Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd6e27e4b7742218…

MALICIOUS

PDF

90.4 KB Created: 2021-05-12 06:13:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7af95762cc3bc816fee89b0010352615 SHA-1: 0ee0160be42d589a8b84475d6f864331b44d58ed SHA-256: fd6e27e4b7742218f80950f971bd0f72a9460ae36376798c6e0f911d74629804
154 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. It contains numerous links, many hosted on compromised WordPress sites, suggesting it functions as a link farm to distribute phishing content or further malware. The document body is heavily obfuscated and contains metadata indicating it was generated by wkhtmltopdf.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9244

Heuristics 5

  • 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
  • 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://chcial.ru/uplcv?utm_term=chocolate+cake+photo++hd
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/68ea73cc77d63a1e97befea8dba6b3e4/19066827264.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/0ae4154e7777ce13012c8f87618295d6/61755804502.pdf
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/332lgiba5hg2cvp19fl5fcop74/52440804298.pdf
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/6c6656c6660ecbc21e9737025483c205/nokaz.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16099aa73f1100---78200810603.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086843186dbf---xanewu.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609835267f4d0---98612556066.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607330f544d11---67396046179.pdf
    • http://www.celso.org/download/tugaxidodok.pdf
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/21fb092ae89a54bcb1768ecccfff2088/53709055787.pdf
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/7l9e6ennnh062i89c6etc1inq7/31193549689.pdf
    • http://bajcsidavidfoto.com/_user/file/vesoxixigibevexokasutovuk.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085088a9026a---beluloxawovanas.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8eb87d8b7---kigadofasipelupu.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609af5485f511---69815040583.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/0a8758cc8b63ca457f20a14b34a1a174/nuzowi.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/fb183f4e01bc4103ee967538536c73b5/farupomiwil.pdf
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16092428b81a56---mufusonenobilet.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/u9euiiub5c2dp2c7bjnm3d2og6/demerurixelekudo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000117e5.bin
6c08cd6d20078cea7b3549339d5ef074eadab38c74889d3624505fd8fe1dc94b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117E5 4608 bytes
font_01_sfnt_off0001279b.bin
65726832143dfdf182d5c519793368e1fe9ff9edf94b4a4af4ed5cb92c5c3ac3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1279B 10132 bytes
font_02_sfnt_off00014a7c.bin
6e3fbd491d8b71441998836ddca0d0c102716a221ea14f8143929167ad9a79b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14A7C 16164 bytes
font_03_sfnt_off00015f91.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15F91 4324 bytes

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