Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5726e0cf1fd8650…

MALICIOUS

PDF

73.7 KB Created: 2021-09-23 16:10:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 21802c40560b8134bb659dd94d7cbdf9 SHA-1: 8453187961748ff11869c171f1292e4412cbca0c SHA-256: d5726e0cf1fd8650855f9f82fe3353e3989fb13e50a4deccf9fad13790038964
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. It also features a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to obscure the ultimate destination and evade detection. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing lure or a downloader for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7568

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nomylo.ru/uplcv?utm_term=the+amazing+spider+man+full+movie+download+free PDF link annotation
    • http://vektor-bezpeki.com/userfiles/files/94697234988.pdfIn PDF document text
    • https://canoe.ro/Extras/ckfinder/userfiles/files/50993049462.pdfIn PDF document text
    • https://ppntassone.it/dati/upload/file/jikijimodozeri.pdfIn PDF document text
    • http://xingyeknitting.com/userfiles/files/82596435170.pdfIn PDF document text
    • http://juentai.com/userfiles/files/tebeboboresojad.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/petanokixorusemobu.pdfIn PDF document text
    • http://tythb.cn/uploadfile/files/68594069499.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/luvalirotawedozegof.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/jepisadelakonebidakug.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/42635210107.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614411dcdd2a0---77670114150.pdfIn PDF document text
    • http://microsolder.hu/userfiles/files/tidopi.pdfIn PDF document text
    • http://ladispensadicampagna.it/uploads/assets/file/73148310135.pdfIn PDF document text
    • https://www.netcorp.hu/data/editorfile/57031592152.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b7d0ad984f---63687476678.pdfIn PDF document text
    • http://stylowa-pss.pl/userfiles/file/91486634634.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613812fe4258f---vadazapewunewizijitavaku.pdfPDF link annotation
    • http://vom-ragnaroek.de/uploads/file/47939134422.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/44808938159.pdfIn PDF document text
    • https://factorysales.com/userfiles/files/vazilamadilewifagazar.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144334eaa2ee---15682816540.pdfIn PDF document text
    • http://shmgec.com/Uploadfiles/files/vajubokaroxotewifero.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/21639605817.pdfIn PDF document text
    • http://m-styleauto.com/js/upload/files/tasabar.pdfIn PDF document text
    • 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_off0000e369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE369 18956 bytes
SHA-256: 8e0500534e1faa9ede7aa91dfcd2678fa1ff9a9efe77ef08c6f7a6e6a0bc8e0e

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