Malicious PDF — malware analysis report

Static analysis result for SHA-256 eef889d60168f4fa…

MALICIOUS

PDF

80.9 KB Created: 2021-09-23 03:52:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: eb97ea6888ba6535042f8b719f5c975e SHA-1: 0ebc5b00896a3f1a205d87fdc631a87b4c2d059c SHA-256: eef889d60168f4fa1b883201b03b8d4490236221169e8b5e31c14cf4f404a914
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious sites. The file's structure and the presence of numerous external links strongly indicate an attempt to lure users to phishing or malware-hosting pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nomylo.ru/uplcv?utm_term=2k17+ppsspp+download PDF link annotation
    • http://sicilyontable.it/userfiles/files/28876091084.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/92559806187.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/73922618371.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/lalekilivokoxedugisiwagi.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/cc8afc39f077aeefd6f371e615d8111f/93318861747.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16136121a4df2d---pamij.pdfIn PDF document text
    • https://ijp2.com/contents/files/sisonufun.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/bfa0ee3709530e4cb4c412f3c03df662/mipaboxigajuwulivizavakit.pdfIn PDF document text
    • http://productinfo.in/konadnew/userfiles/file/repime.pdfIn PDF document text
    • https://komunalno.vrgorac.hr/files/39718682152.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/76292820979.pdfIn PDF document text
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/81763586996.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/5acfb918667aa6a0904d3923dd26178a/78093795532.pdfIn PDF document text
    • http://wedooverseas.com/userfiles/file/rokewix.pdfIn PDF document text
    • http://kronospan-mofa-hungary.hu/editor_up/wugufikexuxaboxesitoxeke.pdfIn PDF document text
    • https://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/lifasakapar.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/soranebebube.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/niwekukijelenemanemup.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/ditubegaxixilumimuk.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/pemubujekidef.pdfIn PDF document text
    • http://chamaeleon-produktion.cz/www/files/file/nonovaj.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/20176076936.pdfIn PDF document text
    • http://www.ambatownship.com/ckfinder/userfiles/files/melizinirokoxubo.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021091214452083.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/94812766342.pdfIn PDF document text
    • http://amdind.com/userfiles/file/92146332589.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_off0000d905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD905 17780 bytes
SHA-256: 0cc66938b24d9074ee22c4ccdab1b5c4dd1dec104435fb81b24918e6590c2269
font_01_sfnt_off0001064c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E63 10268 bytes
SHA-256: 7f655595751bf41f674175b3013efae96b45a947a3f8fca242dc3e094213ce5b

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