Malicious PDF — malware analysis report

Static analysis result for SHA-256 d86b86355a5d640c…

MALICIOUS

PDF

75.2 KB Created: 2021-09-05 23:54:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 04c5be8072a08d9a526e22a03b718668 SHA-1: deb35a7bb403b5d8dee72f1ad353b1b212d045ef SHA-256: d86b86355a5d640c38d4028d3b4cad51b5bc3a0ec1af07122d3cc054dba74db5
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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
  • 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 https://philabc.ru/uplcv?utm_term=convertidor+de+pdf+a+word+apk+gratis PDF link annotation
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/dfc2a0a5dba873582e7de4f3f15d8dd0/tomumozaxaxupazinopakigug.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a5db7a874---vupedaxut.pdfIn PDF document text
    • https://impactmediaresources.com/userfiles/file/86003864692.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/f9t2hcdjulkotegl8vh04agvu7/bilupuzevozamosimugosax.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/tenidumezowif.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/92018330607.pdfIn PDF document text
    • http://thallo-food.hu/uploads/ckfinder/userfiles/files/mebaluvasebuwunipelak.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/52097283492.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/kubenoboluwolusawevazugu.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc7ccd38fa---69694956167.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/e7a7u30b67jjef0kc8iddqouot/1539138152.pdfIn PDF document text
    • http://baominhlabors.com/upload/files/keduduzavasutebixulamum.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/q9mh1sikhel7qc76oukpeeuo56/xafizet.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/4055857be3593bfec4ec32ba72f48f4c/gumukaraxidani.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/1998924137d524318ddbc0d34fc41f5e/78549704288.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/27d09f6613a5282f2880ae35a5560692/41493761810.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/53239296202.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/77603675362.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/vlb85q1n335djoqu6ekekj1qp0/2195697597.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///zikonugikujivupujusapofip.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/jovijixuzaxe.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/sboet6dl44n9t89j3li1defm70/fadufo.pdfIn PDF document text
    • http://primaneighbors.com/userimages/44036641026.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_off0000bfea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFEA 10904 bytes
SHA-256: cd492bdfabbc038f0dc3c1f1e1c3d65c841d04a0b371cc79cf383dfb1f44ff41
font_01_sfnt_off0000d933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD933 17044 bytes
SHA-256: 70bec29f157b78a24270a5e8d266cc66ac3cdaadde8050368c32a355edfe3c1d
font_02_sfnt_off000104fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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