Malicious PDF — malware analysis report

Static analysis result for SHA-256 71ec39021694bba5…

MALICIOUS

PDF

79.9 KB Created: 2021-09-08 11:45:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c800a0f52f15c23b811fe9d591f76304 SHA-1: 45543c5c0f0cad3b385c7529887547df5e5c4db3 SHA-256: 71ec39021694bba59a3cb3b5dc18a7f809ab688581a030edde634599b9b6670f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and the nature of the links indicate a phishing or malware distribution attempt, likely leveraging a PDF exploit or social engineering to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://cructi.ru/uplcv?utm_term=citroen+xsara+picasso+desire+manual PDF link annotation
    • http://daiduongmetal.com/uploads/ckfinder/files/3468691413.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/61e44888871978d68512a4ebf4b55a53/16329085615.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b979be2755---28970107056.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/nutivefizirip.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/gedot.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/c7a71b047d521022a5c567f99f48bd78/62572047625.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2e2f41923---janexevojo.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/34711491089.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/91d4ee7c253e88a4f61800e41dac4c0e/dujinaso.pdfIn PDF document text
    • http://prmakeup.com/Image/files/kibaguzerevomivebivugevej.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/vsqaonigtf3r5chsajj0r063d4/fodiramidakosex.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/20adcd477200454515dbcdff4b690590/28247353447.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/fevikexig.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/fipujan.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609f664563dfc---sokabilux.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16104949a17d0a---21634884776.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/86989340160.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/26541775409.pdfIn PDF document text
    • http://eternalcycle.com/FCKFiles/file/fegido.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/majexi.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/85193530376.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/36018495306.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/76648affcd335d6b72626958e0f356c2/7238589350.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/1121296737c966c9c9ee41cb6161067b/53667523705.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16086d5d6ecf02---xojeku.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_off0000d4e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF2 16828 bytes
SHA-256: 431f3adcd59108c6cd2a593ef373683480334e64c5d9b77b41909ce0e472a1b8
font_02_sfnt_off000118a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A6 10908 bytes
SHA-256: 918d25e3b756a2263fdc20d837181ca45edb8d431bdb46ab0e5922ebc56bab7d

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