Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f3efccd20f5710d…

MALICIOUS

PDF

85.3 KB Created: 2021-06-27 03:33:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 3922203f750e5fada3849a64bc59db04 SHA-1: df0595ba9874359c1a8472ea7e6564ca75460771 SHA-256: 3f3efccd20f5710d06ac24c7cffcdb303d4ce15e58bf03166ff74c694977dc44
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 ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress sites and disposable hosting domains. These links likely serve as a lure for phishing attacks or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9834

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://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/e04f282f559c1f350eeaf666fd5f8dd1/19183810344.pdf In PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/hp8nioncrdlv68cvjehl6svdn0/32919369110.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16081600272f77---suwukademanunonakuwarodor.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/afc8aff5aff32371812d9069962ed67b/57416937845.pdfIn PDF document text
    • https://digireg.cn/upload/94088161962.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/56907221260.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e38fa4d26a---dunilujop.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160792f5c88788---lixovabip.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/fde76e13bf77a6691ed3cc5624796360/60815612778.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a299398303---xanopoded.pdfIn PDF document text
    • https://goldenapp.net/file/xezimazupowabakud.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0c20c386e---rokifus.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/kmh1j9dqe7kbjt5b24cl9v0a66/14778511205.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9f9a3c6f5---44120680661.pdfIn PDF document text
    • https://fwullong.com/upfiles/editor/files/mavolixekatiwu.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a67e1958bb9---67167910487.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/kabujife.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/20006694938.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/30809125785.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b1c9699df85---punof.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/47154379130.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160a322475ae39---37142569006.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc04e17eeb---7533860165.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb784b17ba---34201149176.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948fab8fa90---95181180147.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/o6e8mnpdb0a6sksip1dfo5rgjb/24585496588.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/51706566865239efd9cfe86bd27d2583/19201171732.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=time+now+in+rhode+islandPDF 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_off0000eb21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB21 10464 bytes
SHA-256: d2ed1b6bcae81a2bfd6335fd8f79fbb046d1234e1ac8412c784369d718cc54de
font_01_sfnt_off000102ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AD 16772 bytes
SHA-256: b5c97475d6dae45f5d259d4fcf41217cba70d547314215ad735d423b4b9e312c
font_02_sfnt_off00012e73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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