Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3509751ce4a9301…

MALICIOUS

PDF

74.6 KB Created: 2021-09-17 21:02:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b1b20072ddb34b622cd16cc1590aba4a SHA-1: 8fa794a6fe90bed029c9a96a9d5736b619b85242 SHA-256: c3509751ce4a9301f3515872cc603dedbaf7559ccdcd32c73b98690dfa2bc5ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics as a link farm and a phishing/malicious PDF. It contains numerous embedded URLs pointing to compromised websites, likely intended to lure users into downloading further malware or submitting sensitive information. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://smidgel.ru/uplcv?utm_term=common+nouns+that+start+with+p PDF link annotation
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/161433d1aba6e2---12454857184.pdfIn PDF document text
    • https://swaarm.de/app/webroot/upload/files/boxuloma.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/guwuwetewoxafovemoro.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/jubidofe.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613410f88e5f6---dorunemixisoxof.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/6ddae40e8d94563b7a91f40551559628/49635887603.pdfIn PDF document text
    • http://gotween.com/userfiles/file///patanuxepew.pdfIn PDF document text
    • http://lianbang123.com/uploads/files/202109010108501838.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/36f103e539bedddf8ec817b985bdcdb3/95829433207.pdfIn PDF document text
    • https://ip-kamera-rendszer.nuttydog.hu/ckfinder/userfiles/files/lopetevegotafapuxul.pdfIn PDF document text
    • http://hak-al.com/resimler/files/nalutivolopelamibuz.pdfIn PDF document text
    • http://tivati.com/uploads/userfiles/file/vapaga.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/fepomopubim.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/161397adced48b---19865400466.pdfIn PDF document text
    • http://szamosiszerviz.hu/feltoltott/files/dironuvomo.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/5169671973.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/27630169186.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/nuzixe.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_off0000c026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC026 10556 bytes
SHA-256: 5abc75733025e039f6f28b1e04f3ad28f6035f5722e4cda1f7e411c15d3af848
font_01_sfnt_off0000d81b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f02d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02D 17560 bytes
SHA-256: e7fd1b8ac04c35008bc5e970de27ebe5caf022ea607f24cbfa6fa2e0cb77db86

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