Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ec945cb0eb37400…

MALICIOUS

PDF

80.4 KB Created: 2021-10-13 05:18:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4aedc785767f82c84b49267d66ca9749 SHA-1: ea9bddf9a38c1fc469dc31aa686380772a6af3e2 SHA-256: 3ec945cb0eb37400038bfd64ea3be174d0bcf7795183ea56ce2db222e26c1c38
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV, specifically as a phishing trojan. Static analysis revealed it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely serve to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4208

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16133ed7dee05c---60030579215.pdf In PDF document text
    • https://coevent.ru/upload/files/79636425031.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/fbcf52b5e78ccd3545930d8c0d1af06c/fadigarinosudevulivege.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/83882792032.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/48841985127.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/87555609622.pdfIn PDF document text
    • http://vdtonline.vn/static/uploads/editor/files/faparatugud.pdfIn PDF document text
    • http://app0.linkeo.it/ckfinder/userfiles/files/6390199524.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/sogijekunowikum.pdfIn PDF document text
    • http://greenflameenergy.com/userfiles/file/voxufogifi.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/88690925013.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210910_4EACD8934523D93D.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/15523629611.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/zolepajobux.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1616569c9693d6---motiriwuma.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210904100618964.pdfIn PDF document text
    • http://brenderup.ro/mm/file/dowixozib.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/lozunipu.pdfIn PDF document text
    • https://tckontrola.hr/files/75626913819.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318e2a9f2f1---kanuzadulezevefese.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/negerujomuvafix.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/tizabipixifulotexizuva.pdfIn PDF document text
    • https://carlojans.com/cms/file/futibivozejedazezijosidi.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145d485a0fac---fiwezuw.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/6Zflnl449io/uplcv?utm_term=team+to+serve+volleyball+hand+signalPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000108be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BE 18044 bytes
SHA-256: 09433f0556278bc4c7f70022bf826843f9521feaa2c2fc7151be062a205d85a6

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