Malicious PDF — malware analysis report

Static analysis result for SHA-256 19ce81e9ecb26079…

MALICIOUS

PDF

88.2 KB Created: 2021-09-01 16:13:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 43668d948d1746441ec3b68927aa6725 SHA-1: 821b3605df7cbd518d3054d77e10b7ca81cc0923 SHA-256: 19ce81e9ecb26079ff36e6d38f46b225537d054e64f741624ef1af8e4866a305
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://pixomot.ru/uplcv?utm_term=how+to+find+champion+gundyr PDF link annotation
    • http://csim.jp/ckeditor/uploads/files/46246791342.pdfIn PDF document text
    • http://stonebriarranch.com/clients/876969/File/nifodosa.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/ff315b776bf1526e665e83065c3ec791/70183920072.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/wexofu.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4b46c3e7c---46862698111.pdfIn PDF document text
    • http://english-life.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff4bde9886---17387107909.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/fffe17ebb32316a2dbd0d596d3e36c58/makezotugilit.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160826386dcf56---zewaredikopetesog.pdfIn PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/15712748500.pdfIn PDF document text
    • https://partnermind.cz/images/files/62314103673.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210731_031643.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9075ed5aa9---67488926293.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/45973460252.pdfIn PDF document text
    • http://yameitecl.com/ckfinder/userfiles/files/20210710_110211.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/d00dd11a533d965f6c59a0c12ba4c58e/remimaviriz.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/ditekavuguki.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c742f72695e---21644414280.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/21732755270.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16070d1898926a---pupuxeratuwumezoben.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/94002da4d496efb5c26ee1ebac016268/kaxizupuloledotenuzex.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/tarupezojuvagosegazo.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_off0000f3b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B2 11012 bytes
SHA-256: b7cceae3396f1e1b0cfb7282438e80a17d33dabf4d6fa871e26eb967bd98890d
font_01_sfnt_off00010cdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDD 17696 bytes
SHA-256: 25b460f62eaf3495e40b751453bee5c2a4b8bf359efef951d8a1c9596dc06b03
font_02_sfnt_off00013afb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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