Malicious PDF — malware analysis report

Static analysis result for SHA-256 8eddea34e08730ac…

MALICIOUS

PDF

88.0 KB Created: 2021-09-11 00:36:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4dd55c458d882994df02272953a0829e SHA-1: 4f4d25f57310cd6914e4081d55d47e8ac23f5605 SHA-256: 8eddea34e08730ac74c3f03da743d357c10a2d3aeee9d6132fa898453605d3c7
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. These links are likely intended to lure users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 http://canavesiobruno-architetti.it/userfiles/files/1694500560.pdf In PDF document text
    • http://highdeal.linkeo.net/ckfinder/userfiles/files/gaxajajevolosebuf.pdfIn PDF document text
    • https://spacio.hk/attachment/file/nigoxokexoxosunupesapuji.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0f4b10ed2eed1cdd4a0e34d68172a674/5999904299.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/bojerikaxibuvilinefuw.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013/admin/ckfinder/userfiles/files/jafunimidibogad.pdfIn PDF document text
    • http://gz-chengeng.com/uploadfile/files/10047239361.pdfIn PDF document text
    • https://dom4m.by/userfiles/files/7117716522.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/zalipavakavixawekajigove.pdfIn PDF document text
    • http://universalgroupautos.com/files/others/70222223030.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131ffdb9728f---xogonitonejikesisap.pdfIn PDF document text
    • http://ucokampen.com/media/files/wiwikevaj.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a05b4a721---92060125211.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/togomopofapopizixitanuwi.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/47316385108.pdfIn PDF document text
    • https://isosklo.cz/uploads/1608961289.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/gataxobuzijebimidubapoduv.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/85146658529.pdfIn PDF document text
    • http://saringkarnwood.com/UserFiles/file/63801695924.pdfIn PDF document text
    • http://coverybox.box8websites.com/ckfinder/userfiles/files/sufijijufigenewoxirasapig.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/sokezebilulunof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=danganronpa+2+on+androidPDF 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_off0000e740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE740 10244 bytes
SHA-256: 76d49bff45268b3fe5131f5b59b6e7ff4b5c5e862b94c1a7dc8eb4764301c7b3
font_01_sfnt_off0000fe1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1F 23940 bytes
SHA-256: ff356ec74afb8f424ef9b5ca95c0521034b6c056726c475b09cb79ee22e044fc
font_02_sfnt_off00013afa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1