Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3a36c1c2ad7919c…

MALICIOUS

PDF

77.7 KB Created: 2021-07-15 20:05:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 366320dcfe49a864d1a92b02edc54620 SHA-1: a46a1f272dd38df1c52dc2f6085c3a9e105182f7 SHA-256: f3a36c1c2ad7919cb32a72540662bdb1b792d28706bb1545f3452b4ecc3248bd
96 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to other PDF files hosted on compromised websites. The ML classifier strongly indicates maliciousness, and the heuristic firings suggest this is a common technique for distributing malware or conducting phishing attacks. The embedded URLs are likely part of a larger campaign to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 5

  • 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://baodieptailor.com/uploads/2021-07-03/images/files/ribowipokozaratuk.pdf In PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/15022302936.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8b58ce437---rewulajafevif.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/q1uehufl4ievo7ma0upqp9shbn/91327925512.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/a76a9f38336930db5a5c9224850bc091/nutidav.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/siwilixarifupu.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/660iv9megtlmuvrt8t263j9koe/57885610097.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160705f5a61f2e---27636464099.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb416b7c62---59881341921.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/160906c9074e06---81397651160.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/f939327c497ba92d463a14a98bda9ea2/34667288042.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b412c300378---53639611294.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/betev.pdfIn PDF document text
    • http://sumterhigh89.com/clients/863574/File/47907263092.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/vatukox.pdfIn PDF document text
    • https://invest.pl/userfiles/file/87098257761.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/f7d2401fb577f5a3939ccadbcbf3469c/1392800825.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/7f012a002cd96783a0a52534eda5667e/97156034956.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/95ae9ed0cd606578af3a456cf42d9394/82541923553.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082b75b8dd67---52917252355.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607098dfe267f---17225612138.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cd2c27d72ae---92908130361.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b355b870150---doduxexikebewasopebuvol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=forms+of+poetry+pptPDF 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_off0000cfbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFBF 10208 bytes
SHA-256: 9797e306579001250b5629b5f43a2995f19d0d777c6a96ce100202a3e478a451
font_01_sfnt_off0000e6af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AF 16772 bytes
SHA-256: 2cf04e40cebac6611188fec913df032c13da7f86754d4246773c6eea55644160
font_02_sfnt_off000111ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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