Malicious PDF — malware analysis report

Static analysis result for SHA-256 3eb5f46a8c6d04a0…

MALICIOUS

PDF

70.5 KB Created: 2021-09-28 14:57:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b1da55b3c6558ad2854d6a6c4b82528e SHA-1: fa619302c198ddff49571714465aa624496026b1 SHA-256: 3eb5f46a8c6d04a0351c8e4dbd0ba71660f74c4e111571f68eb1b4e23da176f5
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites that appear to be compromised CMS upload directories, a common tactic for hosting malicious files. Heuristics indicate a link farm structure designed to obscure the true destination. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/161366d6d354b2---33475502665.pdf In PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142777a764a8---pelevujogimetinog.pdfIn PDF document text
    • https://812423.situshoki1.com/contents/files/44619640324.pdfIn PDF document text
    • https://sunsetlearningcenter.com/userfiles/file/jebisisapimo.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135cc16e0426---juzemovozevitik.pdfIn PDF document text
    • http://yoga-privates.com/yoga-privates/file/70231757876.pdfIn PDF document text
    • http://tatnhapkhau.com/ckfinder/userfiles/files/rukekosedelenuba.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/hhd591vh6mkilhjkcvrvaf05a0/nipotemiwobewezojegafilus.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/xetuvunakumake.pdfIn PDF document text
    • http://orderkai.com/uploads/files/butajazileg.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/rugovev.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/96992886087.pdfIn PDF document text
    • http://zekidilektekstil.com/images_upload/files/70269329009.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__615283F6A3DBE.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/58961320193.pdfIn PDF document text
    • https://jv-cms.crazy-jessie.nl/uploads/files/nisexirirewonu.pdfIn PDF document text
    • https://taucaotoccatba.vn/images/news/files/68448976131.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/jususarud.pdfIn PDF document text
    • https://eric-parnes.com/ckfinder/userfiles/files/walubefoz.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/j66vra3hk5mfkdgjq1g3ai24j3/dowetojexuwabat.pdfIn PDF document text
    • https://avphunter.ro/ckfinder/userfiles/files/1907270575.pdfIn PDF document text
    • https://rajatotogroup1.com/contents/files/ziver.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/f9d7be0523180aa62dca1a875c4ed30c/3638726658.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=redmi+note+8+miui+12+global+updatePDF 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_off0000b2e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cafb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAFB 11132 bytes
SHA-256: 6f8201406fca92fa06dcd1fd7d019a0e3e84951ab56206cdbe2aff0672809a0d
font_02_sfnt_off0000e498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE498 15824 bytes
SHA-256: be5bcef37cab81859f725b3fc053ed84b95b787e1c27a0add7041a5417b75450

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