Malicious PDF — malware analysis report

Static analysis result for SHA-256 d515e3d27ec8892c…

MALICIOUS

PDF

124.5 KB Created: 2021-06-23 22:24:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aa8b22959460a0613218093830a2c2c8 SHA-1: 766d55e583c6aa210f5550c4e7a6b338cc1e7c26 SHA-256: d515e3d27ec8892c71d330886e7641d4a333e524c36a6756606938b8811ef754
154 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, and the document body was heavily garbled, making it difficult to ascertain the exact lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8306

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://archism.ru/uplcv?utm_term=kamado+tanjiro+no+uta+piano
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d2ee2b302---lolevatiriraxi.pdf
    • http://backupcenters.com/userfiles/file/kizasumetazuro.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160adbb8dd9705---93093451210.pdf
    • http://aardbeienfeesten.nl/uploadimages/files/397973488.pdf
    • http://ei-windykacja.pl/upload/file/2200904505.pdf
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/bogigewazubonebigolenex.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160a71b031af7d---86209919517.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160b472a584757---norunepifizuw.pdf
    • https://baobihungphu.com/media/ftp/file/75082405621.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a21d6c7711f---vodok.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160abf3b2b725c---kibonipovixotonafuvop.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160785cacc25c0---81731630611.pdf
    • http://bishnutoursandtravels.in/userfiles/file/topabemaledibo.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed57b2bf4e---marur.pdf
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/66635714067.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.opentle.org
    • http://scripts.sil.org/OFL
    • http://www.gnu.org/licenses/gpl.html

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000144e7.bin
92d0dc9b72c387a9f98cb6f240a1658212e126b8e9325390542607a75a76e9e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x144E7 28656 bytes
font_01_sfnt_off00019fff.bin
06ff2bf683a2775f2f457257e2c5e1295f83ae2864ae92a8367295ccb624fdc9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19FFF 4940 bytes
font_02_sfnt_off0001b0b2.bin
78bc9d78312ec0bcff55db7ae4e14505e8686f51b21d36af2ca59e053a973642		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B0B2 7684 bytes

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