Malicious PDF — malware analysis report

Static analysis result for SHA-256 f17d64418c060a0b…

MALICIOUS

PDF

83.4 KB Created: 2021-07-03 04:53:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 92bf467434ae38f9d7cbadc722c15ae9 SHA-1: f28bf13f3ed036a2c283b11bc9a7a11081868e39 SHA-256: f17d64418c060a0b51632b004e4a1431320b05352801e4a6915f12b916753f5e
164 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised CMS platforms. The document's structure and the presence of multiple external URIs suggest an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/0f2d2353048183352f3ad09de4398f28/tuxomutos.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089f5b9a8f60---31059364291.pdf
    • https://plasy.com/uploads/file/73062362222.pdf
    • https://cottonweb.net/userfiles/file/gotejigiriwelilinin.pdf
    • https://grandhotelbulgaria.com/userfiles/file/12922044992.pdf
    • http://www.asap-recruitment.net/upload/file/fidopupebak.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d8cde9aee---pirokilesitizod.pdf
    • http://moriefrusca.com/userfiles/files/82059047330.pdf
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/i0qtpnnn7v9lqenbh2jmjkpf16/larafona.pdf
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16090f3e992da1---89006770351.pdf
    • https://perfecthospitals.org/FCKeditor/file/46250826906.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094be573801a---73810011708.pdf
    • http://apsencollege.org/test/fckeditor/file/sufodeg.pdf
    • http://vejwun.cz/images/53231658135.pdf
    • https://varbackaforskola.se/ckfinder/userfiles/files/wigefumefed.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/vmm2d0cjj2kl4hrjjod2n02ci1/1934184207.pdf
    • http://aeronautike.com/userfiles/file/27927826536.pdf
    • http://agendatourvietnam.com/hinhanh/file/sapofetesogeka.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/f26022c9f7d34eb31adca5d9e62fe629/fodudepijeledefala.pdf
    • https://mobile-translator.eu/app/webroot/media/files/wujawefu.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/f29b3775d89e89dcd396e2b2383792b4/nomulitetozaza.pdf
    • http://ahcxdq.com/uploads/file/070352346723.pdf
    • http://fly.no1-yes.com/userfiles/file/kazum.pdf
    • http://jjmcp.jp/userfiles/Image/file/70443195222.pdf
    • https://karinbentum.nl/uploads/file/67238004040.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=fastest+lizard+in+the+world
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • 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_off0000e243.bin
ae77e3805ec21621daf25d0ed03aa2f30219a43769713e60ed4a0e3c9ac3a362
pdf-font-stream PDF embedded font (sfnt) at offset 0xE243 10468 bytes
font_01_sfnt_off0000fa0b.bin
c65a10d52842ca92e11ec725a36a07b342038399bda8717bf82d0134763a3112
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0B 17620 bytes
font_02_sfnt_off00012848.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12848 16792 bytes