Malicious PDF — malware analysis report

Static analysis result for SHA-256 dca58630f10db37c…

MALICIOUS

PDF

122.0 KB Created: 2021-06-26 07:48:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 4538adea5f335a89c94bc01e77f8d438 SHA-1: e226a61db2453f653cdba3ce80319c8ab3650ed6 SHA-256: dca58630f10db37c23002cb0f39ee9d84e7e24008b15ac1de8cebe955500c53b
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, presenting numerous links to websites hosted on compromised or disposable domains, which is a common tactic for phishing or distributing further malware. The presence of multiple links to WordPress upload storage and disposable hosting reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/b3e66444ff75440393a233c25323bac9/pavaf.pdf In PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082858117b78---78405090120.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/fuzazijafulifuge.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160ccc0184bb1a---56765746576.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/25106385288.pdfIn PDF document text
    • https://ptogel2.com/contents//files/dimasiwelazejemadis.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/deduf.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b83102f14---sosilom.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210613_184229.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c872183c264---wavireradobototijid.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ac408dab60d---80010791263.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088966c924aa---vutirilafom.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16090c87f0effb---metas.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/b7ea05f5cd9e7c13afc889aa0f608fd5/16320680338.pdfIn PDF document text
    • http://sdds.be/userfiles/file/momitokikijodonenonato.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720506ca858---67841386461.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/f84a034c12967618c7cf37f08099ce37/nusalavus.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/2991070685.pdfIn PDF document text
    • http://timebymtm.com/upload/files/225994975.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/7475223303.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c60899d42---11854483312.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160acd4fb1ce91---gibimi.pdfIn PDF document text
    • http://whatdwellswithin.com/file/82691134043.pdfIn PDF document text
    • http://essuances.com/ckfinder/userfiles/files/gibijevadorozejo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=does+air+have+a+short+vowel+soundPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015bf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001740c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1740C 10596 bytes
SHA-256: c3eafb11c781021dbebfcab8e4c9cd0902be4dfa9017a42032b749fd5804b05a
font_02_sfnt_off00018c37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C37 2136 bytes
SHA-256: 2b8006cb7154baa14f3d6d5f0ff398ac3f2527f3d1804152a7ade81a5ebfdc80
font_03_sfnt_off000195d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x195D2 26172 bytes
SHA-256: cb397012c860765d31d6cbd24048f35d7c55f0c5f2d26f712d4e80e9815d2509

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