Malicious PDF — malware analysis report

Static analysis result for SHA-256 9683d30b0c3ae882…

MALICIOUS

PDF

82.1 KB Created: 2021-09-16 15:31:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 508f2e025f63cf6b9077bbe54922c178 SHA-1: 9fced42e1daabe8d1cfd74bb21b28c0851664430 SHA-256: 9683d30b0c3ae882b25f700ecffe3ae76b47781b8f17da1ff9cf8d22c17a6933
196 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which appear to be part of a link farm designed to improve search engine rankings or distribute malicious content. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document attempts to trick the user into installing a browser extension or update. While no scripts were directly extracted, the presence of multiple external URLs and the nature of the lure suggest the document is designed to lead the user to a malicious site or trigger a download. The ClamAV detection further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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://nomylo.ru/uplcv?utm_term=play+store+not+showing+update+option PDF link annotation
    • https://big-affaires.com/img/pics/files/84972093499.pdfIn PDF document text
    • http://orlickachata.cz/files/files/9975099228.pdfIn PDF document text
    • http://chukgoobok.com/files/fckeditor/file/podasixefususabikobatowur.pdfIn PDF document text
    • http://buyyoutubesubscribers.com/ci/userfiles/files/difikevuwarizebejuvil.pdfIn PDF document text
    • https://highrise.pl/file/66352307007.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/f2ca759065df43595c138446025232b1/lapapapikumojovul.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/88381516453.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16133a7f9f1e83---91213283596.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/22d4d7eb74f905822edf404c329043d8/43507364431.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/demoroforojeredo.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b53094cbb4---jaburewakepegupotazijex.pdfIn PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/48509583041.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/32829975961.pdfIn PDF document text
    • https://praktijk-fix.nl/userfiles/image/file/32188096449.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/66764658675.pdfIn PDF document text
    • https://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/73668171648.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/71373456786.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/lapul.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/58cn1e9rerglsmfr7n3lintmf9/tolubalulane.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/poxorova.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/segalarajunimigonus.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/27256777950.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/34078946450.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/56165251563.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_off0000d993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD993 18336 bytes
SHA-256: 7b0336bdbab9cf5a24400a81c661a708c655c36bdc7a2d36bc78714d47a728fb
font_01_sfnt_off00010927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10927 10972 bytes
SHA-256: e87faf184a6f68fc73f68b56ccdb318a8b5122f980e3dffbed57fbda6d9fff97
font_02_sfnt_off00012278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12278 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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