Malicious PDF — malware analysis report

Static analysis result for SHA-256 67667bfbd999278f…

MALICIOUS

PDF

87.9 KB Created: 2021-09-07 14:27:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3571bb1668f23d1590ae2c24fb2e916f SHA-1: 3c1bc48bfbaea471fa887e4bc2c66b9b15b925ed SHA-256: 67667bfbd999278f517ca721ebd2ee82a96277d0b307d8036bd8b2e0ed038fc5
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary function appears to be acting as a link farm, directing users to potentially malicious content hosted on various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b04925891e---gegovikabewaxafoleropu.pdf In PDF document text
    • https://kibledergisi.net/resimler/files/wudiwowuzitu.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/gifuvibov.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160a74c772f4b9---17489225592.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/1cf271fc3aa62008304734f9c7e82ea8/kemapojibafalawurumovizon.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/sevoxuzapewit.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/dedav.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/9404af5207d9e77f3ab14bc24f69bdf6/sisax.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee95b95cd1---42474191148.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1aae8aa10---99787662890.pdfIn PDF document text
    • http://praguetransfer.com/files/file/vefenobufazuviko.pdfIn PDF document text
    • https://nusbetaja2.com/contents//files/84671009730.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/50643349293.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/1418758503.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210707_40B6C0D82173D1A6.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f2ae85cf1---28749020415.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf1d257e6e---nesafuz.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/pf7uv2qdg895s82ivbfeblmofo/virepogujapizenatixo.pdfIn PDF document text
    • http://anpharma.net/upload/files/26506323296.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/96565760134.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/69196926761.pdfIn PDF document text
    • https://emmaushuis.org/pages/lomuvogolewoja.pdfIn PDF document text
    • http://liffeyartefacts.com/fckimagefile/file/muzupudajijerifanivafiv.pdfIn PDF document text
    • http://chinawin-consult.com/userfiles/24522147439.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=gilera+fuoco+500+owners+manualPDF 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_off0000ec7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7A 19564 bytes
SHA-256: 9951ec236635b8ab6667e65c60d55743895c71d7e3b222d0bbff03044fa1d492
font_01_sfnt_off00012087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12087 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001389e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1389E 10880 bytes
SHA-256: 75de6855a411b3fbbc1270d8e8c7af3382183d01c3aec484452264fed5c88575

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