Malicious PDF — malware analysis report

Static analysis result for SHA-256 18c16bf89e9d1604…

MALICIOUS

PDF

111.9 KB Created: 2021-09-06 11:26:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4576701dbe0ffe931b386e01a67f85f7 SHA-1: 54cfcaedf3c766bbcbb23b533ca582d34920a08f SHA-256: 18c16bf89e9d1604a10eeeaa7939d72fa390a17111bd3c8dbb24a173150605e2
124 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV with a Pdf.Phishing.Trojan detection. Static analysis reveals it functions as a link farm, hosting numerous URLs on compromised CMS uploads and disposable hosting. These links likely lead to phishing sites or further malware, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4175

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://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c69ae95591---xejezosigofixekatepimofi.pdf
    • http://travelport.pl/userfiles//file/56312874771.pdf
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/lusefesavifutikobudim.pdf
    • https://majubesar.net/contents//files/29264449616.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/j67tl8vugoi7kt46bpoaspl7s3/liwub.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086a2bb94dab---xakokewitivusovegogiviti.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/k575le8vmouqsdlni5ct7i8jvf/61186091532.pdf
    • http://photou.cc/ckfinder/userfiles/files/zadorabofofu.pdf
    • http://efuturesthai.com/uploads/file/totatujoxirano.pdf
    • https://chptravel.ir/data/file/rogaxuta.pdf
    • http://hanilkwanla.com/uploads/files/98129802039.pdf
    • https://almuhja.net/ckfinder/userfiles/files/vizazodurik.pdf
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/160762c3fe7c8b---medetodemunerelej.pdf
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ce067220af1---dizubedowasefumeze.pdf
    • http://braciszewska-klimek.pl/fck_files/file/98750797567.pdf
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/ba9d540d4180ada2e8dcd65d45b89c9e/zazijoxobetivenivenig.pdf
    • http://alvit-bk.ru/userfiles/file/86270416713.pdf
    • https://dolphinsolutions.net/ckfinder/userfiles/files/xapugamenewumekumep.pdf
    • http://datev.hu/ckfinder/userfiles/files/zalitovilevosu.pdf
    • http://tw-sincere.com/upfiles/editor/files/tavid.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9d17a0684---pikek.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=resistance+board+game+rules+pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000164e4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x164E4 16792 bytes
font_01_sfnt_off00017cfb.bin
d2fc24b269d57de94c35f0d1a6332e4ab87b8b139de70d30c674060e74f543cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17CFB 11248 bytes

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