdfIn PDF document text
    • https://bachson.net/upload/file/5567752386.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/fobofaliwidopunawof.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/ee556327e07bce9fec104cc9b7e0e576/51216121392.pdfIn PDF document text
    • http://houselandia.ru/files/53997013769.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/be34a1f58fa42c58533a7e73ffa53056/85404783863.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/051ca9f9addb9adfafd17ff076d94308/32756445960.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa01118418---97393702582.pdfIn PDF document text
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/446b6bf0d4cf033df0e9f875c3c3c041/xukemato.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/gisabav.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/ed32a8b5904777215fee0a611a7a9fc5/95250697692.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2007fe4938---peratemutopanudim.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fc8352dda---pifako.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/reredozosuzuj.pdfIn PDF document text
    • http://kennedy-jackson.com/clients/f/f7/f78508644b517540cdb1549d93860f53/File/58791816300.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/vudotugogelalugap.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/12071624006.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084054706054---kokaputifatonufojivibe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=a+little+less+conversation+a+little+more+touch+my+bodyPDF 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_off0000d7d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D9 17564 bytes
SHA-256: 241bc200bf9521757d315ccf37552bdd53eb6fa13e82648331e00e3faeaa2f4c
font_01_sfnt_off0001056a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056A 11036 bytes
SHA-256: a51090503263f8505d6481dc0f0f04b3ceb463e2906457cd95e20f9cdc8529d7
font_02_sfnt_off00011ef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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