Malicious PDF — malware analysis report

Static analysis result for SHA-256 993ba6b6a6be32dc…

MALICIOUS

PDF

63.6 KB Created: 2021-05-17 09:58:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 429cb617b9826821d3ad37a5899ab566 SHA-1: 1686ba07b74551863431052eb90fa0b32729d93d SHA-256: 993ba6b6a6be32dc36891fcb7d37218c48fb9d01d846477373b56976a04f53cd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's likely a phishing or malware distribution lure. It functions as a link farm, containing numerous embedded URLs that point to compromised websites, many of which are WordPress installations utilizing vulnerable plugins for file uploads. The primary purpose appears to be directing users to download potentially malicious files, such as the 'auto chess mobile apk vietnam' mentioned in the document body.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8847

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 http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160741ee0d2299---4246421715.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3aef9f6b6---bewosigepafirabofim.pdf
    • http://kapelski.pl/userfiles/file/11061584903.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9d45c82a7---sonotadapibigizukidexezi.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e6b2cadae---wedowidawatusiwafitag.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/df9fsmi6ofb3n7j0lp7m973530/tixenijiba.pdf
    • https://stratasphere.online/userfiles/file/33956859763.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/e4576ff24752accaa6584dea91292439/30290564175.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607633bf283c6---jetizuzowoge.pdf
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/4ccf7203fbf632da6b9b2418019cb763/lilogokaponul.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/g38vpoj6vncuedh3pada1dp7d3/4318410892.pdf
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16092cda619bb3---mixoxajitufutuwolof.pdf
    • http://anvlaw.com/userfiles/file/74518469683.pdf
    • http://aucoindeshalles.fr/menu/file/55637399189.pdf
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/b9a80fe499cba384dd5dfaedc6ba3c67/bovopeziwoxuwofobapilojov.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076776f01fcd---50919757519.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4k3tmpariq8igrqvdecsdqbj56/86769512941.pdf
    • https://almondzwealth.com/administrator/imagetemp/file/pekosa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=auto+chess+mobile+apk+vietnam
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0fb.bin
50ac9a84820befcdf6d08832c26712b8a1eaf6474d00bc99891ef59f3261eabf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FB 3092 bytes
font_01_sfnt_off0000ebf5.bin
08a8a4e0d4646d05de7782d952a0d65c6938585f307e1451b0788bc55cf23f3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF5 5212 bytes

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