Malicious PDF — malware analysis report

Static analysis result for SHA-256 320bf5b4e5d80af6…

MALICIOUS

PDF

87.5 KB Created: 2021-08-01 13:04:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 89285fa44f84c1bc8e9a69af2f612b93 SHA-1: 5486694d5ecb501a44251e6a12706fe9e375c64e SHA-256: 320bf5b4e5d80af679491b885a2136b23343722ae8ef8fa6b6e9fd41525c16a5
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs, many pointing to potentially compromised CMS upload directories, suggesting a link farm designed to obscure the final destination. The presence of these links and the overall detection indicate an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://apoiotelecom.com/imagens/img_fckeditor/file/19141424611.pdf In PDF document text
    • https://literie-depot.fr/UserFiles/file/sisulitazavel.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/35994110714.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/98221541574.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/vepukivube.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/1bea0c010e3f1700e90cbaab3836eff7/bonalorekuzatokodomebiv.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/90090122475.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b2836393261---13031772850.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/16774871516.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/e4a82eefd098ca7230a4b78933fccc5a/vejamebikebenovumazanegid.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/51373419305.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1607018df14310---vinejope.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/46907942161.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/vodozewobititatolekewep.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/b4f1e5013421f2557fc7866f963c20fd/pujanapaneromasozikivu.pdfIn PDF document text
    • http://vipnovini.bg/root/f/uploads/files/morufovexatilagenibu.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/wexoj.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/cf73b6f22466d90badb761e9e46b4e5b/xevusumen.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b8d5aebf8b0---34909180610.pdfIn PDF document text
    • http://anjilh.com/uploadfile/file///2021042917444419.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6e8a2c6e1---lajazekufunigalovuw.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/jinumogibexefovere1620699278.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/000c2edb925837b14b6c50474fd677fa/zekolaxavasesiniwirotijo.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097acd28a366---ximufisagedonujutoto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=download+twilight+saga+2008+sub+indoPDF 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_off0000f217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF217 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2E 11072 bytes
SHA-256: b8f5af846a08e869434751850a2d26cb7758af2ddd0aa7bb979a1711d2d52ef2
font_02_sfnt_off000123c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C5 17064 bytes
SHA-256: 4c379f85c49baa21f1bbaf9c2b518946d1df4a7e2b3bec7c0ac559718638f2a8