Malicious PDF — malware analysis report

Static analysis result for SHA-256 48f8d5cd3c799d54…

MALICIOUS

PDF

84.7 KB Created: 2021-07-02 08:52:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: fca78d76ea23e7d4d80e7b8bacef7664 SHA-1: ac5e7bd79a418927169593f3b9c0b41775798577 SHA-256: 48f8d5cd3c799d5446ee8aa4aefbd1e1f611cf69314190aeb8cbe4178b6d7f6b
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites. These links likely serve to redirect users to malicious content or phishing pages, a common tactic for SEO poisoning or distributing malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a18643ab53---fodajekosowig.pdf In PDF document text
    • http://xiaohecollege.com/d/files/jifusofavogiwu.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/nejenumibubagavuradur.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b191aa8d16e---pizolomadoluvuvarado.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/lodirezodebin.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/tamakigagot.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160de69734ac11---87959916093.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210701_0F0C29484C438C72.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/b9p3vsajcus86qn3hf05ibkff7/83521844166.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/91545648246.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/12605563118.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfcf7472251---34600556977.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/68683261643.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/vc17ics9hllpvas3mra6n3hj0d/84669789894.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b62aab7552---49203974201.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b5ab0ae6a---zesezade.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/98723f0164c8bbbada714d7fd2df15bb/76853278963.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab0fc7f5b7---fivelalurabowul.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/54t1kl43qaqt9ipmf4076ln51v/pukoreboxakabimugus.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6afb69aae---54260512295.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/16098a4fc434df---xawofebetuzivuv.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/bec49d182d57682ad28dda6d48f435ee/tejag.pdfIn PDF document text
    • http://rjt1.org/upload/files/4574966336.pdfIn PDF document text
    • http://www.buildingmalawi.com/images/uploaded/documents/13833137091.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=trimming+shrubs+in+winterPDF 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_off0000ea8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A2 10516 bytes
SHA-256: a209a305da1280d615622f5b5cdcf5220ad7b4921650d95af6fe10ab2a30135f
font_02_sfnt_off00011a63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A63 16704 bytes
SHA-256: 6eaa6cbaec55a1f3d04717d6ad0c43aa4af8d256b4ce88a2a915c82a40daeb8c

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