Malicious PDF — malware analysis report

Static analysis result for SHA-256 74656cf5795dd26f…

MALICIOUS

PDF

74.0 KB Created: 2021-06-30 04:12:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d64b768e1db89cac91b3a87bed2a331a SHA-1: 9609bce13be14a60aa915ca2637277f0e014cd10 SHA-256: 74656cf5795dd26f0d0da973d8d0a603ceb7ddba6e30aaffc8d16e070067b557
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to compromised CMS upload storage and disposable hosting, suggesting it is used to distribute phishing content or further malware. The presence of external URIs and the nature of the hosting point towards a spearphishing attachment delivery vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://irlanc.ru/uplcv?utm_term=class+10+tamil+guide+cbse+pdf PDF link annotation
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608220f144c2e---11561879571.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b5cc0844b77---vagunasebejifisedejog.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/0cc84f82361e05ea2bada00e7c9ff042/83050618880.pdfIn PDF document text
    • http://groupkaishan.com/d/files/86896378756.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/rulawokopozemagisojixa.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/42a14e9aaafb3c066ea9f86cc70a05d6/zinobilokutasodavozovegev.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/wagunufabedofifepas.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/447e0921f362085abb0e5dca9601956e/nanobelapoxodirevepetalo.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/medupevi.pdfIn PDF document text
    • https://lecormier-menuiserie.com/www/upload/files/94605989266.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/23672123692.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/c85238c5a75e35fb62ba76db7cab9f11/vogidumefotu.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16088571cd6015---61743712880.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/94244495835.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/31380287286.pdfIn PDF document text
    • https://advik.net/userfiles/file/linejatopitapu.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b97c0a4df95---10280838484.pdfIn PDF document text
    • http://domainecomps.com/documents/files/47102748964.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/5964bfe5940e175c99d3b3680d7e6444/zuzuwilakavifotaruzenoxa.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/8426afdd663a0e3a5a596921196d0564/vaxiwuwogakifudakilevar.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/113df2a02e37c12a3345e9a99c294cca/78060504540.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16078c5736b6a3---81750772592.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608414c17af24---dumuwusoxivufafisub.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/9348009208b90bfa4c1245191109e1ff/74524796810.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_off0000be81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE81 11084 bytes
SHA-256: 8dac33ee40f656b3b45e6bbaa71e6c7e1a712a93543e8d4a177f818541efc997
font_01_sfnt_off0000d803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD803 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF015 15956 bytes
SHA-256: 8c58299839f26bafc7ba654ae3e58766ac0b4772ad161958de7e5de125a66c70

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