Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c4bfcc12aa6e4be…

MALICIOUS

PDF

80.6 KB Created: 2021-09-19 23:30:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f1870baae496e90401b38f33f6d9c1d5 SHA-1: 342e109c06aa903a63708a1e9535985ee35765a3 SHA-256: 4c4bfcc12aa6e4be8227de6be2cc3a718b1ebf26c72aabde29a2065cba66ff38
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous links to external websites, many hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. While no scripts were explicitly extracted, the nature of the links and the PDF structure suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://scuderieverdina.it/scuderia/userfiles/file/21395242921.pdf In PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/47963866953.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145d4fde5254---tepoxuvitifomegawubid.pdfIn PDF document text
    • http://drprdesaihospital.com/uploads/woranofijib.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210911_D66992999E45500B.pdfIn PDF document text
    • http://sinosteelcode.com/filespath/files/20210907072217.pdfIn PDF document text
    • http://abpaluso.com/upload/file/kopexebefavaj.pdfIn PDF document text
    • https://kristinanamaste.eu/files/42997487176.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce4dae4e25---43985442125.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16134c72abb7c0---vodafelumaxajew.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/161353d6debe40---pejagubozarorubinoti.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/xanopale.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/0e3c192130a0fdd6b47697b3602d8c79/75687039092.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fimusurur.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/jilovikodogu.pdfIn PDF document text
    • http://cabanagarden.hu/editor_up/25370443972.pdfIn PDF document text
    • https://rakowka.pl/userfiles/file/4433004277.pdfIn PDF document text
    • http://jogagongu.pl/userfiles/file/suxubifew.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/84734770748.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612eff8e3a21f---67027686138.pdfIn PDF document text
    • https://rolcsi-bau.hu/userfiles/files/gozemivimuwokov.pdfIn PDF document text
    • http://recit-de-vie.fr/userfiles/file/95986705902.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210916021102417.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=marsden+and+tromba+vector+calculus+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_off0000d436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD436 18248 bytes
SHA-256: d14735de79c32453ba411503685d6e4f378131eddd961745ac54328bd014eda9
font_01_sfnt_off00010343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10343 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B5A 10988 bytes
SHA-256: 51857f64b66e4ef24e413006af105edefbc60775b61a0be6ab940f1affbdcf89

Open this report in the interactive analyzer, or submit your own file for analysis.