Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed5057ac7ab316a7…

MALICIOUS

PDF

82.4 KB Created: 2021-09-09 02:03:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 83b3f9d22da69996d9191e1d92347aca SHA-1: 706168184b741624fa4c9abf17f51cafec741fcc SHA-256: ed5057ac7ab316a719e8e063f3ab998d7069271f65ad71f78f30bd7a29aae4e2
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload. The document body is heavily obfuscated and unreadable, but the presence of multiple external links and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic confirm the intent to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://thediamangroup.com/_images/files/fepigejewomadag.pdf In PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/94944767249.pdfIn PDF document text
    • https://nhahangbienhaitien.com/uploads/files/66246133157.pdfIn PDF document text
    • https://faceless.me/userfiles/files/44961470634.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/linevofij.pdfIn PDF document text
    • https://aspirecambodia-edu.org/userfiles/file/9724048395.pdfIn PDF document text
    • https://escaletravel.com/userfiles/files/56186354704.pdfIn PDF document text
    • http://nincity.de/inline/file/gijarukorepekezef.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/lfj1u2gtea9alf156g8lmq6cae/rugijonezufujefuxudu.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613022d627f5b---75273777074.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/padofebosopanofafezalel.pdfIn PDF document text
    • http://studiodispirito.it/userfiles/file/89766795123.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/file/1630909081_1.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/57689307513.pdfIn PDF document text
    • https://il-gusto.com/images/file/wunorisuforelifog.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/mr1ivrrsr517cd4g82ra0sob3s/99884253454.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16135da34e4f29---57840358059.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/44039873914.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/b9f551bf546947c32754a51b2e66bd32/faxinajajoreburenepef.pdfIn PDF document text
    • https://lenaoyunlar.net/calisma2/files/uploads/zilozubedagi.pdfIn PDF document text
    • http://daonshop.com/files/fckeditor/file/71707125194.pdfIn PDF document text
    • http://administratieindex.nl/images/uploads/43195661952.pdfIn PDF document text
    • http://evolution-dev.com/file_media/file_image/file/wufusu.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/jedodaxaxomumoradumu.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/tasaxaxixalufofadidi.pdfIn PDF document text
    • https://bomando.bomsolar.com/uploadfiles/files/72934333194.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=best+app+to+convert+pdf+to+pagesPDF 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_off0000ddde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDE 10776 bytes
SHA-256: 4003666449e1abc3864e7b5ba09c40bf8e6dc51d9cb997ed1aee7e1028d4d306
font_01_sfnt_off0000f6b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC6 17340 bytes
SHA-256: 775c2132209677fd2c4e4f437903ca3ad23923fa2b9d756284afb3091d67c640

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