Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8b51dfc3e80eb68…

MALICIOUS

PDF

101.7 KB Created: 2021-09-20 17:32:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f9c5b2e3911c23881bca7d7d2e200aa7 SHA-1: 3744d0be92b5a5ab12080b90ff7a7b3c7ecde0c2 SHA-256: d8b51dfc3e80eb6803c8f1fc1a28a5377744331ff6b73c68c04528d7bc144253
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to obscure malicious destinations. ClamAV and ML classifiers strongly indicate malicious content. While no scripts were directly extracted, the PDF structure and link farm heuristics suggest it's designed to redirect users to potentially malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161417265ee269---17129690897.pdf In PDF document text
    • https://fanaf.com/article_ressources/file/77905919268.pdfIn PDF document text
    • https://hijaulumut.com/contents/files/28394424304.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/xazajaxu.pdfIn PDF document text
    • https://ezgoe.com/10005001208290177/ckfinder/userfiles/files/piganitavexupefunigiwalij.pdfIn PDF document text
    • http://tataservice.it/userfiles/file/79742220362.pdfIn PDF document text
    • http://cuathepvangohaiduong.com/images/ckeditor/files/71209701950.pdfIn PDF document text
    • http://getsolarny.com/userfiles/file/bozababaliwi.pdfIn PDF document text
    • http://konberdbio.com/upload/files/xefinusosulo.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/jomefuras.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e86bc3ac6---kelekurobajimevevus.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/vufasaxeje.pdfIn PDF document text
    • https://hexema.com/FCKeditor/file/bitif.pdfIn PDF document text
    • http://sbkf.org/files/files/baxeponijafibe.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/64951398731.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/ridazal.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/dizokuluzefolu.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/besoparalaguwixi.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/a7d7243854ccf5b20e6013b8870ef756/43133141347.pdfIn PDF document text
    • https://ra7a7p-h3ba7.com/contents/files/74743721281.pdfIn PDF document text
    • http://gamebonda.com/ckupload/files/sifofofetedaxuriz.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/xenifevejezidukixifipodu.pdfIn PDF document text
    • https://serviceelectric.ca/userfiles/file/sezivixagewidadov.pdfIn PDF document text
    • https://durimawar.com/contents/files/kifin.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/98643740221.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=biology+exploring+the+diversity+of+life+fourth+canadian+edition+pdfPDF 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_off00012267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12267 19016 bytes
SHA-256: 6434c31b54f7e4842315e2e8b18579ec654674fc28209cf8b2e51b76efc9e954
font_01_sfnt_off000153af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016bc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BC6 11336 bytes
SHA-256: 3442c72dcd32c882f4dddeb77ad28b52ecb08a7fa2844b5febfba2446799c745

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