Malicious PDF — malware analysis report

Static analysis result for SHA-256 7731ffd91321c428…

MALICIOUS

PDF

93.8 KB Created: 2021-08-21 09:55:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0f0dce18c54ef07dadd9b92f70fa4dc5 SHA-1: eb70c065120005907dfaa6f0b2df7476f82a74a7 SHA-256: 7731ffd91321c428c57ca7201f991599ba2e99a1e23aea8152d006ef59d7a6d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to compromised WordPress sites. This suggests a link farm designed to direct users to potentially malicious content, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/483b4eec20584369f97217fd7b7de0e1/43378937971.pdf In PDF document text
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/nunoxiwu.pdfIn PDF document text
    • http://klientskazona.radeton.sk/ckfinder/userfiles/files/81255459606.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/8281bd1b2b6846d52c7af8e3ed485e15/tomovajavekof.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/levuxojegasanalev.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/31359467042.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/b83457ff68f281f5e3976fe3b4ca6669/wawibukimefi.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a37531c26---jasarapawubonawisirazuje.pdfIn PDF document text
    • http://uctodane.cz/UserFiles/File/67020850016.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/lufibodazuwusujirezimaj.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/kitufisefolidarumutufe.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/fazemuwusujarogizofidog.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be0fcae6e52---wejuwowemas.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/8267062ed09c291ebdc1e17e9c2b05b9/jexutawunedaromevesek.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16077bb6bb4186---bugowokigenitinavina.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160861fa3db30e---zesotuwasanolutu.pdfIn PDF document text
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bd48e478bcc---jetalivelefamilajenoxu.pdfIn PDF document text
    • http://snsi.jp/image/news_file/verubodidudilajinipe.pdfIn PDF document text
    • http://sy-smile.com/upload/files/mifufirinetex.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/34035333197.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/b622bd250ca38c3eeb07703a5135e078/lufeborisum.pdfIn PDF document text
    • https://vmgeducationtrust.org/home/vmgedu/public_html/public/userfiles/file/bokojodinotaxukek.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-4-29/20210429030209398320.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=medicina+para+ardor+de+garganta+y+tosPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000e9da.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE9DA 19756 bytes
SHA-256: 1a2cd7a2f3f4a8d5a422659d95b31629501335905708abbc8e5aebd9775b30f1
font_01_sfnt_off00010a26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A26 17296 bytes
SHA-256: 3833551294d365cd28d3b506a69a3eb2f80c78d526addc81baadc752ce823e2d
font_02_sfnt_off000135bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014dd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DD2 10752 bytes
SHA-256: 362019f179907174f953129c6cf0edf1a16b4ec7677fa4298c9cdc71fd5bf003

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