Malicious PDF — malware analysis report

Static analysis result for SHA-256 505160b09b0b093d…

MALICIOUS

PDF

71.1 KB Created: 2021-09-08 19:03:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 86ea66eadfec323ded46835ab8bf5d86 SHA-1: c9edcb3ab0b205a15178f9cd18e25387b1110f79 SHA-256: 505160b09b0b093d9ef5a384bded10e94af781df249509b7bd2c8be5b61941aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URI heuristics further supports the attack pattern of directing users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://huntic.ru/uplcv?utm_term=connect+the+dots+worksheets+for+2nd+graders PDF link annotation
    • http://fiorenzuolatrack.it/userfiles/files/78590270961.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/rolikakalubinunikufejude.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/vozifefir.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/52535206574.pdfIn PDF document text
    • https://pasifikendustriyel.com/userfiles/file/liwepivamigaz.pdfIn PDF document text
    • https://www.nbc.com.vn/ckfinder/userfiles/files/rovamasenetulizabuwepiti.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16130ceedbb19d---32358717606.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/20129916799.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/30230755732.pdfIn PDF document text
    • http://winso.tw/userfiles/file/kelogepazuwekikonuzow.pdfIn PDF document text
    • http://cmorshomecareassociates.org/uploaded_files/userfiles/files/64836148876.pdfIn PDF document text
    • http://rabotatver.ru/userfiles/admin/42423803226.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/654646af0d291bb92b7a6e723af5bca8/27834062879.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/43253695043.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/5dv518r776jnad56iogufteum0/2525819443.pdfIn PDF document text
    • http://kystar.net/filespath/files/20210903033437.pdfIn PDF document text
    • http://dejede.com/userfiles/file/43713548092.pdfIn PDF document text
    • http://schubert-hh.de/image/file/30845124566.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/gakisupozo.pdfIn PDF document text
    • http://instit.ac/ckfinder/userfiles/files/bedimenijuboroxuzis.pdfIn PDF document text
    • http://atek-ent.com/upload/file/tefenobuma.pdfIn PDF document text
    • https://biharlokmanch.org/userfiles/file/wawaxufidexosisu.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/35537881511.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/48292122704.pdfIn PDF document text
    • http://greenglobepms.com/uploads/20254756685.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_off0000b6db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6DB 15232 bytes
SHA-256: 0e606fbda7ab52f0b9b9691ab28087a29939a4cf42b11526622f6e40ca97ada6
font_01_sfnt_off0000dd79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD79 10948 bytes
SHA-256: 94f4a037852bcd47a456a549d58bb56e8033f965514df92f0000d5080cfccb97
font_02_sfnt_off0000f6c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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