Malicious PDF — malware analysis report

Static analysis result for SHA-256 409c15f4e85a7bf3…

MALICIOUS

PDF

70.8 KB Created: 2021-09-20 04:07:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 779a7944db9d8e04a2e0169e8a139d96 SHA-1: eb4e219ee352e1803be6586c6dd58464ee5c378f SHA-256: 409c15f4e85a7bf3321b18e6804bcc576091d375c1f2664eeadf4a59b72aff59
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate an attempt to lure victims to external sites, likely for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://huntic.ru/uplcv?utm_term=the+immortals+of+meluha+pdf PDF link annotation
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/zuzevirigixokibosib.pdfIn PDF document text
    • http://preiss.at/upload_files/files/terurozobivoje.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/m481lf84dqb1qeogua22pdqc8i/14849753330.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141f0e88c135---73904616569.pdfIn PDF document text
    • http://austria-ex.com/images/blog/file/tujiju.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/tivug.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/tudafa.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/40668994185.pdfIn PDF document text
    • http://one9five.com/userfiles/files/jezuzudatilebepadi.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/jelorefuta.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/214583140061436c470b8f9.pdfIn PDF document text
    • http://silver.jo/ckfinder/blanc/files/naropojisetumipo.pdfIn PDF document text
    • https://kipass.fr/userfiles/file/pirukonulowoxebi.pdfIn PDF document text
    • http://stevis.cz/files/file/rotamowuwe.pdfIn PDF document text
    • http://lpxs168.com/filespath/files/20210907061815.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/82435336966.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/9adf751992736ca057d3d28bf0036a75/wexozetepan.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/9ae66a80f82c854e889dc4fe82f09762/pupakenamabapotuzobevog.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/82197568237.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/golijigowotasamividu.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image/files/xalizapativineted.pdfIn PDF document text
    • https://egyediajandekotletek.hu/mvc/userfiles/file/kuzavomaturo.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/63864232800.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/21635976589.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/sorakupapo.pdfIn PDF document text
    • 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_off0000b5d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5D5 15260 bytes
SHA-256: 8c9df68fbcefc339c21553136543202594278fe581552d87daf0a0e81945c737
font_01_sfnt_off0000dc90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A7 10720 bytes
SHA-256: c4f47b6caf34fe37dc86e37d990d9de5a1d297a326d7a7f323aeee099dae43cd

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