Malicious PDF — malware analysis report

Static analysis result for SHA-256 469f99f1209c2ac9…

MALICIOUS

PDF

83.6 KB Created: 2021-09-13 17:59:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3d123884dc6173ccee91125ec0f032d1 SHA-1: 9f9d71ec1dfd63608b92218502a9635ca2d9ca8f SHA-256: 469f99f1209c2ac99e6d9202aea1a8d1a35770bfa9a08f482cdca61865f0b6ae
196 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by a machine learning classifier and ClamAV. It contains a link farm pointing to various PDF files hosted on potentially compromised websites, with one URL specifically mentioning 'gameloop android update'. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content likely prompts the user to install a browser extension or update, a common tactic for credential harvesting or malware delivery. No scripts were extracted, but the presence of external URLs and the lure suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://coretry.ru/uplcv?utm_term=gameloop+android+update PDF link annotation
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613595e28bb4e---50417676566.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/zebobimopepipefej.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/94e494b4e041f9bbab08257ca68041e4/turexuno.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/62938063612.pdfIn PDF document text
    • https://rafautama.com/uploads/file/38447524544.pdfIn PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/48726510040.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/20824367810.pdfIn PDF document text
    • http://kavtas.com/images_upload/files/liwuvukawalinowojudatige.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/kozit.pdfIn PDF document text
    • http://gmtshipping.com/attachment/file/boguzu.pdfIn PDF document text
    • https://laatuwhuisweerstralen.nl/upload/file/wamepagogoxakin.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/jigubo.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/87422502041.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/77470868104.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/46490318985.pdfIn PDF document text
    • http://unibeauty.com.br/ckfinder/userfiles/files/zubezojokijiwome.pdfIn PDF document text
    • http://dlugopis.kbo.pl/ckfinder/userfiles/files/jowisafewujadeki.pdfIn PDF document text
    • http://debschoen.com/userfiles/file/34701438541.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/55899386820.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613506cc6b385---sesosogegevixudubo.pdfIn PDF document text
    • http://ukrfirework.com/images/file/vusakoxasavop.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/40273209147.pdfIn PDF document text
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/jamivik.pdfIn PDF document text
    • https://drjou-vc.com/upload/files/86626950347.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132cfc586b38---23559396737.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_off0000e223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE223 10524 bytes
SHA-256: cd8cef338907499794baff48a835a0f5da03f20a88ac44a362a71d722e98343e
font_01_sfnt_off0000fa01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA01 17800 bytes
SHA-256: 2bbde85fd210129aca22dfdf7cf568ffcfc3193f49ef4d974d515327d279008f
font_02_sfnt_off0001284d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1284D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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