Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb6695cba5b661b9…

MALICIOUS

PDF

62.5 KB Created: 2021-06-01 20:58:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 9c7b0d1334b0a1f07524d31c739eb5b2 SHA-1: d4fe5bee47c50d101bca7c5d29c71ee2db42316c SHA-256: fb6695cba5b661b9fe4b80adbe0b790d594e5002eb5169a8ea00dd0050fa5663
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to multiple compromised WordPress upload locations and disposable hosting sites, likely to serve malicious content. The embedded URLs and the overall structure suggest an attempt to disguise malicious downloads as legitimate files, such as "business statistics a first course 3rd edition pdf".

Machine Learning

  • Nyx PDF Classifier malicious score 0.8563

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://jetaime-shop.com/files/rulizabolijenisu.pdf In PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607a775b9b4f1---78203234746.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089bfd3aff12---bizixapumugiviniruwuxasi.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/wuwebebeme.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608c45721bc86---74794470565.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/neliweten.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/dupilipakafawuremuvuda.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/834a3106abb7815e54c398a52d57a840/84921486139.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/803e6ea108792efd5bf84aeb68a754bb/62073520949.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608121f4dff54---nekeronu.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/35475910184.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/85281023363.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9baadc888---65781285816.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/S30rS-6n6vg/uplcv?utm_term=business+statistics+a+first+course+3rd+edition+pdfPDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE2 5332 bytes
SHA-256: 837dc23376f1078d9551e77094ef1f6f72dcd97b5c4358a074f9ef7cf1059d16
font_01_sfnt_off0000dd13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD13 10016 bytes
SHA-256: d3bb4099b02cc5fd8585a063e066e50f460e1279881112a26fdcc18af855baf4

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