Malicious PDF — malware analysis report

Static analysis result for SHA-256 d57a0d0ec4268fc1…

MALICIOUS

PDF

72.6 KB Created: 2021-09-28 09:21:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b157989e77d68f46dc4a3555dded944f SHA-1: 4a7aebf711b4caeff46bc054cb0deb2305eaf50d SHA-256: d57a0d0ec4268fc120f8dcf7d6c42bb5f5cd5997246a1453a33593534cc30d32
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to redirect users, with one URL specifically mentioning 'tubidy+audio+mp4' suggesting a lure for potentially unwanted content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://philabc.ru/uplcv?utm_term=tubidy+audio+mp4 PDF link annotation
    • https://suadienlanhhanoi.net/upload/files/movovumedolarewa.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/5ee42f1300859118772b5dea46953fc6/bikuwagiridizototaw.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/xifidimedagesawebi.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/mazidavokorome.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/30323796246.pdfIn PDF document text
    • http://zjleiou.com/images/upload/File/sigesenuni.pdfIn PDF document text
    • http://kmjmt.com/news/upload/file/210910203536017654ljo7nt.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/fomifumululupivumesizin.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/gujilifubulipidudexedusi.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/gosegefogumupuw.pdfIn PDF document text
    • https://equimat-cheval.fr/file/xitajusokoganaxob.pdfIn PDF document text
    • https://siksp.megarhizo.com/ci/userfiles/files/89483811895.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/161425d1f1a9ee---mofaz.pdfIn PDF document text
    • https://liftsystems.ro/LiftFiles/file/55682617381.pdfIn PDF document text
    • http://btsoft.vn/uploads/files/mexuvinosimaf.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/piwoxezekipurilagiguzeli.pdfIn PDF document text
    • http://monticellotownship.org/userfiles/file/tejilozavulozi.pdfIn PDF document text
    • http://www.reeder.ee/files/filemanager/gasefelotor.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/kakiparuwo.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413afc3ee3e---wubaliduluparelorojifus.pdfIn PDF document text
    • http://asesoriazabalburu.org/azaba/files/file/duvokijozolamuki.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f99bf2c916---22463790256.pdfIn PDF document text
    • http://119pump.net/d/files/80602147386.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/66381883371.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/73014651064.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/bozuguz.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_off0000b73b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB73B 18128 bytes
SHA-256: b0b723c34e3e602ec0be9aef5719a1cebc511f231ab97a79d843cbd359a5d0f2
font_01_sfnt_off0000e596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE596 10300 bytes
SHA-256: 9239f7e375c2601c515c527fae45a27904dfe8ce2649ba6c6d0bb10056ef5694
font_02_sfnt_off0000fc92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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