Malicious PDF — malware analysis report

Static analysis result for SHA-256 32be82f03dd41ca3…

MALICIOUS

PDF

79.2 KB Created: 2021-09-01 11:46:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 309b9b59d7093765d1cf6adf5a8fc19f SHA-1: d3c1016f7ce854985ea99b5922220e4d673d0cef SHA-256: 32be82f03dd41ca34849a8ed9f80c96f8924ec19617d1569fbb0228101e0e0c6
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. The document body is unreadable, but the URL structure and heuristic firings strongly suggest a phishing or redirection attempt to deliver a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • 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://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/k47bgbmlmglsbdcslgv52a333j/tejuwitanewa.pdf In PDF document text
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/f14e23734fff8aded2d19801c1a319ed/daloxibedovijege.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077f070cfee0---45162740533.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/db85seeo5s1g16j3ab1121dp0l/32995579627.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086474898c47---zusupo.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/mejudetikif.pdfIn PDF document text
    • http://svenskafik.se/uploads/fckeditor/file/24815045870.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/tulaximijoto.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/2423228778.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aabd0ec86df---dakafexiwaxakoz.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/6441126506.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e197ccd5e0a---penevobomisipab.pdfIn PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/jubeduro.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/eubd6q50pt0hqdlsjl3qtn8ip5/57001207892.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/d31igitddfbumbkek9vd6t2qu0/mejawasozevujun.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/82c64aceca6e77619dced1d9a112d260/8106219300.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/4d113a9376b15aa1636ca9336ba00016/zemokapuvopafejokedim.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c8315407c---jividojekaxatumivoxuf.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/18523881075.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/viganurefose.pdfIn PDF document text
    • https://vigiweb.cl/dinamicos/files/file/kaziburoxorolugipolep.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/90a8c821ba03df95884549cead8727c3/jadifijuw.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/ke4tklb7j6rlfka3mvld17gl77/13044203267.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=names+for+twin+brothersPDF 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_off0000d3b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B9 16752 bytes
SHA-256: ffc799f7e728a7e73d7abaf9030faaf9998d24b3672ea972182bbf9321572102
font_01_sfnt_off0000ff01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11718 10636 bytes
SHA-256: 2d4634e8bfe07dd88ad23bda1cf510fbb4c5f47b09dc99468fea228ee610ff2e

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