Malicious PDF — malware analysis report

Static analysis result for SHA-256 d24caa8a890b8a93…

MALICIOUS

PDF

71.2 KB Created: 2021-09-04 20:55:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 580d7bb7439025c9e31619edcbc0e3dd SHA-1: fec26ac77d1d496773b95d79a469874d00d89b05 SHA-256: d24caa8a890b8a93ca0c653d3b26083f29da89202678d2e20d3fb909cc320296
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, suggesting it attempts to execute code within the PDF viewer. The numerous external links, many pointing to compromised CMS uploads and disposable hosting, indicate a link farm designed to redirect users to potentially malicious content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7199517cf---zugijerakosusemuw.pdf In PDF document text
    • http://clingac.com/d/files/zolim.pdfIn PDF document text
    • http://asid.rw/userfiles/file/nibikipebu.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0a4262a91---18776470475.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/57344096688.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8bf3e520cc---65624448369.pdfIn PDF document text
    • https://wsbtitan.com/images/file/noxifazifesiregagenuk.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/79056394941.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071dbb204e26---86544799954.pdfIn PDF document text
    • https://www.theoakshealthcare.com/my_content/js/ckfinder/userfiles/files/xutidokupepanadalizulifa.pdfIn PDF document text
    • http://superazs.ru/images/news/file/80790252623.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/jaresevi.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/gujikijuritusovajepegu.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/oee7qaohmqqbp0j1dt2dl2e0t8/fitokikesajik.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/2fb6630a2c81bc08d6644f6bed7eca25/foriro.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/29d88450b63cd50ae433175d094b4804/jagidipidumo.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/jeveronajudojesa.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f9497e2ce---16235980600.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/5241428150.pdfIn PDF document text
    • https://emtracing.net/userfiles/file/zebedotidof.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dac3861878---xiwalugitabefovanexup.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099ed9a0122a---1655366237.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/66493900151.pdfIn PDF document text
    • http://cpviettin.com/upload/files/dibeveduzuxisux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=surah+noor+malayalam+translation+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_off0000b520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB520 16048 bytes
SHA-256: 22d50c06b2f8a4e8816168c1de4e9b599b3eaf9975e6f9206075a3beb5851843
font_01_sfnt_off0000dd96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AD 10920 bytes
SHA-256: 6c80c5ba156dcf558c87966f54879015573ccf36b300c80dad65db5716778cb0

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