Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc1aa76f00ee9d9a…

MALICIOUS

PDF

114.9 KB Created: 2021-09-03 07:17:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4c7633fd18fcf5c1375b67e82015152d SHA-1: b419a243bd4cc6108559ff9319840324f81a2076 SHA-256: bc1aa76f00ee9d9af788f0e9adfeab846118cafc6e6f6b7f1a5e7342f89eddd5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate effort to obscure the final destination of the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://sartoriaventurini.com/userfiles/files/fibuwow.pdf In PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6ebe7a386---13410504465.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608205c61c4cb---mujijiwomataboxewo.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e5d5d55a8---90865964823.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/tupodazubil.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/b9a8c8b59338d9c00380586abad95a79/73197085907.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/8cad8077fad1e14d3520ddc5245bce55/23857331687.pdfIn PDF document text
    • http://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/93715158670.pdfIn PDF document text
    • http://dermaktif.com/imgup/file/4953247939.pdfIn PDF document text
    • http://brenderup.ro/mm/file/butezofa.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610cec4ec56af---82497280328.pdfIn PDF document text
    • http://mtjjt.com/2013/upload/article/files/210724004717454641vkye1.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa76c9f06d7---95540733879.pdfIn PDF document text
    • https://xn--80aggmy8c6c.net/UserFiles/File/72126217995.pdfIn PDF document text
    • https://tungqibiotech.com/upfiles/editor/files/44414458682.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/8867868099.pdfIn PDF document text
    • http://orlickachata.cz/files/files/22394296630.pdfIn PDF document text
    • http://mcenterdk.ru/fck_editor_files/files/84182300976.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/34765799004.pdfIn PDF document text
    • http://life-worldwide.org/assets/uploads/files/72118941697.pdfIn PDF document text
    • https://gangnampools.com/contents//files/bapixo.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/b17fa5396972cfd3959e231bff59bbba/45643707314.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/77016872897.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/856a8a69b3f0c77c8c5f5bd84cc5f573/56134678825.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=ap+budget+2019+speech+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_off000159ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159AE 10960 bytes
SHA-256: c14fabfd3a5ce4a134e7364384f281e080f6edabf277a3badfc21a94c61ce6d6
font_01_sfnt_off000172e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172E4 19592 bytes
SHA-256: 28713ab2bd5d8583eda2ec27037bb9a21760de5ffc79abedaa08fa381dca1bd7
font_02_sfnt_off0001a572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A572 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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