Malicious PDF — malware analysis report

Static analysis result for SHA-256 56582a5540c2aac6…

MALICIOUS

PDF

80.5 KB Created: 2021-09-04 16:14:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a3f1a5ff4ba200fdc7e68047aecafd9a SHA-1: 95e3d5cc4532ecce9303a8b42298b11b67d9e8e9 SHA-256: 56582a5540c2aac675aa005ac2341ac75481d49b14e3cb3005f11292a9d55f65
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to compromised CMS upload directories and disposable hosting, indicative of a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly suggest this PDF is a phishing or malware distribution vehicle. Although no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings point towards an attack pattern involving user redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://allytemp.ru/uplcv?utm_term=reduce+pdf+files+size+mac PDF link annotation
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c8fd9bd75c5---badenopoxi.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/71602033599.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/b99a3b121ef702b9514f4aa29e88fc01/nalorejatinelukubavazubo.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/miwekike.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/72499464551.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cafb618b28---93838700404.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/jl2qsv6hkdnt7g7gl92vt2gal6/fedefipojileme.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1606c96bfe57f5---kovuxerelomovanonirob.pdfIn PDF document text
    • https://hse.tw/upload/file/juzabenivogajuzodifine.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/8sfmbhbplc23opuvg5cq4uop9u/52144490471.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606eeae002e2c---9786349270.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608433a5aee2b---guvawavajob.pdfIn PDF document text
    • http://goldway.jp/upload/board/file/fezujavaxubaxane.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/sitoxubotezigoz.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/59601327167.pdfIn PDF document text
    • http://sjatupornservices.com/file_media/file_image/file/juvigalajo.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/tuludujurabetasefe.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/69747371898.pdfIn PDF document text
    • http://gearcon-eng.com/file_media/file_image/file/22384203455.pdfIn PDF document text
    • https://marblobaths.ph/app/webroot/img/files/66403737072.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c92130c2951---piliteketotawaz.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105011037097051.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_off0000d690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD690 10564 bytes
SHA-256: 3866fc83abac282762099d5972f25a54cef6fa5a7b360c44b5ff004596cfb453
font_01_sfnt_off0000eea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA7 17444 bytes
SHA-256: ab2092c09d06f9a5084c5a3ba4fc3ae85a73c0de7235ea509a1f583c80e2642c
font_02_sfnt_off00011c53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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