Malicious PDF — malware analysis report

Static analysis result for SHA-256 92cc67ec40bedb7f…

MALICIOUS

PDF

70.1 KB Created: 2021-09-24 17:24:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4ab135d9a6535023415c54d090d70ec3 SHA-1: 728c72f2567df6a1fc50511ed92f21e82a94b72f SHA-256: 92cc67ec40bedb7f5938a0b450d58fcf1c9fb615acd86ced6a2e1d5b1e60fd7f
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier strongly indicated maliciousness, and the presence of compromised CMS upload links further supports a malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://laborke.ru/uplcv?utm_term=how+to+delete+all+text+messages+at+once+on+android PDF link annotation
    • https://demircanticaret.com/userfiles/file/kigufedada.pdfIn PDF document text
    • http://lmtechsolution.com/userfiles/jinomitizigivaxegoxe.pdfIn PDF document text
    • http://saktigroup.in/uploads/fejivazobuj.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/puxilufabigepin.pdfIn PDF document text
    • https://yk-tech.com.tw/ckfinder/uploads/ckfiles/files/batofosufawugadazusanu.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210918185146_5luno1.pdfIn PDF document text
    • http://explosivedevices.ru/media/file/19776611773.pdfIn PDF document text
    • http://silarperu.com/UserFiles/file/sapirorebavekixiweg.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/6qrnho1jjsh86o5f7dp2a5vuc3/60057841444.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7591447f7---13786159034.pdfIn PDF document text
    • https://cosmopolitanhotelbg.lastrada.bg/uploads/wysiwyg/files/mexikinewefiri.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/20494188190.pdfIn PDF document text
    • https://akgoz.zemta.com/uploads/files/14748957662.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/3a90a099ec6c016823ea2b2e40c77a50/pekam.pdfIn PDF document text
    • https://jesssmithtri.com/jesssmith/ckfinder/userfiles/files/98636925061.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/zozepirojofes.pdfIn PDF document text
    • http://kencert.vn/uploads/image/files/nizepodatol.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/vudajunuwewidove.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/94505793344.pdfIn PDF document text
    • http://stmarysharipad.com/userfiles/file/samolinasepepagiren.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614095726a2ab---zijunaramemibafutijasafo.pdfIn PDF document text
    • https://crc.creativechange.net/ckfinder/userfiles/files/ketebigogorubi.pdfIn PDF document text
    • http://telefoonindex.nl/images/uploads/77270911640.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/kukopatekane.pdfIn PDF document text
    • http://jongauger.com/userfiles/file/17833088238.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_off0000b1bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1BC 15556 bytes
SHA-256: 0a26ab7f59d9f1982eebfe4689cf6349f7458c9e87591b756d9d468088eab362
font_01_sfnt_off0000d93f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF156 10892 bytes
SHA-256: ea155b96b1dca3ffeeedd5cd4a4bdb2f44816ea4192b4b6a321159c8d12262bc