Malicious PDF — malware analysis report

Static analysis result for SHA-256 b027bd58262db63a…

MALICIOUS

PDF

87.2 KB Created: 2021-07-13 16:45:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 16de2619fde1f44fcb92ef8d3d936375 SHA-1: 35c0101d93e921a75f3cde9333507c0f8e7cdf02 SHA-256: b027bd58262db63a9d1f255be96395beafad9ea98d2d04bebb9fd7794a8a4aae
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, with numerous embedded URLs pointing to other PDF files hosted on various websites, some of which appear to be compromised CMS uploads. The primary goal is likely to lure users into clicking these links, potentially leading to further malicious content or exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://vickerycarpet.com/uploads/images//files/liberobadizatusos.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609495e235ab7---gikevobonebuzunixozuwa.pdf
    • https://thechoose.it/file/80783273417.pdf
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/1f8fceh67m0tbvnn2jtk3msgg4/72828097727.pdf
    • http://mkconline.com/landmark/ckfinder/userfiles/files/21715620424.pdf
    • http://kaupa.cz/userfiles/file/vamenelakuxosokijupek.pdf
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/be588b2637c8e3e2e71945da98350c32/37309944445.pdf
    • https://aartipalette.com/userfiles/file/meduxadopovusa.pdf
    • https://mps-india.com/userfiles/files/dasoze.pdf
    • http://universe-micro.com/upload/files/20210628_043331.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c293816866f---lufaxejopedufexemiwivizis.pdf
    • https://avvocatoboretti.it/file/66743863276.pdf
    • http://tfh-filter.hu/_user/file/pefomugeditiwe.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c25eb189195---4831981620.pdf
    • http://marsalanoleggio.it/userfiles/files/26613860560.pdf
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/sutul.pdf
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/ba46adc62012615c275a43966d6e8e52/migizuwiza.pdf
    • http://flightshop.jp/images/blog//file/42640078819.pdf
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/u0o992idt42sem5csl7es3hj9h/67213878853.pdf
    • http://iqlacpro.vn/emotive/upload/files/31929104988.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/44aoalbbrdb4n31r8otlgrp2n0/ridijonowaxogawivimamelod.pdf
    • http://ahcxdq.com/uploads/file/041624454606.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/i6vr2l2c5i812s16nku2uu4g38/13200929507.pdf
    • https://samyenngochoang.com/wp-content/plugins/super-forms/uploads/php/files/ffu2rdrcr50gelua0iv2pf491v/44306939624.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=odds+on+players+next+club
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef00.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF00 16792 bytes
font_01_sfnt_off00010712.bin
9544251f7d240bf7e14015828a68575d58061d9187f5830636f6e2a2153c37c2
pdf-font-stream PDF embedded font (sfnt) at offset 0x10712 17260 bytes
font_02_sfnt_off000134ac.bin
a8f9da854b48570439b3c6dc5800dda0bb6b97fd5e549d413d8c6b937ab20f83
pdf-font-stream PDF embedded font (sfnt) at offset 0x134AC 10896 bytes