Malicious PDF — malware analysis report

Static analysis result for SHA-256 2817d65cd9dcc784…

MALICIOUS

PDF

93.1 KB Created: 2021-06-25 05:57:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: cfad3975332840fa993068f7acfc7013 SHA-1: a79f0fbd5551e2b84a7fe1f770daf50899c4c364 SHA-256: 2817d65cd9dcc784625051953577a762809a6daa86f0bbd04cf902ef9bdf8e16
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 0.9995

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://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/3rj3s9u39jtd1o5j3tik20g0hj/vofobanetixeganubuj.pdf In PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f8d86e2db---58519769427.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/2cm91humu8pk8c8lbisorsck2v/gugewupopukika.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/njj8rcimu5e7r80qkmk72r3hg5/doliw.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca3cd6a9752---xepeduziwore.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/ad74e6eed7951d464911edc5d28ef104/37410266335.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/2311829845.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/56237863511.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/najute.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607658b851a84---mikefavomopipitasadozozo.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a38be9a2c2c---serivonekebajumefunasu.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/21605796468.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3bf5ed0bf---fidabopes.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/271216392.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d29659fcf1---63021202690.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606e180163828---tipivaxenidujeb.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/9389ba5a590539b0a3db4ba7768b0e9d/kawuvawa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=the+english+channel+book+class+7+pdf+downloadPDF 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9C 5644 bytes
SHA-256: 14a12bf7e160dfe1f9fb61aa76b39c534ae58408bc5a251c3c8f97341b6ad71b
font_01_sfnt_off000111e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E5 2252 bytes
SHA-256: ee967336568f77ff61a5ae04097864f25fb24cf77b94457ab20e22408cc95c1c
font_02_sfnt_off00011b4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B4D 11324 bytes
SHA-256: b2c4408e635d93e5bd65ba047f423ab3d5f9782bac63dfa6d0348f0dea560cb6
font_03_sfnt_off0001420b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1420B 16204 bytes
SHA-256: ee21e2d78d30777be7b9f7b66a7e1c3e315243022aed606e5dc726e0f8969ec0
font_04_sfnt_off0001579c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1579C 4104 bytes
SHA-256: 374ef3123ff231a64d355cd53e98d970dc6976caf4cab20b6eb6a6b89bcc72d8

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