Malicious PDF — malware analysis report

Static analysis result for SHA-256 a215acf82a26da55…

MALICIOUS

PDF

69.9 KB Created: 2021-06-03 22:28:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2244dc7a2dc8ac93dfb9d69dedd326bd SHA-1: c65d17bdcd8cefebae95a1fe91005183b0b9cf31 SHA-256: a215acf82a26da550821ba2a882edf3590acd8c5b25f0546c026f7942e8956cf
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, indicating it is designed to redirect users to malicious content. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The presence of a link farm on disposable hosting further supports its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8846

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://ldbell1965.net/clients/85689/File/75426258368.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ea6edd5b2b---rapunoxokuweterem.pdf
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/7d2355083de5418bb465ad98b5f3dfa7/45831628070.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/8f4655f3c2380a8dd11c2486e1aae59a/57734598859.pdf
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/57cte8m1aqgfmuciouo2tf6620/66058077683.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe3c85528b---jogonatax.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a1b43bbe4---99259715339.pdf
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/669616a0b8bb6faaf9304d4581f6b243/57000162116.pdf
    • http://anhbanglaw.com/userfiles/file/kuvufavokuvixisefogonoju.pdf
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784c3d4dcca---kavuvuk.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089b1d866626---moxomufovukajexiv.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823c8b8f489---zogoxekisafupisorimekizas.pdf
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/180ad25df1dc8ba34aa3f4d70044b107/bivubifukamugapa.pdf
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078ef3e25806---68180854423.pdf
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/5a902090458a587b3fd46baa06f756f3/wudezafakunazorijor.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b398d97e930---66762191563.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+often+to+wash+mattress+protectors
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e601.bin
a23b77df18a1c6750837f8d309f326a54aa5c4741a861c75b21c99b1c62e8458		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE601 5276 bytes
font_01_sfnt_off0000f7da.bin
645a9e930f19d50956110ab35edd593645380f6e16c17f64005e255de76f68c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DA 11288 bytes

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