Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b8b1200e9da74d8…

MALICIOUS

PDF

83.3 KB Created: 2021-09-12 18:24:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a3387ea7315ad3be026050961f7a60c3 SHA-1: 90db91ecbfd7c0b07954d7da7721812edf58d1aa SHA-256: 6b8b1200e9da74d881df7008114dce906dc8bf9d5387dcb08444b3faf963ff6f
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of a link farm is sufficient evidence of a malicious attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131ab8161ce7---sumosotisofuzok.pdf In PDF document text
    • http://cobe-ing.it/userfiles/files/wezumoxegozupitopobiv.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/47402079080.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613682c29c106---35436717182.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/kuxawevubawefogelarebub.pdfIn PDF document text
    • http://eszixv.hu/ckfinder/userfiles/files/61707972318.pdfIn PDF document text
    • http://phatnang.com/media/ftp/file/kijote.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/gaduk.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/24872183290.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/090146597836.pdfIn PDF document text
    • http://taaltoetsvo.nl/userfiles/file/bizofesamijodimawiriguv.pdfIn PDF document text
    • http://suriyedostlukdernegi.org/image/files/24137525517.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c7652aa2d---88234662493.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/wokuvitubulowiresa.pdfIn PDF document text
    • https://confidence-ist.mktechsol.com/ckfinder/userfiles/files/70868481187.pdfIn PDF document text
    • http://synowka.pl/galeria/file/6025858324.pdfIn PDF document text
    • http://oldadmin.k12cart.com/media/files/fikelinepi.pdfIn PDF document text
    • https://ingatlanfelugyelet.hu/uploads/file/rodaso.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/30363603185.pdfIn PDF document text
    • https://viadagio.be/userfiles/file/13355083504.pdfIn PDF document text
    • https://topupdana.com/contents/files/46782705283.pdfIn PDF document text
    • https://oreopay57.com/ckfinder/userfiles/files/jitoxokusisademazabosug.pdfIn PDF document text
    • https://grootformaatspandoeken.nl/userfiles/file/kelajotafopibonoredijisum.pdfIn PDF document text
    • https://sitarasign.ir/data/file/lisowepegixogesu.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/94445628982.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/161306c0959d47---10680016999.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=android+material+icon+setPDF 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_off0000df58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f76a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76A 18172 bytes
SHA-256: 300effc70ed955fd3c6f0008106217c96a9939be7524751df9bbd8a91a8fca8b
font_02_sfnt_off0001275b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1275B 10512 bytes
SHA-256: 7d695dd2cabed785b6c4e279223217cfd2dcfef857d6b6e5834713f9d85705df

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