Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b3334940c34dc95…

MALICIOUS

PDF

82.8 KB Created: 2021-09-08 01:20:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 68addf51a180f82a14aed2041b6fa48b SHA-1: eeb01cec90c2cd2aec14320ab340bafe438f9e84 SHA-256: 0b3334940c34dc952dec46c4aa6117d77c5640cbafa6d0d9f73e535b2c432878
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads, consistent with a spearphishing attachment delivery method.

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 http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c3735dc97---setenisonomoz.pdf In PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6d10ec7edf---29527552879.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4ce5492c3---vexukunelusiwemoloj.pdfIn PDF document text
    • http://kolasinprevoz.rs/slike/files/4066886546.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210828101952891.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/63794873877.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fabizej.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161151130c9963.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/91118276862.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/xifefopafanaf.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16083fac4504b5---nizanubuwirukazogasesofo.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/edeb2fbd85d32b62e08d5a79069cf5e7/57171139547.pdfIn PDF document text
    • http://soupworld.de/upload/file/tolatisamoxoxomatotaxu.pdfIn PDF document text
    • http://statewideroofservices.com/clients/b/b8/b825a24af54c157c196cf52173d75bf0/File/fekuligukunituvesepazefob.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/dawum.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/gizolegugekenagifipevito.pdfIn PDF document text
    • https://mmszke.hu/files/file/82365377416.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a43d1a90554---68688207041.pdfIn PDF document text
    • https://carlojans.com/cms/file/dufakukoribeti.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/99efb15140f3a94b7d93900c4ec1c7b0/54933508520.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/18243565594.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/koxumatuwilebexuxokitewab.pdfIn PDF document text
    • https://xn--pssa17sw71b.tw/upimages/files/zeneferigurupewa.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0cfd5f9e4---pilalapip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=treaty+of+versailles+worksheet+pdf+answersPDF 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_off0000da19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f22b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22B 18940 bytes
SHA-256: c302528b4cd37ca3b5f4056d6e263ab63f7c9af7d538e4e6657ffeabdb4fe6c3
font_02_sfnt_off000123b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B6 10916 bytes
SHA-256: 55175da692a78883033610f45e10419a0215abc1ca7e10656ef2fccd32d450d0

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