Malicious PDF — malware analysis report

Static analysis result for SHA-256 165a3a8268a940e1…

MALICIOUS

PDF

79.8 KB Created: 2021-09-04 19:05:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fc4cbda305b1ff881a0ae03e681b8ac6 SHA-1: 7820bd3a687a846bb9c97f5b565d50944fb502cc SHA-256: 165a3a8268a940e125802b2149bfee96f8d41c040188a6a50c6771b37ae8cf0b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised CMS uploads or disposable hosting. The primary purpose seems to be redirecting users to potentially malicious content, aligning with a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6056

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://mokshadhamnepal.org/userfiles/files/68135381022.pdf
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ede6ec64f6---957377957.pdf
    • https://chetanaus.org/bheru/uploadfiles/file/47627525386.pdf
    • http://naturalmis.com/userfiles/file/94679662820.pdf
    • http://geoplan.su/userfiles/file/87053989336.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/36f918d9108ae7a3ae0ac0926eae3ed9/57763606138.pdf
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097a5fdd6132---14233985243.pdf
    • http://satbietthu.com/luutru/files/79320152983.pdf
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082a6740cd28---bilegijiruja.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/8073488ef1d7867d39542cac618ae102/3434391294.pdf
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/gijaxu.pdf
    • https://krossi.ru/images/content/files/79930530388.pdf
    • https://moyaexpresss.com/ckfinder/userfiles/files/45368496760.pdf
    • http://hbtsap.com/Upfiles/news/file///55200134061.pdf
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/000157679306344547030b4a4fabf5a7/konaxetij.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16107950e21ddf---38738017210.pdf
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/lc2jtc7v5fndd22nihpunvqfd5/monepoja.pdf
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/85f0c7b58fedb6c0bb15850b29941c27/64798554405.pdf
    • https://ozmutludokum.com/userfiles/file/99023729425.pdf
    • http://sunnysideclassof64.com/clients/a/ac/acc4ccb49d7935ca36198347b895393e/File/wakoredix.pdf
    • http://e-sheremet.com/img/xowulisegufu.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/40d1mmej49femalojosgfqenpm/45605107629.pdf
    • https://ever-progress.com/upload/files/xezukupufepuvavexevowo.pdf
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8775d12cb11c07fa3d44e93b4e9721c2/93474348266.pdf
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/ruwawobali.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=metric+system+review+worksheet+answers
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011496.bin
8c31b3979d803ba2ca5fcadd036afb2e53eee21f99a2471ac74a391652a560d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11496 10800 bytes

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