Malicious PDF — malware analysis report

Static analysis result for SHA-256 69fb85ae824320d3…

MALICIOUS

PDF

80.7 KB Created: 2021-09-12 12:34:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4db192937b56cc03f2261c4a17407b6e SHA-1: b93e62fd768ea5fbce83084d6fd9693edc8c9d1a SHA-256: 69fb85ae824320d37379c432584e0ab065e79489dfe4f29974191ead7900b11d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to numerous websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://luxlustry.ru/img/upload/34230251054.pdf In PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcf13baf23---16929435624.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/mobalufi.pdfIn PDF document text
    • http://ilkemymm.com/image/files/niledapasopuv.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/39044968014.pdfIn PDF document text
    • https://ksdc.in/userfiles/file/69024376493.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/wirumisovurexurodikured.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/95580360553.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/aa396b22c8782ddf71288cf2615596d9/basidokusixejubukomuze.pdfIn PDF document text
    • http://kientrucsangtrong.com/plus/files/kisilojinetus.pdfIn PDF document text
    • http://ping-property.com/user_img/files/99608352121.pdfIn PDF document text
    • https://enilubricantvn.hoakhanh.vn/uploads/image/files/56487156732.pdfIn PDF document text
    • http://etcpremium.com/userfiles/files/20297973211.pdfIn PDF document text
    • http://limeitec.com/upfiles/editor/files/niwubipopelasofupagul.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/fcu7b274aqtiuec643ur7ge6n9/bisumalodiritowilozorup.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/nopupemetimoluxokowagokex.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613d834a55811---fovixaro.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/23264114821.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/ea0c1f98dd47189e2b22f0215468cffd/xowufutaxosuwib.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/gazijod.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/15406ae2b5ca1805de0eb0cdad3241d3/jitejaxe.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/fatuzivirun.pdfIn PDF document text
    • http://re-media.ru/foto/ck/files/89253103547.pdfIn PDF document text
    • https://motty-etai-sharon.com/files/files/lavoluwelib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=chat+heads+androidPDF 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_off0000d76d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD76D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7F 18172 bytes
SHA-256: 3df9ea4b33806c6084366fb38e7db1baa7848a20f7bdc86b4f98f603d1b022e5
font_02_sfnt_off00011e1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1C 10328 bytes
SHA-256: 179c4171c3ff56319191ca8234c8406248d38174e27fda13ad4a16ee3709b457

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