Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fc4116db15042f9…

MALICIOUS

PDF

69.3 KB Created: 2021-09-28 06:02:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 7e5dd3f10930d2a83888e1b01ce6d207 SHA-1: ca5f39a2b468a15b4d53fcc84fc87334d95566c7 SHA-256: 0fc4116db15042f9a558c3180c887ea1e736c2f0c91a630255c7c91c6b5826bd
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm and a potential phishing or malware distribution vector. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://archism.ru/uplcv?utm_term=adblock+apk+free+download PDF link annotation
    • https://mimpishio2.com/contents/files/sezig.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/161451baa063ad---93880430723.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/mumifak.pdfIn PDF document text
    • https://inmaabiladi.com/userfiles/files/89100222767.pdfIn PDF document text
    • http://basse-normandie.annuaire-regional.com/ckfinder/userfiles/files/geferatawozatu.pdfIn PDF document text
    • http://drironcat.com/images/file/64005601766.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/jaxogu.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614e4a76ac33a---nifegonufu.pdfIn PDF document text
    • http://veszpremlizards.hu/_user/file/29267655103.pdfIn PDF document text
    • https://nikolsbeauty.com/webroot/f/uploads/file/83836785402.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021091109052973499.pdfIn PDF document text
    • http://stroytehcentr.ru/images/file/97089657484.pdfIn PDF document text
    • http://pomelieagency.com/userfiles/files/86934642974.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/9700ae44a4d93236f32faf11620a279a/29436153340.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/makozogidemiguxo.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210903235434_7u8mcu.pdfIn PDF document text
    • http://planao.com/ckfinder/userfiles/files/88901134522.pdfIn PDF document text
    • https://maxtarget.by/ckfinder/userfiles/files/90783485744.pdfIn PDF document text
    • http://knx-shop.ru/admin/ckfinder/userfiles/files/zomuluf.pdfIn PDF document text
    • https://silverbirdmarketing.com/pages/images/file/17956276477.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/xuxodu.pdfIn PDF document text
    • https://univerosg.com/ckfinder/userfiles/files/75034054114.pdfIn PDF document text
    • http://consorzio-csa.it/userfiles/files/vuvunowokazo.pdfIn PDF document text
    • http://sinorarechem.com/upload/files/92361733883.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_off0000b22c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB22C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA43 10556 bytes
SHA-256: 901a57a5142dda56262b810f22ae2a6cb5b7f6ae9e130f22ab4c5477c5f794b5
font_02_sfnt_off0000e246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE246 14908 bytes
SHA-256: 74ee5846d7530bb6cfc4a32d3ab3e92f3d2729f01e66328a8be2fe21555a8205