Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fd9d39a42bbba78…

MALICIOUS

PDF

82.8 KB Created: 2021-09-07 18:30:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 49d9117058aa17d8816938ddcaee4640 SHA-1: 73fd0af5416cc86dd984749044399361502cbf64 SHA-256: 2fd9d39a42bbba78db9bbce0a85a40a409140249fd48a9b91c93123118d663a5
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to potentially compromised websites, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://autosaloncenter.com/uploads/file/wupewude.pdf In PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160897067d891e---98484159277.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/5811538051.pdfIn PDF document text
    • http://www.climatisur.com/ckfinder/userfiles/files/kuruzenexemaso.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/wezasetuvanipoziladobe.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160897da5226ca---12050732536.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/74653563581.pdfIn PDF document text
    • http://bud-drog.pl/userfiles/file/pulirisu.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f185ab36be---19033985933.pdfIn PDF document text
    • https://bengalroys.com/ckfinder/userfiles/files/75217011181.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/9a8343752335944e2837acc85a35b6d3/sedidixonijisozozowe.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16079f844f4123---lumibexaxikowukisuta.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/05fccb713c5e035657ea2f8196e15cdd/bonolusa.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161233f4b5c511---nemufidorupewupebegine.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210826124941.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf880e7d63---9476223533.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/6fee4987600f30a96742973c471c260b/tezetapoki.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6d597bab3---kirilule.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/629i4rjvffneblln86d6mv4c86/rokutuzisetofo.pdfIn PDF document text
    • http://chronicles.ae/userfiles/files/71406715660.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2a92c431a---44443559321.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/6871776239.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/91198660418.pdfIn PDF document text
    • http://donghocasiochinhhang.net/uploads/userfiles/file/domofeguj.pdfIn PDF document text
    • http://agrocare.hu/ckfinder/userfiles/files/77510140183.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=honda+civic+lx+1997+owners+manual+pdfPDF 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_off0000df49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF49 16576 bytes
SHA-256: ec6fdce5bd54449c284f987cb4083a9e95c1df65a0a51aaf2e5cef5ba6a72ca2
font_01_sfnt_off00010a33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001224a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1224A 11296 bytes
SHA-256: 0d948fa9ff9479d416c4bc40b5684716d766d3f3148f992007a62e001e7b90a0