Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf7218eeb6a016be…

MALICIOUS

PDF

79.3 KB Created: 2021-09-06 19:06:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 30bddf9bd47efb88293adb0a83cf682d SHA-1: bf805a0d08630fe5dc71675b15ee3115bedb7c97 SHA-256: bf7218eeb6a016befb654da79ea6b4f0f9b382a2efc053f34966cc67ae2e6907
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as a malicious PDF by multiple heuristics and a machine learning classifier, with ClamAV also detecting it as a phishing trojan. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The primary purpose appears to be to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://sbsoftware.ro/admin/userfiles/file/dumekiwuxedomorakofurab.pdf In PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16109f14c4bccc---wobebozemanuboz.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606efdc9e7019---76772228249.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/fotojevaf.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/xuzulofasozizo.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/wiresirega.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/gobefo.pdfIn PDF document text
    • https://ixiu-23.com/uploads//files/202108080015108894.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/72094244278.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16088bfceee8ce---1140747886.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/95692689093.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/81172701819.pdfIn PDF document text
    • http://grafosaleservice.cz/images/fck_editor/file/worunamigapepev.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/81327638359.pdfIn PDF document text
    • http://gucaoyun.com/uploads/file/101551094255.pdfIn PDF document text
    • https://cavalier-hundezucht.ch/userfiles/file/fidagatinexake.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/8399926247.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bb90578cdcf---33259862149.pdfIn PDF document text
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/21070812543757169127by3b.pdfIn PDF document text
    • https://bachson.net/upload/file/34730721710.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083339f96032---54338445857.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de101e8cb2f---kesusexuku.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/7c628e8509650df41ed9b78d503c9e5a/64165481353.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/gikopumewevipiji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=wpf+tutorial+pdf+with+example+c%23PDF 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_off0000ce2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e63f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63F 18484 bytes
SHA-256: 399234d4bea55f17bb697ccd54157ae4829d1d0c97c8cdad8a60e792d67fef3d
font_02_sfnt_off0001169b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1169B 10892 bytes
SHA-256: c157b94a9f648710d458ff286a32c57912cb4a1eac01ea0069be51a9f81d3b39

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