Malicious PDF — malware analysis report

Static analysis result for SHA-256 8655fb151cd25146…

MALICIOUS

PDF

83.5 KB Created: 2021-09-04 14:59:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4747c104956d4f2514d17745ff0f47d2 SHA-1: 1cdc4f6e632dca7a099645bcf03261a10680b9b6 SHA-256: 8655fb151cd25146ca65c1ad560f230092180a9b98a121e5b62a329360e68946
156 Risk Score

Malware Insights

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

The PDF contains numerous links to other PDF files, many hosted on domains flagged as potentially compromised or disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond what the heuristics suggest.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • 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.
  • 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://all-pass.com/folder/editor/file/2521614732.pdf In PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/26078843126.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/fuzavoxevumalini.pdfIn PDF document text
    • http://maxkbm.com/clients/2/28/28fcaa936e2ecbeb6c9a97ea0f1ab253/File/wusosos.pdfIn PDF document text
    • https://onecre.com/images/content/files/85300934922.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16088c6e155374---gadiliguremexuz.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/6029b7a5f5cdf8215b71f48da1845426/38506660173.pdfIn PDF document text
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/78448410324.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/hqb5qs9cqkrs0esalobvh96s57/wutefojasudosawe.pdfIn PDF document text
    • http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/16665340982.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/kuguwuwujofazin.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/u97ntbqslamtag5rfhjciml9u0/49572572199.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/66571485174.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb8b12d11f---xezularat.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202108042104015166.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f43e63da426---46716415609.pdfIn PDF document text
    • http://belly.bpv.su/content/files/files/xemonak.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/33193478079.pdfIn PDF document text
    • http://ecole.ru/text/images/file/wutubiku.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/jefolezojojiwakobafezamo.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/vilomejuwuva.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1606e38c621283---31900618743.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/rozowije.pdfIn PDF document text
    • http://fuga-hotel.com/CKEdit/upload/files/94998426643.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/xabulejalesolapujene.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16078621deaa4a---pexipibakoxala.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=herramientas+de+corte+industrial+pdfPDF 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_off0000de73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE73 18772 bytes
SHA-256: 7b30f5b949f24ce64c5951744545723818602b0a67de413c2cc57a01d2c3eab7
font_01_sfnt_off00010ecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECF 10872 bytes
SHA-256: 1cc33f40383e925badb57a9f5bd4ea6de6176821595ec9260b1703f32e948c63
font_02_sfnt_off000127db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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