Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fdee65c0658e349…

MALICIOUS

PDF

97.6 KB Created: 2021-09-18 09:47:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5ea50acb8ecec8a9b40fa430d087f26d SHA-1: 0522cf9180f13793c7d18a082addd03d664627a8 SHA-256: 2fdee65c0658e349f094a214ccc610e9b7d426feba78da7e52adad0d634e0264
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting. The ML classifier strongly indicated maliciousness, and the PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristic confirms that some links lead to malicious upload storage. This suggests the document is designed to lure users to potentially harmful sites, likely as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • 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://bahamianbrewery.com/ckfinder/userfiles/files/59105920191.pdf In PDF document text
    • http://bellamy.tw/uploads/files/202109092312091596.pdfIn PDF document text
    • https://magicdiscoradio.com/userfiles/file/dumoxuxuzamivemalab.pdfIn PDF document text
    • http://vibrator4you.cz/UserFiles/File/fakegetubew.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/b417ce4a5fa92fab8170b0d798d23603/wevilenoluvesab.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/10580057906.pdfIn PDF document text
    • https://netpage.info/userfiles/file/vujikiri.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/pivepesiguvek.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16137bc77c4030---lutezezun.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/70997e7b5fdc4c1a23861fe8f57c7d09/tazuzo.pdfIn PDF document text
    • http://dubilex.com/userfiles/files/19332248631.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/novuf.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/29355217643.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/97197610920.pdfIn PDF document text
    • http://kelvista.lt/images/files/19375734486.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614389bb13a73---lugejuxomap.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161450cb34c44b---53548796996.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/bisurisomajofeledoterejuv.pdfIn PDF document text
    • https://cplastik.eu/data/cms/file/58016701303.pdfIn PDF document text
    • https://ms02bet.net/contents/files/rutugodatapaseranimuv.pdfIn PDF document text
    • http://techbis.pl/files/file/40359623446.pdfIn PDF document text
    • http://fuyu.010bi.com/ckfinder/userfiles/files/16928373049.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=warhammer+40k+9th+edition+codex+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_off0001150f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1150F 11224 bytes
SHA-256: 5e307548415133bacbac11f4d293842c84c4eb822c161f37727b006572b30afa
font_01_sfnt_off00012f39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F39 18912 bytes
SHA-256: 8212982b1e60f636891e3c24fe2e1e95d042164174619677ab2192d224b3ad6a
font_02_sfnt_off000160b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1