Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e607c501e049b5d…

MALICIOUS

PDF

88.5 KB Created: 2021-09-05 03:13:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: fff4936ab53a576253aea1a4a2a2ee03 SHA-1: f32f453519fcd6932fcf7f770809af8f053c1e3d SHA-256: 3e607c501e049b5dd9e2d8501cc8f07671a337370b9d3225e479164eb897b698
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://menuiserie-sainte-anne.fr/userfiles/file/29158570399.pdf In PDF document text
    • http://www.lnk-creation.fr/upload/file/sofulavafimesexojumuwof.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/nimagagerusojifezolut.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/46487899695.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/219569385500cdc813cefc95ae16eb08/siwukofaripu.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/19084575800.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609274385ae50---39950285911.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ff0a3b28bc7---51542902122.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720b7fda9cb---poxaritulesuxukidunuvisid.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/zuzoferot.pdfIn PDF document text
    • https://rlmahtani.com/userfiles/files/detaluvaja.pdfIn PDF document text
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/28287599574.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/pekoginew.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/pidowoxim.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/xokixipedudoxejunotiw.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/69622037994.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/67835266958.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a98164f2f---70275857835.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/vakobiwonenirorar.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/toxemafugamedonurapab.pdfIn PDF document text
    • http://ekstelekom.com/userfiles/file/85643478347.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afcf731aee0---73889625655.pdfIn PDF document text
    • http://energosol.pl/images_cms/file/bunopumemozi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=curriculum+vitae+pdf+da+scaricare+gratisPDF 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_off0000f485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF485 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9C 10936 bytes
SHA-256: 173396e9222571f49e673788ce4c41cdea571fe65949573d914c690e99bf93ba
font_02_sfnt_off000125d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D0 17696 bytes
SHA-256: 69f45a23b71ca774712ee6ccaa524cf94d2e995791ef320c3726366896481ec2