Malicious PDF — malware analysis report

Static analysis result for SHA-256 6982d7de6cca8785…

MALICIOUS

PDF

83.5 KB Created: 2021-09-15 14:24:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 542ca02708d76017c9f34cd112d41274 SHA-1: ecac60a41a4e73e25fe8ecfa6c453a486e2325c5 SHA-256: 6982d7de6cca87853413715bf82afc2e017905e9e938dc5a4bb295b05dbbc39d
156 Risk Score

Malware Insights

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

The sample was identified as malicious by a ClamAV signature and an ML classifier, indicating a high likelihood of malicious intent. Heuristic analysis revealed it functions as a link farm, directing users to multiple compromised websites and disposable hosting domains. The embedded URLs and the PDF structure suggest an attempt to obfuscate the true destination and potentially deliver a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://chambredhotes-savoie.com/ckfinder/userfiles/files/juzegadubuzirek.pdf In PDF document text
    • http://kleinschadenexpert.com/userfiles/file/lefutiwasop.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140618029f1a---toxesamibuzatel.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021090811291483.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132fc8fe2f12---47571892646.pdfIn PDF document text
    • http://phukientubepxinh.info/gomsu/sanpham/anh/files/kipipibivewesela.pdfIn PDF document text
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/torebowere.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/vizixonufapatufu.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/kiwafegunid.pdfIn PDF document text
    • https://dptech.vn/uploads/files/62351307819.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/mofam.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/4167270925.pdfIn PDF document text
    • http://mathrainbow.com/userfiles/file/jewekorisemamefuj.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed86221f73---988209017.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d4db730b7---pizapofazudoriveb.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba4c33300e---57695856595.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/37151584752.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161393a3aa65f7---vikukabegulakawevil.pdfIn PDF document text
    • http://ha-sine.com/d/files/82266836310.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/18902214456.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/161403cb761193---2427950112.pdfIn PDF document text
    • http://hkbroadwin.com/userfiles/kigabopazosozenido.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/32438369851.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+add+live+wallpaper+to+iphonePDF 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_off0000e12b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF942 10464 bytes
SHA-256: 2741cc810be16c0146b34d6173a8a750685fd1227ff8174e04aa6ddf4de74fed
font_02_sfnt_off000110e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E7 18208 bytes
SHA-256: 3b117be6563a88a7c497c7f68ac0d2185b33e8fee2e88238688a0d91246088d6

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