Malicious PDF — malware analysis report

Static analysis result for SHA-256 2760366add8b11f8…

MALICIOUS

PDF

116.9 KB Created: 2021-04-27 23:14:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d5f9e9d2f03eade5f5563a7fb952b1aa SHA-1: f5d834805b6274239c324c3051b5061c8d015bf9 SHA-256: 2760366add8b11f832340dc0388e9ebcb351f6f8a11f5700b7ac7eb1fd332016
154 Risk Score

Malware Insights

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

The PDF file contains numerous links to compromised websites, many of which host PDF files within plugin upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though partially corrupted, suggests a lure related to 'discussion topics'. No scripts were extracted, but the presence of multiple compromised links points to a link farm or redirection strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8516

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://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/ililm1r8cnj1aof10bq2b797jb/wabevegediporedawe.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/d412096f841b3b4300625900c9888c3d/rabakirub.pdf
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/59797060975b06ef78cb8d3a9a676654/vetanakux.pdf
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/rajsdtis6vnqbc3ghi1obli60u/jagupenibabiviloji.pdf
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4e152f026---lebikogobewole.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0c7e6c06c---xuniw.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/a903da4167380aed6ca6a0ffcca155be/dobilijutejetakadepewe.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/fjbrii9o9d7tjneeggf1ujdb34/detoluzaxak.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa0655eb99---94800191394.pdf
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/757c944769d613e83aafc60ea39d9ad0/8101742488.pdf
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/aa1r1v747km200isivt1rus27s/68028843703.pdf
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/3ea8ce27f2a83e8c9b44794eaa706ad5/gajoredivasunegijuvi.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1606cada4325eb---nofetadubefijaj.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16087df30c1cc1---zazovarademafoparo.pdf
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f765c111d1---84485974498.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e6c98e75a7---riwiguxenuva.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=group+discussion+topics+2018+with+answers
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000190a5.bin
802f511ab97c7459beda71ba6b5cdc2794e6301f48c848f5a6df609e86629cf8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x190A5 5772 bytes
font_01_sfnt_off0001a466.bin
a5fdfec8b2fbe7c7a1deec03656e8a0ff5c7d58a450125d76c61275d03a56796		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A466 11112 bytes

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