Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e8ec71e3fcc4bd7…

MALICIOUS

PDF

80.9 KB Created: 2021-09-02 23:33:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 631aa829f6692f9e394d5fe14e974751 SHA-1: 95b910868a22a359533ff76fe7d1255a83c30782 SHA-256: 1e8ec71e3fcc4bd745fa74c5b96ad7d285f160b8bf86c6a0a439d141bdfdc757
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to compromised websites and disposable hosting, indicative of a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload delivery mechanism. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://oniceh.ru/uplcv?utm_term=algebra+expressions+worksheet+grade+6 PDF link annotation
    • http://szpk.hu/_user/file/wijuwusovew.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/1f828a5b266eb171a7cedc63c2ecc464/jataxejafotoj.pdfIn PDF document text
    • http://gfzgt.ch/upload/file/63173449875.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021072814382229312.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/e618ec5663c415761903332be6d7e075/zimowitotijuxor.pdfIn PDF document text
    • http://rnralpha.cz/res/file/23754721174.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836691be948---lasifarefafevosutag.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/3c6cbd0aadd654aca01523d5621a8037/2017075025.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/1b6b636e0eb5511eb97e1dc15a868ca9/zipegalenobetowetunekusuf.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/37561324825.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/a190f73bd17cc77b35948953ca8187ff/9461513584.pdfIn PDF document text
    • https://mzlpro.com/web/img/podborky/files/zugaboxifobefu.pdfIn PDF document text
    • https://skillmapmagazine.com/ckfinder/userfiles/files/39692865541.pdfIn PDF document text
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles//files/lolewalofemudanike.pdfIn PDF document text
    • https://besi.co/ckfinder/userfiles/files/likuzopobarugonowid.pdfIn PDF document text
    • https://frontivo.ro/userfiles/file/gulivuzenalofepipojofow.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/43346209439.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/90945265230.pdfIn PDF document text
    • http://eva.am/files/10011d2226ced17a.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/vfa6coibkqc0alusiddapu9k1t/sopufoweneturugil.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160832d0cc3e28---lewuz.pdfIn PDF document text
    • http://candientuvibra.com/images/file/dugipi.pdfIn PDF document text
    • http://avtokit116.ru/!upload/files/72247409549.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aae53756a79---depumivu.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_off0000d74b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74B 11240 bytes
SHA-256: c83644ab2aa0df8501a896136fa8b5efb1db93b1c67fed3f311f4dcedd832e23
font_01_sfnt_off0000f13f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10951 17188 bytes
SHA-256: 3d363b26678940b1673563130a76782be7ded29b623b47fe5079f6c40e8553b5

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