Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2bde435289b071f…

MALICIOUS

PDF

72.8 KB Created: 2021-09-16 21:16:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e7fc1b11f7486091ac36be04915041e8 SHA-1: 45265cf3885aa73d6b0bae70bab7aac7f07273e6 SHA-256: e2bde435289b071f3403eab90c972148a7e01cd5ae4de3398239fbfa3e524b12
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The presence of embedded JavaScript points to its potential use in exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://manisafar.com/basefile/marcosafarir/files/98571511305.pdf In PDF document text
    • https://likeevent.it/writable/public/userfiles/file/94544682134.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/70770749874.pdfIn PDF document text
    • http://fedime.org/imagenes/rarogixogedag.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/40479756393.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/manijanakibujofana.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321080d1486---92124382488.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/lhbf1t6vb6lp6rh5j0l1njt3bi/ruvejonoza.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/5249989938.pdfIn PDF document text
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210911015530929373h5z98v.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/1c0354cb925189461adaa5167b06a74b/30616647115.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/28164367587.pdfIn PDF document text
    • http://swotaweb.com/img/upload/file/vugike.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/ziduziban.pdfIn PDF document text
    • http://klaaswester.nl/img/file/vawusurudasupavovet.pdfIn PDF document text
    • https://insp.biz/img/file/dudabinirelu.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/lolozi.pdfIn PDF document text
    • http://pincesorvarshop.hu/editor_up/furubozopivekatowef.pdfIn PDF document text
    • http://goref.ru/files/file/13761034060.pdfIn PDF document text
    • https://foodexgida.com/uploads/files/20139606886.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/6915962111.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/21856762487.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/84714699941.pdfIn PDF document text
    • https://unitytradefze.com/ckfinder/userfiles/files/45314130615.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/xevagerojulabajo.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/zukikesatukaguxujusumoful.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=little+women+putlockerPDF 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_off0000b426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB426 10440 bytes
SHA-256: a373e3a85be91c5c8600c946d3ae05848b4c3c7ea6453b99a68c9ef9fcc28411
font_01_sfnt_off0000cbcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBCC 19308 bytes
SHA-256: 8a3c42474b18d795dd89d21d8e70cd0e08a2d9100279c1a8e66bb9597109fc8f
font_02_sfnt_off0000fda7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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