Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dc7e5c37cc7fa4e…

MALICIOUS

PDF

67.9 KB Created: 2021-10-02 13:34:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 3ba7aba1bcfde904c72c3ca1e030f7aa SHA-1: e6de56fb02deb5b5df8a480cf72ce8bd216861ea SHA-256: 7dc7e5c37cc7fa4e3c7c6c9f585b5d0e8b53dc6f98453612bc329b655d8743ec
184 Risk Score

Malware Insights

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

This PDF contains embedded JavaScript and numerous external links pointing to compromised websites, indicating a phishing or malware distribution attempt. The heuristic 'PDF_IMAGE_LURE' suggests it's designed to trick users into clicking by presenting a full-page screenshot. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://catamma.ru/uplcv?utm_term=root+word+of+inconceivable PDF link annotation
    • http://weighlessthisyear.com/ckfinder/userfiles/files/53531110989.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffac4e4e62---rejijejat.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/37852710756.pdfIn PDF document text
    • http://muaah.ca/userfiles/files/wejivenelomejixex.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/ripurigosubaxawigitu.pdfIn PDF document text
    • http://myepres.com/HotelEstimator/userfiles/file/2103696427.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c04b72df99---sajibelud.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/76706704604.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/88709708598.pdfIn PDF document text
    • http://bapassamarinda.id/assets/ckfinder/core/connector/php/uploads/files/92560378525.pdfIn PDF document text
    • http://hexindechem.com/upload/files/85801236473.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/nuzarilarapoxelidasem.pdfIn PDF document text
    • http://phupmirpol.pl/userfiles/file/lekur.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/22120518299.pdfIn PDF document text
    • http://duet-czluchow.pl/userfiles/file/nosenepesejezumuverexoj.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/d064775f837c5afa25565ad038e35dee/29150743064.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/89682225824.pdfIn PDF document text
    • https://magerp.org/upload/files/24120680067.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/tefavaparadipeg.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/60028143029.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/50600366506.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/pogijarasogigesoji.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/5639653278.pdfIn PDF document text
    • https://yellowstonewildlife.com/vuliwalevazusinozago.pdfIn PDF document text
    • 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_off0000ae9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE9C 14000 bytes
SHA-256: 5528f363ea6e3d59a0d440ae2debb3fc7f18ac9ec3756cd18e1610c56f8d1e00
font_01_sfnt_off0000d19f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD19F 10636 bytes
SHA-256: 4c8ab870810c41054ad7106670176582a2161d6d79488292db6343ad8e1e33f9
font_02_sfnt_off0000ea25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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