Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed24a1299e7ddd54…

MALICIOUS

PDF

82.1 KB Created: 2021-09-12 13:56:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 86d136a660e6d0cdda0c27ddeb43ee01 SHA-1: 376d768bed71a636bb8e27a5813b251fc020b4c3 SHA-256: ed24a1299e7ddd54304599c8669f4fd2400344f31caa0aa78e318024e968dead
284 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and ML classifiers, exhibiting characteristics of a payment redirection lure and a password-protected archive lure. It contains embedded JavaScript and numerous links to external PDFs hosted on compromised or disposable domains, suggesting it's part of a phishing campaign. The primary attack pattern involves tricking the user into downloading a secondary malicious file, likely disguised as an important document or archive.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 10

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://losaltos.com/wysiwygfiles/file/luvoguwibokam.pdf In PDF document text
    • https://studioconcept-stand.com/fck_userfiles/file/ligemoxidiramogan.pdfIn PDF document text
    • https://hargagila.com/uploads/image/files/3292271330.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/6b971d1fe208f3d0789ade62f19a928b/begepugigi.pdfIn PDF document text
    • http://aluminial.pnh.pt/js/ckfinder/userfiles/files/nituku.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/zitusumutiwalovip.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/90239229347.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/dc36c70612c88553c137155c057edf89/zakokavovitipazuxe.pdfIn PDF document text
    • https://anne-berger.de/sites/anne-berger.de/files/fkcfile/22975218499.pdfIn PDF document text
    • https://equipelec.fr/ckfinder/userfiles/files/velox.pdfIn PDF document text
    • http://chinastom.ru/userfiles/file/31895884134.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/41890587532.pdfIn PDF document text
    • http://clinicaveterinariacittadivignola.com/userfiles/files/39778330606.pdfIn PDF document text
    • https://satybharat.com/ci/userfiles/files/woposubemigij.pdfIn PDF document text
    • http://www.ap-arte.ro/fckupload/file/69984368352.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613484f2843d8---9882190851.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/161302ea8ee9c9---86407414324.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613251a57ee67---masubadekamakunubozat.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/bedeseber.pdfIn PDF document text
    • http://christopherdallo.com/file/88242736172.pdfIn PDF document text
    • http://placidlakes.com/larpm/uploads/file/86667878931.pdfIn PDF document text
    • http://mmbassisiprovince.in/files/js/ckfinder/userfiles/files/49169674283.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+enable+short+code+sms+androidPDF 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_off0000d829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD829 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF040 10852 bytes
SHA-256: 5ffeb991ddf9c416fc1c1d9567bb8f58fc05bd3c79e40e44efd0c2dc656a6f0f
font_02_sfnt_off00010924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10924 18812 bytes
SHA-256: 8be49b8962cb9b1ecb954d3fe4180b68b2187fd8bd65ffda17802e3e1b183d64

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