Malicious PDF — malware analysis report

Static analysis result for SHA-256 6217841eb7d6375b…

MALICIOUS

PDF

83.5 KB Created: 2021-09-03 08:47:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 122cd17ef5d1f69fb314ba3e8423d662 SHA-1: f922a47a377c036077e7ca4519ca59e712b0ea30 SHA-256: 6217841eb7d6375b2de2991954b2e4a8de96387b7ee48718d22cd28a3acc6e40
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URLs are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://allytemp.ru/uplcv?utm_term=prestige+sandwich+maker+user+manual PDF link annotation
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608e363d3b9f5---vugokopisimabedavi.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607b37423ed4e---vurufulewedavotagevu.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/14038906189.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/lulogozukexezituf.pdfIn PDF document text
    • http://temple.mo/userfiles/file/silel.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/diloratijali.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/k8s2gdk8hskipso016ldq95q74/bebaxunofifin.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/zuzepufotisaxadimupim.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c011cdbeff7---bebagumaz.pdfIn PDF document text
    • https://stopserv.ru/files/file/majawavefupezis.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/sefijevusuwagi.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/dexipasejufawu.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/nulilewoga.pdfIn PDF document text
    • http://clubselectionvoyages.net/images/file/38606048464.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0be02b73b---nurov.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/vesujisazebutinamod.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/rijizowatevulirefarunozal.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/1339b8958bc52cab33398a2cdd478aac/77636463931.pdfIn PDF document text
    • http://siblom.ru/files/upload/file/11227216149.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/82250654134.pdfIn PDF document text
    • http://tweddlefoto.com/files_contenidos/upload/files/kapekodirixakonorolelame.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_off0000e0ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EF 17888 bytes
SHA-256: 8f163d7d29a52b62d4f3b47ed3e05915644b3372401a13a155d24e1005005612
font_01_sfnt_off00010f90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F90 10976 bytes
SHA-256: eccedd6f64b95b54c0530e89d2b87b156324be73b625045bf218f4abe919a01d
font_02_sfnt_off000128b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1