Malicious PDF — malware analysis report

Static analysis result for SHA-256 b336e3e5804b21b4…

MALICIOUS

PDF

77.5 KB Created: 2021-06-08 05:54:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e18a7a9ac6e4d3b00868f3290da58f66 SHA-1: 965980186f3b81f77f67c1a71046c750a6c1ab49 SHA-256: b336e3e5804b21b41b3dafa9640aadb081aa6c44d106f408b8ef72fad23947f5
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, embedding numerous URLs that point to compromised CMS upload directories, likely to host and distribute further malicious content or phishing pages. The presence of these links and the overall structure suggest an attempt to lure users to external, untrusted sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8121

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://pixomot.ru/uplcv?utm_term=dio+oh+you%2527re+approaching+me+japanese+script
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b28e1d0d616---bogazibepelazegegebawoloj.pdf
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/27d200c747d47379cbd7ec2cc9614d13/nuparoworozegumefefusarix.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/ef96a614efaa3b3514aa27ad20632877/73823443555.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a3cceceff7e---83770104629.pdf
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609226d1bdfac---17239700611.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160abec74d85b6---pulilibekeju.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/8os084nllvlp819cv34pp8veo3/miwulixerewesatoru.pdf
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/sbd88h1qtjrbchrpl0rnuqp6nk/xeleputejuxoma.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/db155a40058494273a3a4dbe5f0dedcb/727642897.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8bc008f7eb---buduzepetujuledevulelu.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a15c15db1ed---jikokir.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/vvffj33n0vhl6ebu5098d4a6q2/84385213108.pdf
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/0e83e854b5851a0d48b124eb42048195/vijaxifizipalibuguj.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/pd8si4egmmuunhh995c914fq02/27758126513.pdf
    • http://mopron.ru/upload/files/riwabomukiwal.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9b6.bin
edf517a561ed5132c6c1d5718ac6ff9d870a00e6f43a91762fd168a2279cca75		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B6 6440 bytes
font_01_sfnt_off0000f97c.bin
6a5c853dac0d8d76af9c2a62e868928e78c4130f5ed675e07d98eb9fbc5f690a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF97C 14796 bytes
font_02_sfnt_off00012839.bin
ea71275d8f329ef5675552769be8afe19f81827a6f98b47bcc12227e2255a088		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12839 5408 bytes

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