Malicious PDF — malware analysis report

Static analysis result for SHA-256 a213e47e081f5d85…

MALICIOUS

PDF

86.8 KB Created: 2021-09-05 06:19:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 19996fc539ec6de80542b2f30635cfc6 SHA-1: 1daf89ebf8c949713ca1351f4fb784569e4a9e1a SHA-256: a213e47e081f5d859e12b96572fa095b22ee52d944f89da699735b1df3a84067
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file that contains numerous links to external websites, many of which are hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it acts as a lure to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://dfanchem.com/upload/files/31286451343.pdf In PDF document text
    • https://biholka.cz/uploades/userfiles/file/67697739915.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160c495b518d05---46693633499.pdfIn PDF document text
    • http://nbkhjc.com/uploads/202108/file/210825232148168823ib05g9h5x4i4.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/c9633a59f5b5b22356cdf1bb08c9ad93/rezaxiwovifi.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/4c01d550eaac12bc7a5e8896d235496a/denomivuvofagadagi.pdfIn PDF document text
    • https://alident.centralcms.cloud/galeria/files/xarekimorob.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/33184764791.pdfIn PDF document text
    • https://ikima.fr/uploads/file/vutamepedar.pdfIn PDF document text
    • https://kildevangen.dk/files/87176873429.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/0h5mff0mssm3k6nc88jv989ps2/25075575261.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/lodopot.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/1kbd0ut8g2eas826bhhqk6nk81/vibopakusefedop.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/2406a39dcb18fd6f7153dccf41b612fc/dipaletavazomizub.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd45795fb6d---29750121189.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802ed082710---fadebawiwiban.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/21285165173.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210623014629_btlogv.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210613_554188D9246D1005.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/52038880139.pdfIn PDF document text
    • https://self-storage.sg/images/uploadedimages/file/59551857676.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/1304053511.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a56575cc303---nonalikowamomoviwi.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/57150725446.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=types+of+marine+ecosystem+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_off0000ed28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED28 18300 bytes
SHA-256: 0a7ea0fd15fbdea5fa100f74a9ad0a75a61af8aebba76b86e38f7622d4806d8d
font_01_sfnt_off00011cc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134DF 10812 bytes
SHA-256: 3c7b92b9f5cd245af3a7cbdb2e6c07e7f2ad717b06e20d92414a01a3853e9f3e

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