Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a2da47e2d38a6e2…

MALICIOUS

PDF

93.3 KB Created: 2021-09-06 23:13:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 930154e1965ab11cdb7e283c5ee3ff5a SHA-1: 014c41b46a577e90ebc7ad72f8d75d516a6cfbc6 SHA-256: 7a2da47e2d38a6e215c344e234bd420fb62567e26d0a1d29ed21ce41a7cbde7d
204 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm and uses social engineering lures such as a download button and a browser extension installation prompt. The ML classifier strongly flagged this PDF as malicious, and ClamAV detected it as a phishing trojan. The embedded URLs point to potentially compromised sites or disposable hosting, suggesting an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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 https://garglob.ru/uplcv?utm_term=geetha+physiology+text+pdf+free+download PDF link annotation
    • https://egyediajandekotletek.hu/mvc/userfiles/file/87977673265.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/12996938109.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/83252368500.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16096a8e3f1040---78715550014.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160a04c5393756---jebajagujedelivawenele.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8c9f39b39---78833333982.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/zijodo.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc3492db1e---misududukifuwevon.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cff27ae69b5---rajobabepofifosegolu.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/vogomi.pdfIn PDF document text
    • http://rurisnet.org/images/file/gupusezuvewogon.pdfIn PDF document text
    • http://furmanreunion2021.com/clients/3/37/3732e4fa3878e851f9d164dff32a9cbb/File/fazojorufuredum.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e39979c12---zepusotuvugomizezoge.pdfIn PDF document text
    • http://aweibel.com/Photo/file/82808865402.pdfIn PDF document text
    • https://qian-ho.com/upfiles/editor/files/zivukodavegogem.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/buxadepeko.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/81m5pcgvmkdsq9apfujla6qbf5/73085014898.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aab7914ead---gosabo.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/fonurawurodututukojipobo.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/c7e41e06a6d4abd7394625fb698213a3/38985562336.pdfIn PDF document text
    • https://zabulgaria.org/userfiles/file/fujasezavusixerexonepeliz.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/9935251300.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/supuzozafejele.pdfIn PDF document text
    • http://ventima.ru/userfiles/file/zewugapagalof.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/31699632211.pdfIn PDF document text
    • https://mmszke.hu/files/file/11284099038.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_off00010388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10388 11120 bytes
SHA-256: d8751d4b3cc3cf6c09f97c0374596ea10399542de6ababfc84ce0cb34af54400
font_01_sfnt_off00011d5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001356f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1356F 18968 bytes
SHA-256: e4e71856b0e11ac099d9e535459872171337ef0c018032ed4db7f31c4c40d489

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