Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e3935c9c5332664…

MALICIOUS

PDF

64.0 KB Created: 2021-05-07 17:14:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8f71bf4d670ab8660f5be81012c9824e SHA-1: ab7d23213a6a844b306a859655eb0fdc3db86f6f SHA-256: 3e3935c9c5332664e6170bff7350c37719c0cec97a2838f7fb6e7ad59d79fc36
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a phishing or malware distribution campaign. The document body, though heavily obfuscated, contains text related to 'acca bpp f9 study text free', indicating a lure to attract users to click on the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7711

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://allytemp.ru/uplcv?utm_term=acca+bpp+f9+study+text+free
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad13ca7d52---6706030197.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ba2dc0d15---33441804755.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/07f2998e548d242c0d72e622690347d4/zejosox.pdf
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/fs1uip1a1649mk2behv4kl5l61/vukixanukosa.pdf
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/6f0e7d55e6737ed54ec9963662e4b8cd/86026481520.pdf
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/f9ggn4om1flirh971egspeotlp/43849672549.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/cm52tdt9bm1p01nm9llgghfu05/bebemanasobasutumunemif.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/jraf8g0j4nfvdn1ctdkcbhdh41/puxirozefudewulalage.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/22nucqp4uaehqjt2nessual0k8/teveju.pdf
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/ff98e67382960fa1cec81993a9378b6d/daburubokadexuxaxuro.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/shtr2c75uo69b26ctcshr5iiar/48376115846.pdf
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607be7a497c8d---55695374996.pdf
    • https://www.leeja.co.uk/wp-content/plugins/super-forms/uploads/php/files/f27e21cdf3afa0b62a5a30b0fbbdf247/41522263356.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb917397da---94192322899.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c7c7.bin
837bd8e8ee9f31a377830ead1a5362ce36bc06bd89b266846b58ddd9bdf18ef4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C7 5572 bytes
font_01_sfnt_off0000dacc.bin
a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDACC 1800 bytes

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