Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ef79dac4beed16a…

MALICIOUS

PDF

79.2 KB Created: 2021-09-18 23:05:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b7878d194c05a50233193d44ff6a2f0b SHA-1: f6b114b8315bc223730a42a15c29004fb91c7f06 SHA-256: 3ef79dac4beed16ad132ef8f307eae300a66e22f9b5021209b19af760a83f711
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as phishing and trojan activity. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the use of embedded JavaScript for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://archism.ru/uplcv?utm_term=how+to+change+phone+os PDF link annotation
    • http://ksiclub.org/projects/achievemore/admin/upload/fckImages/file/lipudorefowapataxaxugeb.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161418e58383e1---bolesitifetenavemepa.pdfIn PDF document text
    • https://webrekruit.com/php_codes/Scott/VieauAssociates/code/userfiles/file/narodesokavetulu.pdfIn PDF document text
    • http://akvatoria.by/UserFiles/files/50225526778.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/gibefatoja.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/zabujufopobapisebe.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303168e7b93---bikokutedared.pdfIn PDF document text
    • http://pmrs.ps/userfiles/file/vofojuvotimimezenede.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/43845292578.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/lojupe.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/94041554055.pdfIn PDF document text
    • http://irvine.songhakbbq.com/uploads/files/7542686198.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/79525069581.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/a3l6j1udegvu284qacr9h3ttgs/gedesopuwipusejopodiwewaj.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/kezetirudiboloreg.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210904121743_md4gx7.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/26215679480.pdfIn PDF document text
    • http://innotack.com/userfiles/file/fawawada.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6b249607b---97388486751.pdfIn PDF document text
    • http://thaide.org/userfiles/file/muzug.pdfIn PDF document text
    • http://olguanaokulu.com/upload/file/vupileviromonado.pdfIn PDF document text
    • https://testgit.begurholidays.com/uploads/userfiles/files/69355234401.pdfIn PDF document text
    • http://www.tecnologycenter.com/admin/uploaded/fck/file/vizalit.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16139a2c4b35fb---jilazusoronekap.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_off0000d168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD168 10492 bytes
SHA-256: 3cabfc3de4337fb402567d9e2e16af6a2114b325ae157be9501d3916666ad81c
font_01_sfnt_off0000e946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE946 17800 bytes
SHA-256: 43351cf67dde0ff679f32dfa1397ac1c67da0845b7209a6343f25749629b4421
font_02_sfnt_off000116e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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