Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d853765ce8b9784…

MALICIOUS

PDF

97.9 KB Created: 2021-06-18 11:54:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b59239c8dd2cd46260192c8337f05a67 SHA-1: 3aab081b96bbbee0b0346d054ee3c86a5ae11b2c SHA-256: 3d853765ce8b97844c7f4ce2f4078cfd188572e3cd52e2eb072df1f48f01b75c
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, which in turn host other malicious PDFs. This behavior is indicative of a phishing or malware distribution campaign, likely initiated via spearphishing. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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
  • 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 http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/b6273c87fa9f3c753a323b5c82918b72/mogisepawiwazagiduw.pdf
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1e827c680---14707570688.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9c2907b61---zanupaxobimovetolemaduwo.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/agshai2dn5b075a4am0ompup9l/10987890187.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087009bb1575---fexadorefag.pdf
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/a9qesvqcd3qc05e47iksbth8j2/64654303968.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/db088c4ff655783defc2f37e8e33de4e/15770089435.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afda538f421---11433891360.pdf
    • https://atcotourismtravel.com/userfiles/file/zofujexofamunoselilax.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/0accbc023bb95ff85cd8b9398aa05cf6/tukimobegalizijilafujaw.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b0576f3d2---loxumazeje.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160acd859eb856---darinififitijukejoguxora.pdf
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/22ce3a1809e2d0e1200dfa16fae33594/44008592246.pdf
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/ec80embcs706rakdqdt180f053/10224263454.pdf
    • https://bandai-k.com/userfiles/file/67190850008.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f5d6a677a---saguxolojuk.pdf
    • http://firanywiktoria.pl/uploads/editor/file/21799685218.pdf
    • https://zlatartopalovic.rs//files/riwaxopisitemolesexapasu.pdf
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2a9696efb---daxuvesagiv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://smc.org.in)MeeraRegularMeera2016SMC7.0.0+20171102Hussain
    • http://smc.org.inhttp://smc.org.in
    • http://fedorahosted.org/lohit
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=malayali+manka+competition+questions
    • 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://scripts.sil.org/OFL
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • https://gitlab.com/smc/meera/blob/master/COPYING

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f06.bin
811fc4390dd6508800803e8f89fd0cf2ac140d50bd979f5e5414a1fdea3739a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F06 5280 bytes
font_01_sfnt_off000120c7.bin
58765afbf79dfac18aa2be5657ba4048cf3b195f9206c7e7e4c9fcdb971a68cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120C7 6340 bytes
font_02_sfnt_off00013051.bin
3cfe3df454d71fa5e819ca3ab16bea8bb03ed8f7822a67ad809e560a069f37f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13051 4980 bytes
font_03_sfnt_off000142a7.bin
87068d85b5ccddce9990f7d84d0c3fe11cba01b24f568f339dcfcad10eff5c7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x142A7 11256 bytes
font_04_sfnt_off000168ed.bin
1932a85b3a598f14f3a849e65b15a5b10defa238df8c61dceb02d1b4220837e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x168ED 4272 bytes

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