Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb8552b8cdb6239f…

MALICIOUS

PDF

61.0 KB Created: 2021-06-02 18:23:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 245cf93a07b5e33f9eb60576fec17a08 SHA-1: 89bda935b065f78a0817e0dc20e015adfe1e8f73 SHA-256: fb8552b8cdb6239fb5c8daef87d11d7e380aa29ec3b07ddb588f88b89ead5782
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains a link farm pointing to numerous websites, many of which are hosted on compromised CMS uploads or disposable domains. The embedded document body text, though heavily garbled, contains references to product names and technical details, suggesting a potential lure for phishing or malware distribution. The presence of numerous external URIs and the link farm structure strongly indicate an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8124

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://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/i3i6fq2hl9gqbs37jh8d7ivdfb/19981140598.pdf In PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d5c7112d9d27355741b2f95addb4f7b1/105149283.pdfIn PDF document text
    • http://porpora.biz/imagenes/imagenes_contenidos/%5C/poxuvidok.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/1903019912.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609442727fe2f---69119173401.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/jamitupiwenamelunelalul.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/b9fc853204540419c8abba180d25868f/wajokexebozekewazogaliw.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a189b09e18d---pubimudapodog.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b2a8d9781---8318198399.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/12425881937.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160766645937aa---90421116006.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/vovdp814hd9tp879731tp5hi2v/38525024087.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a0728d8b9---60819308382.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/sexovadebawaluzuxemis.pdfIn PDF document text
    • http://unsersohn.ch/images/file/sosanirumiwoxuv.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/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=beats+studio+3+wireless+kompatibel+mit+androidPDF 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_off0000d24d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD24D 5612 bytes
SHA-256: 5f864405a530ccc0eb221a02afad5fd0f09c8df8da9be3d3127f9b32015b44da

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