Malicious PDF — malware analysis report

Static analysis result for SHA-256 eac18e79f6a9813a…

MALICIOUS

PDF

68.5 KB Created: 2021-09-18 02:01:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2c4b5e525ec259a121d58b0e623928ac SHA-1: b5aa2fced0ead92b2f2db00ee5e6725f1f5eb9c5 SHA-256: eac18e79f6a9813a5ed67cb92e88213415403dec28e223ddb2fb46c40d951677
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple unknown PDF files, with several hosted on compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users into downloading further malicious content or phishing for information. No scripts were extracted, but the structure and URL targets suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1614342f27f24c---lodixif.pdf In PDF document text
    • http://auto-spec.ca/fck/file/60991476417.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/76804657007.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/budadujonataxatovoxifolez.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/90991593256.pdfIn PDF document text
    • http://bananamusic.tw/uploads/files/202109032257515627.pdfIn PDF document text
    • http://zxsolar.com/d/files/lujugemosasonidatujakogu.pdfIn PDF document text
    • http://szybkieprawko.pl/szybkieprawko.pl/user/admin/fck/file/vosapurikuk.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/463535717.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/76b6b3f25d6ac82ae43ff1d2bc4f0b7e/53344869025.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/i13qvnnlqda0q4l7op0dh39lm8/59621787934.pdfIn PDF document text
    • http://elektromig.pl/userfiles/file/48735047488.pdfIn PDF document text
    • https://pre-www.bridge-academy.com/uploaded/ckeditor/files/sifonumekolivuroja.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/3gbs0n91jbnmqtjr8kapbv77on/82851011730.pdfIn PDF document text
    • http://bourgogne.annuaire-regional.com/ckfinder/userfiles/files/kojokifavisuvetanap.pdfIn PDF document text
    • http://scarpatti.com/files/gulomubaribusar.pdfIn PDF document text
    • https://strechybenesov.cz/content/51543625755.pdfIn PDF document text
    • https://altaitur.com/ckfinder/userfiles/files/penokajepaparobu.pdfIn PDF document text
    • https://biodez.lt/i/File/74424038604.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/sajovikugotezulawafid.pdfIn PDF document text
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/88553250658.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=find+my+downloads+on+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_off0000b121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB121 10356 bytes
SHA-256: 6f7c062d3b47bb6e95c741b15ba801f5bc8a2910315bc9b7792c0caa85dce621
font_01_sfnt_off0000c86e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC86E 14376 bytes
SHA-256: d71c7e3acca9fda0bf7d0076a2cf68efd72406f6460fb6f5f5aad9f8f91de820
font_02_sfnt_off0000ec2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1