Malicious PDF — malware analysis report

Static analysis result for SHA-256 00a8eac93111c6fd…

MALICIOUS

PDF

109.8 KB Created: 2021-08-07 15:28:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5ac405e4a375a7581c3c7232675cb7b1 SHA-1: 4a5ff9ae6c3efd89719f515a5822c98da92577ef SHA-256: 00a8eac93111c6fd0155a22f69a48eebd840dea57cc0dab173752373c95973fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm, with many URLs pointing to potentially compromised WordPress upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is unreadable, but the heuristics and URLs suggest a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://llsindia.in/FCKeditor/file/88327997416.pdf In PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/41c8eb4231aa49f20293eab06995bed5/47869918073.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/8c8292f30f5093ccbce473409498a349/jinepikul.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/gexusuxulutezalakokir.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/4419799087.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608803d0a2606---pixonufuwila.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16070589336962---32014677512.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/4eedf8a5e749a872cd25f3eff2f6be25/19656379580.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c19e3ee1596---87932365021.pdfIn PDF document text
    • https://network-italia.com/file/27318036425.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/af790f3884e8cee75abbd8b090af9d69/94887597201.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/lipanabapazupanofur.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/kumixesezorevalexulo.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/5bc21a82b161cf41b1dea4da501fdd52/88310598534.pdfIn PDF document text
    • http://siembra.me/uploads/files/91702554322.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/25095280818.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16083a92532b5b---88170344680.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/06/files/210615165319.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607992e7d1a17---53922701721.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/3e1629a837a2595cffafa3d1cc9443a4/wanogevove.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/joluxaboluxabovup.pdfIn PDF document text
    • http://atsrealtyvietnam.com/upload/files/20518435804.pdfIn PDF document text
    • http://clasesholandes.com/userfiles/file/90053083699.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=manuale+xiaomi+m365+pro+2+vs+ninebot+maxPDF 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_off000143a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143A7 18968 bytes
SHA-256: f07ef741bff1cd28147d4c824ab0109b07d8cf6050979852c3419e8845b006de
font_01_sfnt_off00017478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17478 11408 bytes
SHA-256: 7ed52a5f1dbbf104d685ef6cd7efa7191bb3fb7acf189c32cf242ac2f6190a84
font_02_sfnt_off00018f4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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