Malicious PDF — malware analysis report

Static analysis result for SHA-256 3738c350704a99ed…

MALICIOUS

PDF

81.5 KB Created: 2021-08-21 13:42:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 29edc789efbf9ffdf56ebc85992fbd44 SHA-1: 77eb006cedf7df8014b80c7a3f14c557627ad3c8 SHA-256: 3738c350704a99ed8a21d148f24a833e1aaf47dbe985fe761ac9bc7c171b7f1d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078d12b0cb19---80310869606.pdf In PDF document text
    • http://hnc2.com/userfiles/file/41347685353.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/a2c858840450e186a6afc278bd5752b7/lojukigumuximemu.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/femogu.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/fd3b639b6ab77bf044a7feecd4194a33/96096913345.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/ziwedebavojazega.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/m1nesqvhci6qdqnvhvm8o296om/86444342977.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/33529476319.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/67501193377.pdfIn PDF document text
    • http://bdn10.cz/files/file/44902224041.pdfIn PDF document text
    • http://esangsok.com/upfile/files/62569581267.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/ridunupusugusoboxe.pdfIn PDF document text
    • https://andrejc.si/files/file/zelokifumozaximef.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cda083659e8---forobojajafewamogasoxagi.pdfIn PDF document text
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/sizezewodebinak.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/59f30541dd4a2c1da6a007552f173ace/patonezosabip.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/197970301.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/138b7ffa767870e5f6ba0706417822a0/20909435364.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/jelujijebesinaworemezi.pdfIn PDF document text
    • http://veronikavilla.hu/userfiles/file/wixazibekibipetufap.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/a52a46d493ef0dd836a4356ca2802da1/1297684382.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=periodic+table+puzzle+answers+key+i+have+26+protonsPDF 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_off0000d84a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84A 16560 bytes
SHA-256: d781c40ea0cd9a7feb7bf172b07495f467fc027b37a0402898a8b257d6bffa98
font_01_sfnt_off0001034b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B62 11556 bytes
SHA-256: 0b77e27a4b91baed07bc0d98c6356b0e097fbc245a199628690e7cbdc6cc524e

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