Malicious PDF — malware analysis report

Static analysis result for SHA-256 f356d5cd9b7c341b…

MALICIOUS

PDF

78.8 KB Created: 2021-08-11 07:24:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9edfb9f2b87da6a2af17e66dabeda863 SHA-1: 4fe2040ebafec079dc5bc4324b4610255890a4f1 SHA-256: f356d5cd9b7c341b862a68f8d1483e3d74ffbf57382b27be448b6a96890c4104
154 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of multiple distinct hosts and a high number of links per host indicates a coordinated effort for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7669

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 http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad3ccb2fc1a---26970685567.pdf In PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/vivale.pdfIn PDF document text
    • http://lovellreunion.com/clients/4/42/420738e4954c29d3cfd02fdb1bc9139f/File/rinukepenibonibikov.pdfIn PDF document text
    • http://tbvshungviet.com/upload/files/jefoboxidonilopizu.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/26482196081.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/30274ac1d8febb3657e4b44fada036ca/lujeparefuzamegapovo.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610bb4826b2b0---4396728426.pdfIn PDF document text
    • http://linhkienhunganh.vn/luutru/files/94724457932.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/7504424940.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/26300598255d36c39f6007fefebdac40/vepokiw.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c23b54816---sidezoxitusil.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c038747d9f7---miwikisevafanibemoma.pdfIn PDF document text
    • http://ahchala.com/img/file/pinaki.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab991199e9f---vejubedepifidibojeserirad.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160cb257b865a1---89331554855.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/77d574bd861861a72c0d4b28a153e524/30872335866.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098324f53906---60790938762.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/bimadenudar.pdfIn PDF document text
    • http://allasclub.com/campannas/file/makuvatusifokusaxukexo.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e97e864fd---zabevuduwikusepomezofozu.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/vobabijokaxozufuledo.pdfIn PDF document text
    • https://bibonatura.hu/ckfinder/userfiles/files/679682860.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+write+chinese+strokesPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000118ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118CE 10288 bytes
SHA-256: 18c66209973f8f049f7dad6bee392e46f4f1ffb14c08a033e873343bc4704e36

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