Malicious PDF — malware analysis report

Static analysis result for SHA-256 a51ec2a02fd536b3…

MALICIOUS

PDF

68.2 KB Created: 2021-09-25 11:27:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 603e6b25f17a2071dae4f89d15ac6952 SHA-1: d5ff5bb1b2791a212627226825022f9d3ec67978 SHA-256: a51ec2a02fd536b3cc5fd9b862b45f03a853e38bd49fac344f5b371d5d515877
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, several of which are hosted on compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to external, potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 6

  • 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.
  • 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://etest.vn/app/webroot/uploads/files/jomigelasosaluteg.pdf In PDF document text
    • http://spartaksedlec.cz/spartaksedlec/userfiles/file/80330212201.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/7f79lktofno39ifb01rgco2u2r/sewejinofajulew.pdfIn PDF document text
    • http://transportdiverse.com/uploads/files/xemumidepe.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/fe7439c28e609ab7454b7bfc5f87fdc9/30119944985.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f4cc30544---toxogapovudexanibopa.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/sajed.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/sobodo.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/modaxipuxevibosuvow.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/7dae463d54f70d0d35d65fb609dc8d71/sifikototoxurulaw.pdfIn PDF document text
    • https://ontech.vn/images/ckeditor/files/54742483112.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/242613533.pdfIn PDF document text
    • http://descanso.verareyes.com/ckfinder/userfiles/files/tanomeru.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b259027565---78454339720.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/22110980125.pdfIn PDF document text
    • http://objets.immoweiss.lu/userfiles/files/gulopixokisalirusinusodap.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353af4888b3.pdfIn PDF document text
    • https://znalac.com/userfiles/file/23692325537.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7d90c72a3---64778599523.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/wegonoveg.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/7lkpe4g1ddrr0jk9q09e1ivq02/70460736901.pdfIn PDF document text
    • http://standdominica.org/files/files/rixexide.pdfIn PDF document text
    • http://sarigol.kr/userData/ebizro_board/file/mojeniwul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=io+games+footballPDF 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_off0000aec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEC3 14736 bytes
SHA-256: 2fd8c10d89010c793e93597cd72a7bed49692f2415207412bef0d1977024cca2
font_01_sfnt_off0000d41b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD41B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC32 10352 bytes
SHA-256: ec5a4c44f4d787c14908d52c703a2e31a7a0bf60cfaa5ce55895aa8655d9e41d

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