Malicious PDF — malware analysis report

Static analysis result for SHA-256 71419506d1e790cc…

MALICIOUS

PDF

55.7 KB Created: 2021-06-11 05:11:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7b58eaf2b2e673a0e966e3211922d17b SHA-1: 78f062288501251f1d69119c734848fb46985bc5 SHA-256: 71419506d1e790cc085a78fa0dc47ee0acba96209def65d5556489c55f2dccab
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan distribution attempt. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to 'adjectives as nouns exercises pdf', likely to trick users into clicking the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6956

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 https://cructi.ru/uplcv?utm_term=adjectives+as+nouns+exercises+pdf
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/75fa30745a5154f4c7bb3fc86ec60d74/bopejusesusev.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe7bd6126b---71685190791.pdf
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/39827268316.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/752ce197435b73dea620b8c329f1eb58/53607699179.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3c7267b32---86412415665.pdf
    • https://jagominum.com/contents//files/55012315693.pdf
    • https://hirurgija.me//files/pafimotatinikitoju.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7f592bd8a---mupewebumakope.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a43cde9e3---fusofojoriwopuwujomowog.pdf
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/68c1e973c4e38f7148e6e52d8dbe56fd/katusumaxe.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086267495b45---82510065633.pdf
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/xejojagora.pdf
    • https://tecnicadovolante.com/images/file/xaxejevutezer.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1609deabc0b0c0---rapibizezabo.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607e51fb0fe27---besugivopelipovolunawixuk.pdf

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