Malicious PDF — malware analysis report

Static analysis result for SHA-256 90603ad38c71a53b…

MALICIOUS

PDF

73.5 KB Created: 2021-10-04 13:51:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 259259cdf5d29767f36f797595f51bd8 SHA-1: 1a86c153c1a819d9f95b8ec91c0d88666c3cee8e SHA-256: 90603ad38c71a53b5b93f311f56e47a457b712276082b892b6a6c9dfaf5fdb6b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with several URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. No scripts were extracted, but the overall structure and URL findings point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8530

Heuristics 5

  • 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
  • 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://rosewoodcity.org/nbloom/fckuploads/file/59941017772.pdf In PDF document text
    • http://straps.by/ckfinder/userfiles/files/59230034425.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9cef95dea---jajatuwizigejolewariwo.pdfIn PDF document text
    • http://autowassenindex.nl/images/uploads/misuposa.pdfIn PDF document text
    • http://flirdining.com/uploads/files/84873398063.pdfIn PDF document text
    • http://domadoma.cz/userfiles/file/zabisigagun.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/vadubavofodototijixuxuzef.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/48855982627.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/zomedon.pdfIn PDF document text
    • https://snoman.mb.ca/ckfinder/userfiles/files/razipubatesefi.pdfIn PDF document text
    • http://inggeo.eu/userfiles/files/vajutogunage.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/90177160678.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16158a322573f9---51561831134.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/gorilakurowis.pdfIn PDF document text
    • http://atel-j.nl/uploads/files/relomefojasolifaziwidawif.pdfIn PDF document text
    • http://hnfond.cz/storage/file/sutegorezoritosagi.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/e1ci8ko8k5v8q3mfp3k72uibpe/dedodadokekapalek.pdfIn PDF document text
    • http://fairfresh.net/assets/admin/ckeditorimage/files/90807608034.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/wozoberijoferagiruxole.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/tosutevomeditidi.pdfIn PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/11865608029.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/3091935822.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=top+100+insurance+companies+in+the+world+2020PDF 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_off0000cbcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DE 17704 bytes
SHA-256: 8e4885d9cb02bc4ff191d8240638f7882c2a4c7e1bd01624ecfbeb28c34cfd08

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