Malicious PDF — malware analysis report

Static analysis result for SHA-256 c92f5742b42cc4c2…

MALICIOUS

PDF

83.5 KB Created: 2021-09-12 16:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 793c7a18b228f56cf9e81e2220cd5516 SHA-1: ae0fabec8152ec4c5b2fcf6d1112ca2588617419 SHA-256: c92f5742b42cc4c216b0b309ada9519bcf12ab8603e4b8c4997e9a0fad9f7d96
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites acting as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to redirect the user to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 7

  • 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.
  • 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 https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/0e9386d14576a315ce57868ed7ade59a/98783483387.pdf In PDF document text
    • http://lnv-cnc.gr/userfiles/file/gowopulijejadopolof.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/galozo.pdfIn PDF document text
    • https://dreptultau.hotnews.md/upload/userfiles/files/72903782987.pdfIn PDF document text
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/22783287315.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/67077346962.pdfIn PDF document text
    • https://warungmimpishio2.com/contents/files/5181879586.pdfIn PDF document text
    • https://groupekineconcept.com/userfiles/file/jedewazefibafitidudiva.pdfIn PDF document text
    • https://patriciogaete.com/upload/file/89208442551.pdfIn PDF document text
    • http://vatlieubaooncachnhiet.com/userfiles/file/98288274874.pdfIn PDF document text
    • https://khonggiansachhanoi.vn/uploads/files/89986378851.pdfIn PDF document text
    • http://indel.sk/userfiles/file/darebuxaxokijozub.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/78818530363.pdfIn PDF document text
    • http://letnipohar.cz/upload/file/vomajurufufuladeruboxekav.pdfIn PDF document text
    • http://casaperugia.fr/userfiles/file/beturidudijomu.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/m3l0vi44fcdnfqbppfio8ehk5v/76564303192.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/1777451783.pdfIn PDF document text
    • https://degardo.hollandpazsit.hu/ckfinder/userfiles/files/kokanum.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137286ab16ed---69221139814.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/loxadategulidiv.pdfIn PDF document text
    • http://vasset.bg/userfiles/file/zavafinevidugumo.pdfIn PDF document text
    • https://isagrinio.gr/userfiles/xavidiketunigerep.pdfIn PDF document text
    • http://nena-artspace.com/ckfinder/userfiles/files/33853537399.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=facebook+app+not+updating+androidPDF 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_off0000e17a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17A 10784 bytes
SHA-256: 5f8e57cbdfbed12520694d3ea87b6727e3109b4224cf6c7996529903185ea474
font_01_sfnt_off0000f9fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FA 17932 bytes
SHA-256: 06312902116043cdd41d195e92aa9e1f82824476405e30c1a42977e90586878c
font_02_sfnt_off00012840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12840 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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