Malicious PDF — malware analysis report

Static analysis result for SHA-256 57bf69422c1ab480…

MALICIOUS

PDF

80.0 KB Created: 2021-09-19 23:00:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e89c94e688565fc2543a063e5c244c85 SHA-1: cb4d416b8d5adf9f87e9096120f4083bc82aa248 SHA-256: 57bf69422c1ab480692f98274239bb5c90747f93ddd2700272fc4f5207de1c88
124 Risk Score

Malware Insights

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

The file was detected as a phishing trojan by ClamAV. Static analysis revealed it functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. These links are likely intended to redirect users to malicious content, such as phishing pages or malware downloads.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3897

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://lamorenj.com/userfiles/files/37120357071.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1210074b2---boneko.pdf
    • http://jamones-luna.shopcloud.es/ckfinder/userfiles/files/dasonetawepozolima.pdf
    • http://korea-seals.com/ckfinder/userfiles/files/biwozejew.pdf
    • http://jyjwqj.com/uploadfile/file///2021091203060179.pdf
    • https://perfecthospitals.org/FCKeditor/file/pivibofewexatewev.pdf
    • https://marblo.marblobaths.ph/app/webroot/img/files/degorovo.pdf
    • https://travelworld.ro/userfiles/file/69719316333.pdf
    • http://knshzj.com/CKEdit/upload/files/91701708217.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/f67d617da48468a1ed91979f43e9fec3/89462980952.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/5boro5gl2b5klbc9gu8j43fja2/bufusonomulitozo.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136bbaacf600---57954780246.pdf
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/789bc2278ee7bada88558591bec40fec/39745190470.pdf
    • https://confidence-ist.com/ckfinder/userfiles/files/pemiwirupugomomopen.pdf
    • https://liepasmuiza.lv/userfiles/library/20715696498.pdf
    • http://americandeliorder.com/uploads/files/wigubivefegome.pdf
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb2687893e---34076182741.pdf
    • https://valeaflorilor.ro/img/uploads/file/nekuxanipipisubazu.pdf
    • http://merwepizza.com/upload/file/26162053477.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614287d5a7553---74489945988.pdf
    • http://puebloexec.com/userfiles/file/levive.pdf
    • http://kolkandkolkdesign.com/site/data/ws/files/katadosuwuwuwujexipalu.pdf
    • http://abc-tel.ru/data/File/26475779009.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=android+auto+custom+apps
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e89a.bin
c5b24a7e57d3aa8e4ef16b3acc0a8f4500405b3ea1e976347e6f60257b3d29d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE89A 10576 bytes
font_01_sfnt_off000100bf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100BF 16792 bytes
font_02_sfnt_off000118d1.bin
c740461f754ce51e5f854c4ccc987abeb6c7a5a8360416d780d806d4ac59bb69		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118D1 17436 bytes

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