Malicious PDF — malware analysis report

Static analysis result for SHA-256 69a3f307c5b64458…

MALICIOUS

PDF

70.7 KB Created: 2021-08-21 03:09:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6ab99c95e5d8d747b1a76309286d1e17 SHA-1: 969b2256fa4b11673b5dc489477cf32d532ea067 SHA-256: 69a3f307c5b644587f1e22bb17bf814b5a1aee5b377c549b2e45f2f937c43c6b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, directing users to multiple compromised websites and disposable hosting domains, likely for further exploitation or malware delivery. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest an attempt to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6543

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://smidgel.ru/uplcv?utm_term=reparacion+de+computadoras+automotrices+avenida+r1
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/1f0ed88fefe86ae3a3075d11ef9fc5ed/leremijulevugiporagida.pdf
    • http://leinerpakgelatine.com/survey/userfiles/files/tajulatakezimumatulipabaf.pdf
    • https://la-klamm.org/userfiles/file/gijiwaperejidisukoku.pdf
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/4c3045f89eb485e951fb1a1f45f15d72/36472818578.pdf
    • https://nedimgame.com/calisma2/files/uploads/vekikojowaxazaza.pdf
    • https://baxsporthorses.com/userfiles/file/7064130852.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160db40a7c8613---wisawosenuweporuruseloj.pdf
    • http://fapannimario.it/userfiles/files/jipifigixuxunametibugume.pdf
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/10436781981.pdf
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/9aa3c305c652cb5c4b2650e1647930ab/59886613919.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/rinsmot4uoj7nsnjn82kkbvfcp/busufilopobu.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b425bf89408---52788136127.pdf
    • https://vsetinrally.cz/userfiles/file/jowowifadiwe.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f80fb55b911---bomibotutisunenesu.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/fdf3168e486514ca614989f8f65c8201/rijivorigujegomulorodu.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8b33251b3---berokamofilamokeli.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/9492a551e4467a585aec8baa696571c7/wipekanawapiluvexaxuke.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_off0000d1f9.bin
31fa36a3320786b08b1ad8550e18d3f4a66d3d3f0931b7cc88e759f805d1660e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F9 10892 bytes
font_01_sfnt_off0000eb47.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB47 16792 bytes

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