Malicious PDF — malware analysis report

Static analysis result for SHA-256 f672b671fcec5519…

MALICIOUS

PDF

67.2 KB Created: 2021-09-29 14:49:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: ff882608f31f702e68ad8b22ca673a79 SHA-1: 0e58fe455d8a42f18408626eabbb17b6d80db615 SHA-256: f672b671fcec551992afc1e017a9ed782be738eaef99dd4c2aca16b4b7713a0f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a phishing lure. It contains numerous links to external PDFs hosted on compromised or disposable domains, suggesting it is designed to redirect users to malicious content or download further stages of an attack. The presence of multiple external links and the 'image-only' heuristic strongly indicate a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 7

  • 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.
  • 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://wojczak.pl/userfiles/file/wiletupanizukunilixe.pdf In PDF document text
    • http://www.childofafrica.org/media/userfiles/file/16211064839.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/wufokobomibimofabak.pdfIn PDF document text
    • http://arhive.np-sp.ru/img/file/55420573003.pdfIn PDF document text
    • https://fajndoktor.cz/images/file/files/91950287398.pdfIn PDF document text
    • http://catwalkexotique.com/userfiles/30308952986.pdfIn PDF document text
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/lixatamonuberefuzupeviwe.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/xerilugaj.pdfIn PDF document text
    • http://plnjl.com/userfiles/files/jopuraxiner.pdfIn PDF document text
    • https://luxm.pl/userfiles/file/wuzenijojasakerasop.pdfIn PDF document text
    • http://szm.hu/userfiles/file/27181234776.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/01400ab6bde2f044fa22ed5875ac6cca/49017145164.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/6903916259.pdfIn PDF document text
    • https://inprovitparaguay.com/ckfinder/userfiles/files/79928543919.pdfIn PDF document text
    • https://xehowo24h.com/images/ckeditor/files/34996867077.pdfIn PDF document text
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/gibexep.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/zifidaxomamoduj.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/relenikevujubilewamuja.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613637b6c4b1f---kosigoborawatexem.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/xudas.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/dijimofinaxow.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1615445dc35e0a---punixanuzikamel.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/xeduvoruzip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=convert+photoshop+pdf+to+pdfPDF 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_off0000ad8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c5a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5A0 13936 bytes
SHA-256: 628aad6d0b38e72cc38a9d91c8d85b0af4d6219340da5e026a2cddc1f4ea03d8
font_02_sfnt_off0000e80f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80F 10392 bytes
SHA-256: 1fff83963ac7bc86017542139e07fe8405ec73c142c5a97991b0868f291baefa

Open this report in the interactive analyzer, or submit your own file for analysis.