Malicious PDF — malware analysis report

Static analysis result for SHA-256 56d154d2e8baafb9…

MALICIOUS

PDF

79.8 KB Created: 2021-08-23 02:47:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a35113ba50f916d2f1d7edeaff078201 SHA-1: 5100b46e0e8fd1618e0cd003a4ef6c8a2ff7eee8 SHA-256: 56d154d2e8baafb9e0b3354898235ce9506bee09d706fbac07f3d4276eab1e39
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The file contains numerous external links, many pointing to compromised WordPress sites, suggesting it functions as a link farm or phishing lure. The presence of these links and the overall structure point towards an attempt to redirect users to malicious content or download further payloads.

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://archism.ru/uplcv?utm_term=lego+a+wing+instructions+20206 PDF link annotation
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16093b342b6826---86476118182.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/jogixiposamepuso.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16096b46be29be---vowozoxugenawun.pdfIn PDF document text
    • http://simsvizag.com/contentimages/file/93525114730.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098d39eabf64---gobuzenipetiseguzol.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/9e2282c306513978e27706002c466172/94851542504.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/a97429db5192e62e5eb3169100205a12/poxar.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/be8a7378994816e9d3c1db41bdb36a25/68328636582.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/a0ff46059d20c8d30745153514249cca/xadexopawulo.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/56208192700.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/53d52aca02b2e63c3ab817f59af541f2/89504477393.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/0f8ea0a5568ca438697c5f16dbb7349d/penokazamu.pdfIn PDF document text
    • http://96rangjai.com/userfiles/file/jejisuribuzenit.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5d6fbd560---66844903670.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/08/09/5577903008.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/90282498000.pdfIn PDF document text
    • https://sibiucuratenie.ro/fckeditor/userfiles/file/raxiperulaludefexonogivor.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/9e6acf5ca6fb1854c8b6a2ce33490a9c/peralugizuraxaxivova.pdfIn PDF document text
    • http://intergeored.com/upload/File/83995551383.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ae12184feb3---paxatipurazexa.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///56981095482.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/rogizikobapanobazaz.pdfIn PDF document text
    • https://destockbaby.com/ckfinder/userfiles/files/fuvesedux.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4aaf923c1---2169496735.pdfIn PDF document text
    • http://duhochmis.com/files/uploaded/files/81272345841.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/87766617002.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_off0000caf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE310 10912 bytes
SHA-256: 4ee32699cdc2c9e76421d27e2fa18bdcaa4282df765d09ff8b55b0b10fddd45d
font_02_sfnt_off0000fc9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9B 20400 bytes
SHA-256: c94247fe2fa04db9a9e15b030728034da4fdee61a4c041050dc10fd143a986fe

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