Malicious PDF — malware analysis report

Static analysis result for SHA-256 476349fd1d5af5fb…

MALICIOUS

PDF

71.9 KB Created: 2021-09-01 11:19:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c5f41efdfbbcfd1eb41307d4041283ad SHA-1: 31fc5f4d02e761300bb9690b36e192a9a7fecb8a SHA-256: 476349fd1d5af5fb6d63072c7a8ab56ab92de8001da0c8e40232a9c496e297d3
156 Risk Score

Malware Insights

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

The PDF file contains a large number of links, many pointing to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded links are the primary indicators of compromise.

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 http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f24383cbc96---23123340487.pdf In PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/nbk4vg0nf72ol5ehm840u25tg2/70826577507.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612bfa5e08537---54516326857.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210628232513_cvl9f4.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/kidawesawaz.pdfIn PDF document text
    • http://jdjcnc.com/upfolder/e/files/20210805124242.pdfIn PDF document text
    • http://cukrarnakolbaba.eu/obrazky/files/72992704866.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/lujajuw.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c94da056a01---suvizesowurerewusow.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/nusobisuzezax.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/vexunovumefe.pdfIn PDF document text
    • http://scpt.it/userfiles/files/fifenewe.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c3132f6a5---xuvojanifelamabat.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/a075f392c351d6ef085e5b7d99fe8b27/20096097250.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/4211cef62affa8dd84a59999c571a192/2098244290.pdfIn PDF document text
    • http://deshdunya.com/blogimage/file/50654518303.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105e30b1ece1---47303228842.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/53732071174.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c7de93daf---zunibo.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/39255567481.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/901e2fc05cff0222455b3b28b7ad5eae/jewozina.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/demoridapewa.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/47109900386.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=bedtime+7+month+oldPDF 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_off0000bab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAB1 10184 bytes
SHA-256: 5324148bffc7d9275bbb5b4284bfd13465186e3014a34b1ecd92706502e996fa
font_01_sfnt_off0000d143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD143 15976 bytes
SHA-256: f9629021b4ab60b59a98905c88751174f01a6d9cfd51545aed6c87a7c58c2f91
font_02_sfnt_off0000fa1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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