Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8a609eddbdf451d…

MALICIOUS

PDF

70.7 KB Created: 2021-08-10 12:28:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6cf5c989845cde1e262b2995e247e71d SHA-1: 08a47b9d0951d8a2cce68119a825fdadaa8389f5 SHA-256: d8a609eddbdf451d0a1730f61b9338254195bcedc2a0ade8a1ea37fc5bf51dd7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of external links and the heuristic firings point towards a T1566.001 (Spearphishing Attachment) initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7446

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://rockhousemethod.com/ckfinder/userfiles/files/bisobuwubatizunaj.pdf In PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/df8hdvmoqtfs7alnm6pa07v56v/65502665693.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/tatilusegoze.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160993608a91ff---kasebumagufaxorodenuf.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/41817f72c75a9b823ac226aeca0f10b7/32506930929.pdfIn PDF document text
    • http://www.alborada.es/ckfinder/userfiles/files/93873315864.pdfIn PDF document text
    • http://patp1ryb.ru/media/file/66095742424.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b212af5b43b---melutufogutifa.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/rubusegasazobasixe.pdfIn PDF document text
    • http://consade.com/userfiles/file/xuvel.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/73888010852.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/4945ebfccd4a09619a35c56c351e773b/labilovivuteroxojun.pdfIn PDF document text
    • https://pacie.vn/web/uploads/files/62569256872.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/08aul25aef2ahmiiimhk9unhbm/65711121188.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1625068285.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b77ce019d4e---zosaxelamowetidu.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610a0621cd775---77286696099.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/xejigipajokat.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/5030caa0ff0ec7942e2acee064a73f9f/55482523600.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085a8103c693---silisomatofifajepuzised.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/dosemevevefunigupona.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/pobamatamogutimoxag.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1aced0bfe---29664371304.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/6a58040f1e3aea3e479fd48e711d2a08/88429342630.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=what+should+a+cover+letter+for+a+cv+includePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF46 17248 bytes
SHA-256: 09c7af5732aeac4feb64060aa024a3317ddd4cb9eaf9e06b4b24a5f986e3fffa

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