Malicious PDF — malware analysis report

Static analysis result for SHA-256 85973582ac88cbc3…

MALICIOUS

PDF

80.6 KB Created: 2021-09-20 13:07:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 352332ec36f77314d80344f140453d43 SHA-1: f36bc452c0db4dffd2e726f0467430e14470b3d4 SHA-256: 85973582ac88cbc332795ec1366128905bbce5d637538545b9dd54aed9ad7518
264 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF document flagged by multiple high-confidence heuristics, including ML classification and ClamAV detection, indicating malicious intent. It exhibits characteristics of a phishing lure, specifically requesting recovery secrets or private keys, and mentions password-protected archives, suggesting a multi-stage attack. The embedded JavaScript and external links, some pointing to compromised CMS uploads, further support the malicious nature and potential for payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://sobateracota.ro/mm/file/muviledesarovodododomelep.pdf In PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-9/file/70707665905.pdfIn PDF document text
    • http://pascalparrot.com/uploads/assets/file/9196314560.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/89936969585.pdfIn PDF document text
    • http://agavietnam.com/img/files/zivakifa.pdfIn PDF document text
    • https://doctornhospital.com/banglanews24/editorsfiles/files/jolira.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/37528236042.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/42491681912.pdfIn PDF document text
    • http://cmsrecuperocrediti.it/images/file/13681336720.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/68770108147.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/zukidugawetuxo.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/gubipobikibarawezotu.pdfIn PDF document text
    • https://pasarantogel.com/contents/files/nawewidoxozad.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/26058039854.pdfIn PDF document text
    • https://hinodecoder.com/userfiles/file/41128201025.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/rk27s0llqoufi6r21gu8ms88r2/mepikifukajubutebinid.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/vemunef.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143927faf812---81331635404.pdfIn PDF document text
    • https://digireg.gr/upload/mupodix.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/risobirojefejagisox.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/6171e8ed6f1861615886cdb7e08f6217/mozazopod.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16141de75052dc---xitate.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/ketudajifawugowisox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=openvpn+server+androidPDF link annotation
    • https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/woxoju.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_off0000d62d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD62D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3F 18284 bytes
SHA-256: b9d5443c2c88fe14b9a840919279da8f0543cfe25111a1d7f5af9623007db26d
font_02_sfnt_off00011dc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC7 10332 bytes
SHA-256: 25e85cb744a88e197485d002f422c9955a574cc5c8fcf0645be4db83fe77da9d

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