Malicious PDF — malware analysis report

Static analysis result for SHA-256 8257f6b15b3a7c8c…

MALICIOUS

PDF

88.2 KB Created: 2021-07-23 18:09:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 917cdaa48f2705cdc0dda36a0fb24204 SHA-1: f69e3d20b711eabe9696d47f986c77ff574d4dd3 SHA-256: 8257f6b15b3a7c8c84d24d92581a46d8fdff32fcddb45cad2cff24afddd42209
204 Risk Score

Malware Insights

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

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external PDFs hosted on compromised websites, suggesting a link farm designed to distribute malware. The presence of a 'download button' lure and instructions for a password-protected archive further indicate a malicious workflow aimed at tricking users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ce860f341bc---40764412224.pdf In PDF document text
    • https://oncetrabzon.com/resimler/files/nejenoxemururujema.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d37e58eb2---63854343560.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d341e57656---8949107774.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/0d16b3d499cb65c23e7c65ab9f32c691/90433838764.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/89401966726.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/45061938952.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/c168f826baad1aa12bd5b5025acd8cad/39853292867.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/69738467712.pdfIn PDF document text
    • https://vigiweb.cl/dinamicos/files/file/somogokegox.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/medurerisixetozabupon.pdfIn PDF document text
    • http://elijahlaurabishopblack.com/clients/b/be/bed082b287f5bb70db4763ab929fc18a/File/ravixonopifawuvewewusu.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/fe8e07a06768f4dbe0ff57b552639f27/puzogukinatobogewe.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a41d59483a3---90636993771.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/vujezosolivowadajupimabi.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/52385372807.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/92710014908.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c47750b7d7b---31922566843.pdfIn PDF document text
    • http://usmleworkout.com/files/file/zalikug.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/bobepobenevubilazas.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609dba2ee7b80---22882133931.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/11917104728.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=wow+wurth+5.00+19+pl+download+keygenPDF 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_off0000ea9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AE 20184 bytes
SHA-256: bbe926a020976053b92db2dc044c4f9a898543fd41432c3d005d82a50157eb43
font_02_sfnt_off000135b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135B3 11336 bytes
SHA-256: ce793236795dc2d2736d3c3f9e1fa4d710e742da18751e1114b00c46b5cff21d

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