Malicious PDF — malware analysis report

Static analysis result for SHA-256 b844646c35c98c45…

MALICIOUS

PDF

65.0 KB Created: 2021-06-04 12:59:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f118a3d39c766c0564f1fe446b0260b SHA-1: 9cdd30a9855686e79f754aee6d9cbb836221d952 SHA-256: b844646c35c98c45056f556bf4c84d730400462f6f9c6ccccf1546f60236c5fc
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised websites, many of which are hosted on disposable domains or use SEO manipulation tactics. The presence of external URIs and link farms suggests an attempt to redirect users to malicious content, likely for phishing or to download further malware. No scripts were extracted from this sample, but the overall structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8702

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 https://crewmak.ru/uplcv?utm_term=parts+of+speech+worksheet+with+answers
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec33d92765---64196155178.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a61021f2b40---porogopiwoven.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f972e86b75---bikoxofowotawala.pdf
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608689b042101---zamodudimumagevotize.pdf
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160722b2220369---pojebojowalelenanoziku.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/7sr86p65sbt6unklsqohe2o6a1/pifasopupilemit.pdf
    • https://hpsoft.shop/upload/files/makaramorebi.pdf
    • https://karapinarinsaat.net/userfiles/upload/file/ladiruroxobur.pdf
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/8a3e39ca4bcbb0692e4f50864db12ec5/57476938439.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160876e304c04c---sadetemozexupepulopa.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609829dc11714---gamatuludenemunu.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/a47b7o41nch0k4s6p0hj3i9es2/betorotukelimomax.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608acf018de32---zojemisiwifowafo.pdf
    • http://aaaexpressheating.com/userfiles/file/kulanamuzaguzupuxita.pdf
    • http://pileshoppen.dk/userfiles/file/jidevigadakovakutejejoma.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef36f09135---zugatanadofiwikarowelifi.pdf
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/5ccc5b2469afbe8623abef8eb583b31c/46395432950.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ded1.bin
3fabbdd3489653d15bd956a8da6fe7159acec69e4ef4585f73fbdfa4a4368550		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDED1 5228 bytes

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