Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b4a7f50b8a0d95f…

MALICIOUS

PDF

85.1 KB Created: 2021-07-08 10:29:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8209105eb3d324354f519778c0c46fa0 SHA-1: 9141c1e440578520c7e600282aa272a41a5be501 SHA-256: 5b4a7f50b8a0d95f85ee8842471a4f03cacc3286921c0c99c3a46df2d200dc32
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to external websites, many of which are hosted on compromised WordPress installations. The presence of these links suggests an attempt to lure users to malicious sites for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5498092a8---tezevi.pdf In PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607881413b37b---kiveni.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/zimizipazopogetoritobuvaj.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/fomulidogudasunivif.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/risifiva.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/69eb3f43c20cab4cb296cf343c677664/34562959666.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/1f2sruo8gctpsav6lhivi099q4/sojixezaruzupovabepuzel.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/walifipo.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/pakixilokebup.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/8717amhfd9mncqk2dtsrctcja3/35890691359.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/5if7k334s1nuji5rheioo8p6dc/zibigejujifafepasen.pdfIn PDF document text
    • http://tw-go.org/files/29689753.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/demufipasevan.pdfIn PDF document text
    • http://vhs1970.com/clients/873287/File/31538587361.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/589e19fdf1bb11b1fef45ad9225194dc/13663906364.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/6508519073.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607161d64f3a8---50834023226.pdfIn PDF document text
    • https://btegypt.com/file/49455839712.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160dbd0bba88ed---sobeka.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e8517ca4c---18930894451.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/mogamab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=dollar+to+rsPDF 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_off0000ecc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DD 9772 bytes
SHA-256: 44d022cdb75a8b00cfa587a53b51631401018048295a7bfcbb73c9f22a0670ea
font_02_sfnt_off00011a61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A61 17352 bytes
SHA-256: 69d9e3f381d09830aa0b834d08d42df29f20cc3881ad70940e1bbc1a9917dd9b

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