Malicious PDF — malware analysis report

Static analysis result for SHA-256 061f553d9a0b1cb4…

MALICIOUS

PDF

92.1 KB Created: 2021-07-22 04:24:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1ff3117ac97f5484fe9383dbd9d51443 SHA-1: fd8e4d77391628bac12a46cb28305a9b4c0a4a2e SHA-256: 061f553d9a0b1cb41fa4d221ab01a5e98ffcf7be1d7e181f678d6f9b1f4ccf0e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to compromised WordPress uploads and disposable hosting, indicating an attempt to distribute malicious content or phish users. The document body is heavily obfuscated and unreadable, suggesting it is designed to hide its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/54333351033.pdf In PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/3s6rhmrrcno9b97pf0oin5r0k9/15305831016.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090e69581463---62994645020.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3654b0bd8f---rubesezekaxefubiki.pdfIn PDF document text
    • https://iwistw.com/upload/files/78631645408.pdfIn PDF document text
    • http://sshs1962.info/clients/3/33/33dcd814b32da85629335a95ab3d0158/File/72041868553.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/77739103660.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/47824196765.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/489fd57ea0057ca13793a9f6e2a9ef6e/36315462099.pdfIn PDF document text
    • https://estoniapools.com/contents//files/55136417278.pdfIn PDF document text
    • http://westtech1963.com/clients/d/d4/d4250bc21dcbbf02d7f9bc68df143add/File/salabunesulozabijevekewix.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087a7c920f7f---mogipuv.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c8890e1f312---53836673633.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a9ab09f9f---mulivewinederasifimibala.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/piliwumezeputesafibowaxaz.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/caed11035d7604887ecdba1c17a919f0/31675745482.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/38828136666.pdfIn PDF document text
    • http://greenearthgardens.org/userfiles/18630149957.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/gmb4ceovqba0d62kvcs2l5hhhi/39050066546.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/julubugusazosukawiga.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/13947673484.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=maximum+oil+pressure+in+the+lubrication+system+is+controlled+byPDF 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_off0001054a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011d61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D61 11228 bytes
SHA-256: 39f2307cacc9751d1653d67232f3c349b2dcb839dab0de57f190d4bf015c5b26
font_02_sfnt_off0001374c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1374C 16520 bytes
SHA-256: f65fba1badbb03a1a38f3a103fc80ed1d94207cba5dd03438b9ec4087c30bfc8

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