Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb8aa57c4ecf9a55…

MALICIOUS

PDF

85.5 KB Created: 2021-09-15 20:33:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b0f1d412b98f2b8a2eb8dd71624dcd9f SHA-1: 55789294e0ab9fc339fb46ecd438f8e873563925 SHA-256: bb8aa57c4ecf9a559f4fa91f01997d475418c24fba923fc9e3b9d14bd32c8293
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users. The presence of external URI heuristics and the ML detection indicate a malicious intent, likely to lead users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jshanwoo.com/ckfinder/userfiles/files/57806870947.pdf In PDF document text
    • http://esipro.be/userfiles/file/88359183976.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/xidofixura.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ced80ceb97---rexezumifafipukevijafus.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/2584388286.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/f7f88da8a130df423289ec2f6e9dc071/89579191824.pdfIn PDF document text
    • http://monthclean.com/uploads/files/202109090227154909.pdfIn PDF document text
    • https://ntc-container.com/upload/files/72855499562.pdfIn PDF document text
    • http://sm300159.agchost.com/userfiles/files/pajasivonafi.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/banikosubizukanetive.pdfIn PDF document text
    • https://strechybenesov.cz/content/52404878470.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/37229644804.pdfIn PDF document text
    • https://www.pollackmihalyiskola.hu/ckfinder/userfiles/files/41083633446.pdfIn PDF document text
    • http://conhantaoankhanh.com/webroot/img/files/xovamiwipuge.pdfIn PDF document text
    • https://majubesar.com/contents/files/26583498226.pdfIn PDF document text
    • https://path.mn/userfiles/files/24440020570.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/bakewatonaruzivive.pdfIn PDF document text
    • http://yung-shun.com/userfiles/file/mapenemivenofureroxun.pdfIn PDF document text
    • http://kamienneogrody.com/userfiles/file/91793498879.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/rojozegegefexuzasal.pdfIn PDF document text
    • https://cpsguffanti.it/uploads/file/61493569776.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/netugowumovivafupatevo.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/161414ccd2b627---36382549857.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdf911703f---burixosizizakumozelani.pdfIn PDF document text
    • http://agedwedfjtj.pretty-match.com/upload/files/34580485418.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/12435313717.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+to+convert+mp4+to+mp3+windowsPDF 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_off0000e870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE870 18036 bytes
SHA-256: 283bc43ceb89bfe58c1edd673e656b199dcbe237651a6b8db03d7d4cc28d6867
font_01_sfnt_off000116e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E6 10860 bytes
SHA-256: 55d513aef6dff349fb6411d5f53e92911d7b0bb8dfe7ea552ceb19f1c5ed88bc
font_02_sfnt_off0001300f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1300F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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