Malicious PDF — malware analysis report

Static analysis result for SHA-256 d84da01c4f807589…

MALICIOUS

PDF

80.1 KB Created: 2021-09-07 11:54:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: b4099262cb4817e0ee04b6167980d7ac SHA-1: a800bf040447f8ea21b090edbbc27e0e2752d235 SHA-256: d84da01c4f807589a374920bc481144a105f1c35c55a738b7d7fb4a41e58539e
164 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to various domains, some of which appear to be compromised or disposable hosting. The presence of a 'download button' lure further suggests a phishing or scam attempt. While no scripts were extracted, the overall structure and heuristic firings point to a malicious document designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dataction.org/demo/dataction/media/nimijorixoxotude.pdf In PDF document text
    • https://pharmnet.cz/ckfiles/files/files/7599011059.pdfIn PDF document text
    • https://venus-forever.com/image/files/loputavofidetesudifemise.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/30144996016.pdfIn PDF document text
    • http://lidata.eu/files/55095883125.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/16341659613.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/wujutuv.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/34407975291.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/ad098f0d922a8a4f7d4efc2778d0b13b/jonewolaxunizeki.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-1/20210501023241980086.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/turavigoleninuta.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c274ec96738---13173119720.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607679b65777f---1486107860.pdfIn PDF document text
    • https://poulinstrapscan.com/userfiles/file/dunimozurowululupuzozo.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/bipezofelugejeba.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/72261012762.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160982b762fc84---gorikigelumos.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608614d6a3213---97976618725.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/49281419726.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/qj7j6eisiph2nqrofvb4k5lsci/wumoguz.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/69101179948.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/nimavejetomovelemi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=group+1+previous+year+question+paper+pdf+downloadPDF 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_off0000d2ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2CA 17792 bytes
SHA-256: a69096de1dffe05de13bbd31f8507de11e84f159d263124ebf6babc5b24a9390
font_01_sfnt_off000100dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DD 11092 bytes
SHA-256: c24f71f02f84dbef43da4ce5251ab901c8cd232d4e5d1a9154c72d09093b3ef7
font_02_sfnt_off00011acc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ACC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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