Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4df6dd46233bd9e…

MALICIOUS

PDF

80.8 KB Created: 2021-09-24 10:27:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c4c8b10af610ed5fb559bd439a19ded3 SHA-1: b97d9d62764e00b00ea91ac3a4a08646bed2e0d7 SHA-256: a4df6dd46233bd9e902c6c646534db68988dc053dc3bbd16c5c769322e7c562c
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a phishing or malware distribution scheme. The document body is unreadable, but the heuristics strongly suggest a link farm designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://inwebjor.ru/uplcv?utm_term=how+to+clean+internal+storage PDF link annotation
    • http://aromacosmetics.bg/assets/userfiles/file/8379877228.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/202197111511794.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139806f9178c---relokajunidakodutexudo.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/roxelotarobiri.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/11176937544.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/39818750702.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16134c4c1b31fa---ruzukoguzimodi.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/cr6po2crmkqs9cnnsbqgpflt31/xujeniwagefogumipuzij.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/lezax.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/28983018226.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/dubetajaxukedorimufetobob.pdfIn PDF document text
    • http://festacreativita.org/userfiles/file/52007813901.pdfIn PDF document text
    • https://suthuytinh.com/app/webroot/uploads/files/wojomuwu.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16134b6d507593---23014166050.pdfIn PDF document text
    • https://pamukoglu.com/userfiles/file/tazuxesa.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/631d63292b703474934bbe1723e4d2b1/jemakakeji.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/rudaretagokozisiwatedikix.pdfIn PDF document text
    • https://ev-owners.jp/userfiles/files/vixinobu.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/2889024263.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/menalened.pdfIn PDF document text
    • http://zehanbiopharma.com/upload/files/vadafogudeselonotis.pdfIn PDF document text
    • https://reklama71.ru/upload_picture/boduron.pdfIn PDF document text
    • https://b2cdemo.tickets.com/content/files/peramimuduwirelez.pdfIn PDF document text
    • 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_off0000d7cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CB 17936 bytes
SHA-256: 36c2d72e6a3ab9ceba4a19d36daf83b8fbb9c843a9da2382a878cb1076d586c8
font_01_sfnt_off0001058d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058D 10480 bytes
SHA-256: a9c6a22bb869d0f78d3e9db9963f70fb2dceae10bbd247af708df1b94bc03baf
font_02_sfnt_off00011d89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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