Malicious PDF — malware analysis report

Static analysis result for SHA-256 158d5c4e8069a390…

MALICIOUS

PDF

88.6 KB Created: 2021-08-14 22:22:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fe97fad5c36ddc198d8fe391bf58201c SHA-1: b4565ca5b8fe91cf15c46a4709ef771e84e369db SHA-256: 158d5c4e8069a390c4baa15739cc1313dcbe5be37ba422e73d738add20f543e4
124 Risk Score

Malware Insights

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

The file is identified as a PDF containing a link farm, with multiple heuristics indicating its suspicious nature. The PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics suggest that the document is designed to host numerous links, potentially on compromised or disposable infrastructure, to redirect users to malicious content. The ClamAV detection further confirms its malicious classification as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3704

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://kurek-rowery.pl/user_pict/file/digaxogi.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab295c6f833---gawusosogu.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/4259a355a13331ce1cc31bd9e7b10359/zimunaligerabo.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160ada8e54a9b6---girilami.pdf
    • http://movietek.vn/hinh-anh/files/nesojezebadira.pdf
    • http://remaining-mc.de/userfiles/file/solomamafevozoliba.pdf
    • http://abbuffalowings.com/uploads/files/milita.pdf
    • http://anandamsanyal.com/userfiles/file/telodiwedud.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160719f6261d7b---jewitegeros.pdf
    • http://mwflower.com/upimagesfile///27232218049.pdf
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/0c43bc2ac28d1a2506feb1a483eaa517/tifujevidisatuxejapiwumil.pdf
    • https://alyosserspneed.com/userfiles/files/19911711615.pdf
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/s7dqaq2k0imbh8951gjpoopmm5/sozej.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdcc288051---69287107432.pdf
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/fa12a4d93ad2f94ec2f10d73b25009b4/17315581581.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/avlc1gs86k018s8j1inroqupg3/84065092463.pdf
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dijotokurej.pdf
    • http://world-green-hope.com/uploads/files/76059119122.pdf
    • https://aydin-elektrik.com/resimler/files/86104256428.pdf
    • http://medob.org/SITE/files/editor/file/18984293027.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c87181962ef---13538090991.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16075e2c515cfc---zitusarubivedobisipa.pdf
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/62644054868.pdf
    • https://rdsdealers.com/ckfinder/userfiles/files/gufosezanesulepojakeje.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=samsung+s9+android+10+release+date
    • 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_off0001041e.bin
48d6b5928b1bcd49d7a19606cc0de671e26064d0e12c20670c364e9238342a70		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1041E 11108 bytes
font_01_sfnt_off00011dcd.bin
e263c8fb4d9f2b5045bb779bde74e3b5ef826b2f9da4b96431cbc155ec01aa8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DCD 16892 bytes
font_02_sfnt_off00014a10.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14A10 16792 bytes

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