Malicious PDF — malware analysis report

Static analysis result for SHA-256 f57ff9e10b01d9d0…

MALICIOUS

PDF

84.4 KB Created: 2021-09-03 20:12:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 258535a7c9488b1f08e13064c3852784 SHA-1: b4bdb2dfe8be863582f136e8cb4978ee9a9cfa24 SHA-256: f57ff9e10b01d9d0a2886a5aa69c3e9bd60861901cd5ef1c53f27b59519e4df3
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised WordPress sites hosting further PDF files, suggesting a phishing or malware distribution campaign. The presence of numerous external URIs and link farm heuristics points towards an attempt to lure users to malicious content.

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://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/c70c21aa2827ce74df9ff4c4e85b7270/60377620695.pdf In PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/thnfq5a7lv0p5k46j5gsmfml59/45657382440.pdfIn PDF document text
    • http://bscartridge.com/pic/82357547936.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/pitobisapibujofavu.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/99642776842.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/90ac534333efae79fcd72cf23bf04128/kubenowimejaxodibul.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c3573125384---96866974997.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7a5881e000---19084722487.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/80942354a00fa5de63055066d5aca652/24902114771.pdfIn PDF document text
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/47968624340.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/89033635163.pdfIn PDF document text
    • https://ubitanduk.com/contents//files/pekitilogetesij.pdfIn PDF document text
    • http://unsersohn.ch/images/file/zunizojoxujupulibajaz.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/7d05903f3e7f42eafde5964d72fabf48/bulejomurosu.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/jiu81jr3rg1a8jo5tfojm8q1mh/92186158793.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160810859889ef---nipizaselus.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/wuzekoxelajagamisubok.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/8a35586d198b8ab6a917c33bdba880ea/vokusidapurigip.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160cd0cb5e5b4c---48667247374.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3032383c5---18528569828.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16082dcef37803---kuwamuxa.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/79759180595.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/57498160899.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/kobozivipukomefizide.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=plato+five+dialogues+crito+pdfPDF 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_off0000e5fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FE 17376 bytes
SHA-256: c1b2e633475ddaff77e8498d71aebc7435ea3be6addcf0ed3a85478833f2f178
font_01_sfnt_off000112ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B05 10860 bytes
SHA-256: 77fe4b158c43d5c2c0598ddb0758e5170e4cd76d19aee92c48516b9318b52a7f

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