Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b24ab40d151e69f…

MALICIOUS

PDF

79.6 KB Created: 2021-09-05 20:52:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2c51039d62ebf7b1fc9f9c57da39a44b SHA-1: 5c11db0e377be710e8b2ed5cb47d8c177764a3b9 SHA-256: 2b24ab40d151e69f3a651f21cdba5898a8f227666b35455e4a72be3db29a7546
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links to websites, many of which appear to be compromised WordPress installations hosting PDF files, suggesting a link farm or redirection scheme. The primary purpose appears to be directing users to potentially malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce81deb235---7426489871.pdf In PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ca90c983d---19260970234.pdfIn PDF document text
    • https://ladulceseguros.ar/noticias/fckeditor/file/fizimerirafok.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/9b1ec0ff661a414062bd363bafbff618/6976928723.pdfIn PDF document text
    • https://kiaavcilar.com/upload/ckfinder/files/vakubo.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/busawo.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/82494644647.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/zekumozuduxakoropuwowika.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/4fad03ca0ad47eb758b6a05a027446ed/kozupikowofebuzeximul.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a050e47ad97e7dd610b5dc23c0a6d00b/91556123740.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/43571939648.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/d0264cb157cc971c4775a88364ecbd0e/56587394436.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/1378207723.pdfIn PDF document text
    • https://unosms.us/userfiles/file/78632056967.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/ritipixiviboxedovub.pdfIn PDF document text
    • http://avanti.pl/userfiles/file/24863614500.pdfIn PDF document text
    • https://coaching-jk-academic.com/ckfinder/userfiles/files/40794248557.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609091c4d2fc0---nebipaveboxojibet.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160754ef64e047---3724478506.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/pipozejogevalojexukumajow.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16097cd644217b---vutubuzaguso.pdfIn PDF document text
    • http://synphabase.ch/upload/file/pexibopot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=pdf+white+out+freePDF 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_off0000d60e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD60E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE25 10156 bytes
SHA-256: d3c05ec13a0e2be9c9a88d87bdfb1cdb5bda4b69a54e4735eedde62f16d3c49c
font_02_sfnt_off00010509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10509 17076 bytes
SHA-256: 8ddabb66cdd312213266c921df7a4117462f33d695ce0e8ad8ef7802f4adc48b

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