Malicious PDF — malware analysis report

Static analysis result for SHA-256 55bd2a27f8180279…

MALICIOUS

PDF

110.7 KB Created: 2021-06-23 01:42:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 871d3dcb53d79de1f0c0620409764a12 SHA-1: 7f81605b75703f67a5c94126a8169da288a906ed SHA-256: 55bd2a27f81802799304a8b1df30de81bd70958397ba4e0d46dd82f19132810b
154 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The document's structure suggests it functions as a link farm, directing users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9750

Heuristics 5

  • 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
  • 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://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a018d5edd5---59794472300.pdf In PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/9bbu2pii8o2mjps2891kjdest3/43689884145.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/bd54a40c87090dfecf0d42c440fc3895/78376081381.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4999e1d8d---87642507695.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/4g568f73jqtqn8l5qdgf8hl787/wafotivexomededewamekujuj.pdfIn PDF document text
    • https://etimes.mn/uploads/files/65316885848.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/34b7611513a35f02d72c3bc7ddd840bc/dawiperujizeluxutezepe.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/tupipimebuseluke.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988260a689a---boxulariporudolokilej.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/vgfl2d57g3ggrro7g3hbt648e4/62519483154.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b181e4188e---bewopize.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/62834552065.pdfIn PDF document text
    • http://xn--szabowski-tub.pl/userfiles/file/falaxiberudazadukudug.pdfIn PDF document text
    • https://baobihungphu.com/media/ftp/file/12544272285.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/9927675744.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/cf6c0a6de40159498dd1601f7307e0ee/kijon.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=pdf+in+archicadPDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001a715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A715 4900 bytes
SHA-256: 3c9a6eb4d1d307ea2e90a7fd891ffc63999b8d53594816e98b11d80a4c14dbaf

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