Malicious PDF — malware analysis report

Static analysis result for SHA-256 09cd4f48b0de1a2b…

MALICIOUS

PDF

82.8 KB Created: 2021-09-09 17:18:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3747e55bfbfc449665ef45eec08b0ba0 SHA-1: 06c349159ce3cb102ff83913a17562436c019b96 SHA-256: 09cd4f48b0de1a2b5ae5c223603baff80b0c6f57a694b986839e353215ef674a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically classified as a phishing trojan. The presence of numerous unknown URLs reinforces the likelihood of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137632b135cb---38605683256.pdf In PDF document text
    • http://lidaoxc.com/upload/files/fenosimavuvekose.pdfIn PDF document text
    • https://maintogelonline.info/contents/files/23621546009.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/54597811337.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/xapulefakerivix.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/gojinenemalugoloro.pdfIn PDF document text
    • http://abwessex.com/uploads/files/27500084574.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa8f3035e9---79279554196.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/47f432d6904f4c0edbd2d68b74d8af7d/14053787088.pdfIn PDF document text
    • http://camdohungdung.com/upload/files/62586000627.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/161337b21c1b87---lunixowataxusugo.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/aacd7bd676ea1bb5cdf35d3db1ccea83/73869337172.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/1rn3tv1hcq4tmdfc73bm0mib5g/97663504238.pdfIn PDF document text
    • https://1tlstar.com/storage/uploads/files/dilozofasulosevorexagemak.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-8/20210908191449991996.pdfIn PDF document text
    • http://sungwoo-n.com/userfiles/file/xomasopumejefit.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/91470732188.pdfIn PDF document text
    • http://thebrownbag.vn/upload/files/63588048279.pdfIn PDF document text
    • http://heichapuzi.com/uploadfile/file/91936191360.pdfIn PDF document text
    • http://inphuduong.vn/upload/files/84664977385.pdfIn PDF document text
    • http://nadafashionbelt.com/Uploads/file/5063241211.pdfIn PDF document text
    • http://cathugo.de/res/wysiwyg/file/sawoleratipodavinonisu.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d71339b27---37093303298.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=crossfire+mobile+apk+downloadPDF 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_off0000df0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF720 17804 bytes
SHA-256: 0a854b54489b86cdab7b100f26bb20339df603f2246ea8e7982cb91e32e6e34a
font_02_sfnt_off000124de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124DE 10912 bytes
SHA-256: 87ab7ab1965e48e3940dfdb49a9a0156db5f587c612fd59e1a8b65a115a7e562

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