Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a432c7c0e8d20dd…

MALICIOUS

PDF

64.0 KB Created: 2021-06-03 03:08:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f60fd4f841286fcd255926f2066523c5 SHA-1: e6bc9b814c1bc75ecfa6d8db7d329b532089c718 SHA-256: 8a432c7c0e8d20dd06271a1b15c621a5792981d0ca15189ad64d643fc2b41fe4
154 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The embedded URL and the nature of the links point towards an attempt to trick users into downloading further malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8602

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.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a75eb1b62f---36250253328.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa04503b00e---tafifusojax.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608be37b71f59---42104900107.pdf
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/918d8f11f4708abae42708b12d8e6a49/41250416972.pdf
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d30db886e3---zanevufotejakapitukitol.pdf
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a81241a662b---tebogevud.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/2oh3rplqj1c9le5c69ugdb9utj/50641805441.pdf
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/59427557185.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/i19h1evjdeam70lgf4da28ta6j/pedaxonazunofiguwo.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/59f3fb3b315624e5475905ed6b7270bf/gelemumufeburolax.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c991f118a3---59884660560.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c322dee41c---dejabidumo.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3fc646b91---joxotisogukipopufajaxabi.pdf
    • http://bodymindspiritconnection.org/clients/5/53/53f1eac0d8ee32431a47b4e1af774f29/File/20878623989.pdf
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca613e945e---63714020519.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/58c7bd4b5db5d9e733971bd7771f3b16/84769117482.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/hattjgtfk1k1tras5t51bimfnq/1956556584.pdf
    • http://lorichphoto.com/pictures/file/67919133642.pdf
    • http://autosoftware.company/autoresponders_images/files/62510774112.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=watch+online+sherlock+holmes+season+1+episode+1
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d324.bin
cfd18f115d45765de679f4442c79957431536990d8042e2ac0f08ad0530825cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD324 5228 bytes

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