Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fc92898cfea3e2a…

MALICIOUS

PDF

81.8 KB Created: 2021-09-17 18:55:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fb60cedd6e5738f595f7282ff55de8aa SHA-1: 949d387c3b2c2489f10ed54d2902af01bf524291 SHA-256: 2fc92898cfea3e2ab7c7b3e30fa25070e89bb35106006192e5eecbbb73e1170a
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 delivering malicious content. The PDF also contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://pistant.ru/uplcv?utm_term=ultima+versao+android PDF link annotation
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614037cfd1512---59691180378.pdfIn PDF document text
    • http://dsagco.com/Upload/file/vavema.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/beral.pdfIn PDF document text
    • http://crystaltrade.hu/data/file/zuradurikepebodamu.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140211f4a684---vawekiw.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/732e37d2585be8b61a6fd04e0a686dad/fatomukelewir.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/tawefevadavamumosakiwo.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/80904630883.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/16466711447.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021091116082598.pdfIn PDF document text
    • https://www.funes.gob.ar/ckfinder/userfiles/files/23877660558.pdfIn PDF document text
    • https://anninhsieuthi.online/upload/files/saxelakaruto.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/dudififakavivaxoligosesu.pdfIn PDF document text
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/riwuga.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/sugepikopovi.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/vupanem.pdfIn PDF document text
    • https://ciiinnovationsummit.com/ci/userfiles/files/12994019507.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/122550eef6088c7ba6c337613a7e1938/jamisugumabin.pdfIn PDF document text
    • http://edins.net/userData/ebizro_board/file/56584200409.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/7tqequ6qcuarve8lti6ok1m1dt/mofigabu.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/92732646276.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/31140146259.pdfIn PDF document text
    • https://i-intelli.com/ckfinder/userfiles/files/korogesefojepenomuto.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/farufibifunuzesuvugi.pdfIn PDF document text
    • https://jotelek.hu/files/file/23514793078.pdfIn PDF document text
    • 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_off0000dc70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC70 10480 bytes
SHA-256: 0274fa8c1e9a4b3cb954c87573b8ece8b6d2186c68764c039893350219eda183
font_01_sfnt_off0000f439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF439 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4B 17796 bytes
SHA-256: 74d6a57e4774d0e2e0dbad3a9c269c24cbd656cadd480e59f48d73f9bd6b979a

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