Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cb49054111326ea…

MALICIOUS

PDF

70.5 KB Created: 2021-09-06 11:09:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d5324d00b6a606ad33ca909491df7162 SHA-1: 75a111068b9b8b0e3ea36216ffae213a6cf0a3d0 SHA-256: 8cb49054111326eab217062e757e6cd2dfc0fcee8594e7068c8c8fbb67c5f683
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://fishtech.org/uploads/userfiles/file/file/tawibuvenutoxut.pdf In PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16124f556a006f---20936064527.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805b45ae495---75581739303.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/16676300450.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/6e44137591a91da3e955da5af08cccf0/40134842707.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160821887b2b75---27815817258.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7350b8159---fomofamolosifedexegu.pdfIn PDF document text
    • http://scsytech.com/upload/files/56262216562.pdfIn PDF document text
    • http://enricobarraco.com/files/runiloxoperosazeduvu.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fccf962ad81---jamukimavexebolesawuguze.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca10264e8c---bovuwudovukopibifoga.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af4a341a231---29235077218.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/2995bc7167200c585897e83397dd16db/gazulefajabal.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b23b5fd55ae---36530849254.pdfIn PDF document text
    • http://au-zlato.sk/upload/files/ziwakakegip.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/58955352021.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/76580597026.pdfIn PDF document text
    • http://twinmd.ru/userfiles/file/30032697821.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802fe473c03---5538103321.pdfIn PDF document text
    • https://pasarantogelsatu.com/contents//files/81266102087.pdfIn PDF document text
    • https://ever-progress.dacola.com/upload/files/72702498113.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/sedigep.pdfIn PDF document text
    • http://446888.top/userfiles/file/67326364089.pdfIn PDF document text
    • http://ewinghighclassof1963.com/clients/e/e4/e4cb61fc1babc639533983e887b7272d/File/mamapawubizutenaxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=manual+licenciamento+fepamPDF 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_off0000b82d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB82D 10464 bytes
SHA-256: 9350b0a3d06eb6b10e5b93b252a48fd49a39a0ac18d4c49bff65eb75a2ba3554
font_01_sfnt_off0000cfec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e7fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FE 14504 bytes
SHA-256: cc8400d920bfa21d7107109d24848e0b84a0a538042e79de88d8d92103885e00

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