Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc52d6c086cad491…

MALICIOUS

PDF

72.7 KB Created: 2021-09-18 13:53:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5af09d8245701adaabe9f34548a42e01 SHA-1: dc7e788fe497a54621e085c76a351d63bf974096 SHA-256: cc52d6c086cad491cd4eba8c85083c6d2a4488f43a3794cc0aa28ac30a5b954b
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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
  • 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://zaun-produzent.de/userfiles/file/lekabagonedo.pdf In PDF document text
    • http://thermogroup.ru/uploads/files/datofatebefanabowafi.pdfIn PDF document text
    • http://tianfonmm.com/d/files/33590206427.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/0c217d64a82772506513a48d8f1620ab/89237357771.pdfIn PDF document text
    • http://terezszilvia.com/images/uploaded/file/viritodutupekijidaw.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161333a81c18bd---pefazepidadamokirex.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/fepewanuvesonuzam.pdfIn PDF document text
    • http://tangiahoang.vn/Images_upload/files/jedotuvifak.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/45344893999.pdfIn PDF document text
    • http://vilniausgreziniai.lt/userfiles/file/zikug.pdfIn PDF document text
    • https://www.sudoku-cool.com/ckfinder/userfiles/files/20487197927.pdfIn PDF document text
    • https://immobiliareincentro.it/allegati/file/14767065212.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614429c708b26---wodiradusurapasa.pdfIn PDF document text
    • http://ventexevent.se/uploads/file/37990917187.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/e8d6e18ba346ea55474cd4a91ceeec95/sifodesupaviguzal.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/wewomowovimuki.pdfIn PDF document text
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/87997116131.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161379cda5f2f9---62782786490.pdfIn PDF document text
    • http://encino.kopanramen.com/uploads/files/wewamezegilupeve.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/75636389794.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/15860332472.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/96a00e05e2f8ebcdd5f4aa57f9e3dd6d/30181217063.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/wazivejidukamex.pdfIn PDF document text
    • http://dongduong.net/Images_upload/files/teloziwogakejo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=feynman%27s+lost+lecture+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_off0000b998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB998 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1AA 16336 bytes
SHA-256: 12853c5638e0494e279d84bc04aedbd221bc2faf146d9b1899d7c70f56a38f24
font_02_sfnt_off0000fba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA2 10912 bytes
SHA-256: 935b72a73ad25d17185c7e2e56cf8e6b53c3395ac8be6be468a520b02ca8763d

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