Malicious PDF — malware analysis report

Static analysis result for SHA-256 709c21bf43950837…

MALICIOUS

PDF

67.8 KB Created: 2021-09-19 03:53:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 50e684eb29c3711cfc94379f45674277 SHA-1: 67b7edc2a69023b060cb1db7f1058a60f71a1093 SHA-256: 709c21bf4395083706eaa9d18a8608db0526c17652ad5fabac226c295bea159c
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to malicious URLs, serving as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 https://snpwachq.com/files/js/ckfinder/userfiles/files/35675641420.pdf In PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/73541939926.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/f5d1a8f564e9ecbb2fb36d3ca1f0157d/83417568105.pdfIn PDF document text
    • http://tangneylaw.com/admin/images/file/janotefavedej.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/puxomuzobatamijusur.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/42220103428.pdfIn PDF document text
    • https://ladulceseguros.ar/noticias/fckeditor/file/vomumi.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/22677724258.pdfIn PDF document text
    • https://pima-alarms.eu/slicice/file/tegovare.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/830574624.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/70787118261.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/vavukujedabak.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/97461941540.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/563aeb3ad461d35a3889f3b49e23297b/4843578657.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1630838870.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e49b93aa9---detupufadasujene.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130c2ba9dc1a---suwakevovon.pdfIn PDF document text
    • https://e-midas.ro/files/file/82949788492.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/juzisedujiduvagofofosow.pdfIn PDF document text
    • http://fabriquetextil.com/js/new/fckeditor/userfiles/file/85599119928.pdfIn PDF document text
    • http://inannamsao.com/uploads/files/19741327210.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=android+studio+visual+studioPDF 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_off0000afc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFC1 13984 bytes
SHA-256: e383e8dbb2a05ac9ff59717ebf02895644eb66f7c37d7c5c2f72325750a34e71
font_01_sfnt_off0000d24a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD24A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA61 10256 bytes
SHA-256: 288a5480f9cc638949793bba5a8db39cdc93c114e55b4dad64750b7f66c4d79c

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