Malicious PDF — malware analysis report

Static analysis result for SHA-256 37c8b125035e1783…

MALICIOUS

PDF

83.2 KB Created: 2021-07-23 04:41:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ef88b517b63857dfbd0e761a213c5a25 SHA-1: c4032c800758308fc1c7569d17d3c94f11eca37b SHA-256: 37c8b125035e17832ad11cf8986c4e0e944e3c11cc1f6a9e62c4e95bb4565e75
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised websites or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure as a link farm is consistent with luring users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9647

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://tecsun-moscow.ru/docs/file/gopumuvugabe.pdf
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/78eb1d52a154949d0666c5b08223b314/12397855284.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdf81ce1c9---68056418449.pdf
    • https://dcoderesearch.com/uploads/95668345194.pdf
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c2be8ce6d56---xejebogirudilakesoboxokiw.pdf
    • http://champaigncursillo.com/userfiles/file/vusuzusove.pdf
    • http://akkoryazilim.com/userfiles/file/54779414322.pdf
    • https://egyiksem.hu/uploads/file/11028772592.pdf
    • http://alacarte-grafik.de/userfiles/file/debur.pdf
    • http://yokohama-model.com/userfiles/files/17799999100.pdf
    • http://thehonourride.ca/clients/c/c2/c2a221447f3e921143a55eca482c8289/File/64026408061.pdf
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afda4167ae3---sefelanumit.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/100b25r2c9svt64m29bubcadik/favevatefenebemen.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f5f43b9da---janujazoseliwoxa.pdf
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zisokiravelazomasap.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a06eb8660---34038712507.pdf
    • http://hydrem.ru/images/file/napilowoziferitaleva.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/a5cfbc0bc62f30ddc0a0440bbe084740/mibixuxis.pdf
    • https://apoiotelecom.com/imagens/img_fckeditor/file/guxogovirofen.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d426c385f---wejizomitananeg.pdf
    • https://fallsplat.se/file/49130473704.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a8f2be41bab---vudipokelapatitilorov.pdf
    • https://alajuusa.ee/media/contents/file/25029804928.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=understanding+the+book+of+esther+pdf
    • 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_off0000f254.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF254 16792 bytes
font_01_sfnt_off00010a6b.bin
835c26f606fda894a4499bddbba3a6fb0d17745e51ce3021672f319194949450		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6B 10972 bytes
font_02_sfnt_off0001235d.bin
1dbb1e4683867cce985c6052a68cd6e5fae895ce0dda47c3d3e79567eb109b8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1235D 18660 bytes

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