Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6318750c383d50f…

MALICIOUS

PDF

101.8 KB Created: 2021-06-27 00:08:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: e27bc06f8a9f6e715ea549596150bfff SHA-1: dc9fe0b4446ac93b1ecc79818ec20e333960c987 SHA-256: f6318750c383d50f7810b187eea2f7f2f9e404d421b56daffb6508dd642efcd7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress upload directories, a common technique for hosting malicious content or redirecting users to phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the link farm structure suggests a role in a phishing or malware delivery chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607edef424ff6---rizefanixajewepetumomekof.pdf In PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/40312881853.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/1746104476.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/3b4e458ba4bbe832d1ac6930ee5849d5/temewavukijizotepez.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/fuzowukufosonebu.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/56669468164.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/likexuvasugedetadeg.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/91597411726.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160741ca96b278---66283711756.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/fovumuzazorewetidapuz.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160adc44806752---53160352594.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086160465bb4---wowenufizimegu.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/f93940e4b84898638f275f0d8a1ec555/kokevexaxudep.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/58789314196.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbbd440ec7---76771429842.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863492a60f2---rizoxav.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/b5ebb5ebc03126808863f1f7260efdfd/10523011557.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/kr3rl7mujm88ev2hkgcu0bsgd6/zuwanubovuriju.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/93b992ef376a7fb3cfb08c5de60aa360/negonawokelos.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/xaxixokapemanirazop.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/8c66f147d0fec8ddc4df3dd946fdf5e0/37081199660.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/8da25adee3a905e6d3bee938f216ea55/xijasanisafowelabekuloja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=five+out+motion+offensePDF 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_off000129ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129EE 18244 bytes
SHA-256: ffbe8672a0f68342dfdb71d0d00e17cd805cfb1129d47805b6e14d0917ff3bd6
font_01_sfnt_off000159c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159C7 10208 bytes
SHA-256: 9cd956ffd86cbd8408f73c837cb925a531b4d0e95a7add5616966dc708568fda
font_02_sfnt_off000170b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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