Malicious PDF — malware analysis report

Static analysis result for SHA-256 758d1acd82e828d2…

MALICIOUS

PDF

91.2 KB Created: 2021-08-14 02:28:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1a4f78e21f620572cb20c5b4646d5b39 SHA-1: 5eea403056baf6b0a4cffbcdad563351752dea2b SHA-256: 758d1acd82e828d2c613b94468ffdb7656cd8a3055bdf59dc70c1ca99598c145
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to compromised websites, likely as part of a link farm to improve search engine rankings for malicious content. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document's purpose is to trick users into downloading a password-protected archive, a common tactic to bypass gateway security. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608591b40ba8b---xibosudevezusegol.pdf In PDF document text
    • https://rafautama.com/uploads/file/mipukemadeziwomim.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/voxomusawifesikaremaku.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/mugibogakojilufiso.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/10596853000.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/a915b0fa2a894f586f9d7f4411ec01bb/62045132660.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/ae7de1164d730edcbf1818d7f7990aa2/roxodupatofijukagerofasik.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/02b23b13ffd8a61a9a074d944959f4d1/xokafafupevokazexowepo.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/71170186534.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/0lj11irco9keiucjfu50b5mag5/juraw.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/73253603530.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/xowepamozufiwozitosinuj.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/1b1c259049e3aebde5ca5796104c6a3b/vebomevulifuvuxirupumixaj.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/wenutirozed.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/dotufolazis.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/1e3bbbda96acf99bd7a8316c1b19642c/25452832895.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop//contents/72723722218.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/vudugogexin.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/sabekasom.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1610f22f323ab2---kemifasoxakex.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076349b85b4f---watisakewima.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e42478f83---82876428990.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/v2u806u8qebj0rlkorrqmhh712/defipozizizavikab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=libro+de+tortora+pdf+13+edicion+gratisPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0B 18876 bytes
SHA-256: 9dd4063ef265785f59c6972623cf723f5c1218e599222b04c81a56e7714c381b
font_02_sfnt_off00012d72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D72 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
font_03_sfnt_off000142ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142EF 11068 bytes
SHA-256: b56d12c57d956dff581d63927d96ac502fc963358a0929331db297eaf5258f50

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