Malicious PDF — malware analysis report

Static analysis result for SHA-256 636c771a71d21373…

MALICIOUS

PDF

79.5 KB Created: 2021-09-05 00:01:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 098ec1d1e5c902226fe5071b889a873d SHA-1: c37ce6b728a1387ef1d49cb5c9e4d9a556123e68 SHA-256: 636c771a71d21373186e962f26fa6f4c7b22e30c70b2fb8482cdadb6ed36d7d6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The presence of multiple URLs pointing to compromised WordPress sites and a link farm suggests an attempt to redirect users to malicious content or facilitate the download of additional payloads. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca7c11ee10---77628170453.pdf In PDF document text
    • http://seigyobannkaigaikikaku.com/ckfinder/userfiles/files/moburolubabifibodoruxila.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/dkc70f2v7q2aadltbivvdv9lb1/62342615162.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/fanotofawudofiwadenezulax.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/sigasogokuzudosako.pdfIn PDF document text
    • http://unstitchedfootwear.net/files/file/44848124579.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608dfa8bb8b7a---zibib.pdfIn PDF document text
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/83348399886.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/96a61f17e73618a814c79fd5d396a722/85553292471.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/dofinenavuduriwavevomov.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e403651934---venibenonukavo.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/tolidufirisupiwu.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/be748fe82ffe577e12c82af73f98147f/zofogizuzigazinemewilun.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/xafisibedevokepav.pdfIn PDF document text
    • https://brincandoeaprendendo.com/fotosempresa/files/wofukalidozukupo.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/4u4bim80ot2f42cqgjeme36qiq/noginubajiduvovuregax.pdfIn PDF document text
    • https://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/faguxiligesuvifefole.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/trjk8mr8onlrht5lem5set8j14/90722106822.pdfIn PDF document text
    • https://xn--faades-mtal-n9a6a.ch/ckfinder/userfiles/files/91589016528.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/samiwudinoxusip.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a156635b38e---suxoka.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/vobadadeneji.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/9btd9rt49175vv6ga2l7j0clr3/67231362182.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=interactive+pdf+play+videoPDF 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_off0000cedc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEDC 10576 bytes
SHA-256: 6662f9691179d7e6033d8d5636d4953182978cd7d011a47bd467c406170e28e9
font_01_sfnt_off0000e727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE727 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF39 19668 bytes
SHA-256: c1c964817e7eab83f4949913582ce77938d51dede6b8a1466ec09ead12252951

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