Malicious PDF — malware analysis report

Static analysis result for SHA-256 84c4640cb416d149…

MALICIOUS

PDF

84.0 KB Created: 2021-09-06 19:54:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 136cbbdd13e98c0ada8b05c922c603a4 SHA-1: 5f1c400bfa2f7c12ca762f552b8b2480db0de8e3 SHA-256: 84c4640cb416d1496586f4eee98152c21ebe2a77e6e6bad05ebc89e477cacff3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a link farm with numerous URLs hosted on various domains, many of which appear to be compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the presence of a link farm suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://sona3elkhair.com/userfiles/file/zimuvopuwiborik.pdf In PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/66989518913.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210701164756332555809.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/8b4e983f4dffbd7eea309b97cfdd12b4/50725912266.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/q8uat0ki92p08uactfucl823em/73219068049.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/vajipakojowusedagelorad.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b1944ec66---mopekijopezusa.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/xudelawonepugatibusomal.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/51873471273.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/gumavisijekol.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/9ecf208f87933f26a59f77e36f237fa7/8171437459.pdfIn PDF document text
    • http://ipceurope.com/assets/file/tuzivoj.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/25320182421.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c31e3e501d---gutudikapikox.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca144ac45c---21425340716.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089bd809ad97---48818654007.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-4-29/20210429074928409520.pdfIn PDF document text
    • https://ladida.asia/sporlegen/administrator/imagetempfile/70870098036.pdfIn PDF document text
    • http://wirtrauenuns.ch/images/file/sokazexofometowudijupitaz.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/16qojrib5k70kbgo8c8t9v83e4/90401603129.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-6/20210906121038645353.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/8609889127.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a762a220362---30016783980.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161309cefcd77b---ziwodidikesidi.pdfIn PDF document text
    • http://duet-czluchow.pl/userfiles/file/73930278569.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/makowenutafememan.pdfIn PDF document text
    • http://vietthanhstone.com/images/news/file/vawusujodedogit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=yashica+electro+35+gx+manualPDF 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_off0000d72f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72F 11168 bytes
SHA-256: 9656e7229a30da7c073856c071119152951599e4b9eea100e75ceb4c5dff2844
font_01_sfnt_off0000f135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF135 21700 bytes
SHA-256: 684b9978d32b226bc6e82b6cc1775579d687a1af47d59d3b38a6ccc08649b962
font_02_sfnt_off00012a5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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