Malicious PDF — malware analysis report

Static analysis result for SHA-256 02435b316b02a490…

MALICIOUS

PDF

82.3 KB Created: 2021-06-28 18:44:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 223aeb5f3c49adbe80a140747d94bd02 SHA-1: 59da2b7c14aca4f22187dd9e4f4bf8e4f756c064 SHA-256: 02435b316b02a490c57ac112dd819eda2d8636c8239df95c843ca8bcd467d537
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains a link farm pointing to numerous external URLs, many hosted on domains associated with compromised CMS uploads or identified as disposable hosting. This pattern is typical of phishing or malware distribution campaigns, where users are lured to malicious sites via seemingly legitimate documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/87183549593.pdf In PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071194ceeef0---38371155861.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/vidiruvevofe.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/jh42dkan33ihpgcj34f8frj2m7/46676229161.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/ec46ae7e68b86b2fbaa21bf09ea45560/nudubafovuk.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210626110315.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/kerufa.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b66cce0f3e---gasidivologuliwib.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/66456845272.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/30908748551.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160955ccf8cd2b---73279957813.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/jqnudvbod8g2hik56ri323s6ni/66579785894.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608491a776cc2---furojazezesegejilalabuw.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/b379ff5b8a7ffa2b5dadc81396fd92ab/29412248355.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608399478841d---raremovoxejagekeximov.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160815a0b648b9---91972954780.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2c76f30d5---kufupukanatekulox.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b406fcc9a1---42928678879.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/novelu.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/wowiposewosevowetijudon.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/7fh7csqo1vn59vtcc6vp6g0d2j/vixuj.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4416e131c---3789393853.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/zadapakekemukarinofi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=drop+in+onPDF 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_off0000e39a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39A 16888 bytes
SHA-256: 21e0682471f19539c887455955c6eb799ecdb301da6ffdca61acddcc67a352ec
font_01_sfnt_off00010f72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F72 9640 bytes
SHA-256: 5b652e70c3c4c235afa8506d9c09253614bc87aebdf85526611843389fb0a0e1
font_02_sfnt_off00012452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12452 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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