Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0d511454023e1c4…

MALICIOUS

PDF

83.2 KB Created: 2021-09-06 04:54:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 79a0e6eac1488402f2dd4553bac924e3 SHA-1: ed7dfd4816887d8e3f68075346df283deba2e46c SHA-256: f0d511454023e1c4f0eb96ce7996b936782b3b60ffbe39cd12fb93c1a760135f
164 Risk Score

Malware Insights

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

The sample contains embedded JavaScript, which is often used to redirect users to malicious sites or exploit vulnerabilities. Several heuristics indicate the PDF is part of a link farm, with many URLs hosted on compromised or disposable domains, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/8chsipah46714571dks2u46mr2/fenodijade.pdf In PDF document text
    • http://petukmahaaaraj.com/userfiles/file/69206741097.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4f6a725b7d---zonesugik.pdfIn PDF document text
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/bibek.pdfIn PDF document text
    • https://ezastupitelstvo.sk/editor_uploads/system/files/77114087344.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/xukebugupusozelazepe.pdfIn PDF document text
    • https://unosms.us/userfiles/file/85964040746.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608be3374574f---mudikowepefeg.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/9ddffd3580b0014fb928a2cf99f50f13/dumowiravezabokuluwobas.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9e1f2c36b---rutilelorugofe.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/91270667603.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/zunezinenowexepadetubu.pdfIn PDF document text
    • http://vhshf.de/File/53758356377.pdfIn PDF document text
    • https://anakaygame.net/calisma2/files/uploads/88953553572.pdfIn PDF document text
    • http://20thhelicoptersquadronreunion.com/clients/71358/File/gakimulovadafaxom.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/ff17eeee192fa1ab0909aed7f4d63ff0/tumine.pdfIn PDF document text
    • https://duvarkagidierzincan.com/userfiles/file/65643304931.pdfIn PDF document text
    • http://www.alrafeef.com/faisaliya/js/ckfinder/userfiles/files/73292027122.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/xuselijagaranikiwavugep.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/7b38019d514fda71f934b735c35efbef/rutixewusuvakelabusu.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b62f5fd7857---18494783855.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609321432b0e0---tijabidofegixofoxizivoke.pdfIn PDF document text
    • https://coevent.ru/upload/files/13903076717.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/5288819e2d43c0a78c361cb9c5e31f51/mokowuketatutareted.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160976d06f3977---likodofuwuzo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=biblical+foundation+of+discipleship+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_off0000ddb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB7 10912 bytes
SHA-256: f7933fce24132874ff162bb77b3c68d92848ce3b9e9006c1daa18eac5a7e3114
font_01_sfnt_off0000f6b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B4 18492 bytes
SHA-256: 979be3528f3f68ea340695c012b955bf9a587d5cd6a2871ae7032817bf0278a2
font_02_sfnt_off00012660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12660 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1