Malicious PDF — malware analysis report

Static analysis result for SHA-256 65fbb3ca6e4a82e4…

MALICIOUS

PDF

80.9 KB Created: 2021-09-03 20:03:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fe8a1426a8688ac83bfea9c96c8a9baf SHA-1: fbaefe9b26544410c3478a6cf78e5eadef783c5d SHA-256: 65fbb3ca6e4a82e40f16186f065a7d0f2c1fa7d93cad720dfbfec2c88f22cf8c
164 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to multiple compromised CMS upload storage locations and disposable hosting. The document body is heavily obfuscated and appears to be malformed, preventing a clear understanding of its specific lure, but the presence of numerous links to potentially malicious PDFs strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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.armstrongre.com/files/files/najuwatoki.pdf In PDF document text
    • http://kbchina.de/upload/sewasuzij.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/c3420560e381043e2c4bd5a157553a9a/domironokixumunu.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/d08cce5ba029d31870cb92f0c9f9be52/suwonaxelabid.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607cea382055e---79076377137.pdfIn PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/3876614365.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1611ab00d49c8f---35093557813.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/161030cba677ca---90272234804.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/wugereram.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/40503672205.pdfIn PDF document text
    • http://severstroysnab.ru/userfiles/file/sebitekexinewav.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/94028389947.pdfIn PDF document text
    • https://ehbo-oostkapelle.nl/userfiles/file/vavob.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/63998870423.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea95b50eea---96324402663.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/gokigi.pdfIn PDF document text
    • http://sakurahoaanhdao.com/webroot/img/files/90821334969.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/nugomikizeno.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/9otqqnm6tg4sp8md40bbmkajku/89092436996.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f64aa80f26---89607615008.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160f38350c71d7---10660581583.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/32189632339.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/65246138225.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=fred+e+jandt+an+introduction+to+intercultural+communication+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_off0000d6b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B1 17740 bytes
SHA-256: df257a81c36c7a0d69ee4185db5332168ec2293e998f6b029423d8095e89f537
font_01_sfnt_off000104d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE7 10820 bytes
SHA-256: bd41c12e15490093b12d5015ed3357c100c740ca1d4b4d6b25df40465781d2dd

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