Malicious PDF — malware analysis report

Static analysis result for SHA-256 a25014c38963bbde…

MALICIOUS

PDF

77.9 KB Created: 2021-07-19 14:38:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 71b7f5fb4253c7c5519237d58ba35c91 SHA-1: dfb44acc318b409ea071cd53448e9c95738c138f SHA-256: a25014c38963bbde613206b277a612bd97854f8b31e349df545922ca0b76711b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the PDF being a link farm hosted on compromised CMS upload storage, suggesting it's designed to redirect users to malicious content. The presence of multiple unknown URLs further supports this, as they likely host the actual malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7d94d545c8---gudivijewirejerutivo.pdf In PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/8de1533f3213bd1cf9dadfb64b45ccd9/13348401997.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16071be32f1247---zawowononejefagixeritanek.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/7168208460.pdfIn PDF document text
    • http://iweldbot.com/ckfinder/pho/files/lubapujovemonulokagis.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/33934945527.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/powutupijozab.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/tasolo.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/veteg.pdfIn PDF document text
    • http://pagyesa.org/userfiles/file/20210629180933.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/435e02cedcbb955ebb4e61e4fce399da/23839033259.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/977ff948293525be659273247330a2d7/16526275691.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/59930726938.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609a148483567---gidozegeneroxekudot.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/78898892657.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/pobigezafujunurukuxozi.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3abfd500f---lilodedubaxepujogixotoga.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/83319182325.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/i98ksd0k9cj991s47clmb8vk56/96961117468.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/14265150b31502f4a1cb641db442ed4b/95507699066.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/4b1902651289d8d63ed78441a72f4a2f/83514876583.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/cvlm8rlu00kep90pibvjjsfnhj/71230098517.pdfIn PDF document text
    • http://446888.top/userfiles/file/36916872344.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=crp+32+meansPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF75 10380 bytes
SHA-256: 6f8a282974ce3f08fe769a537bdb654f262b0177c9804d3d3c0a95a686eee2b8
font_01_sfnt_off0000e6f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF05 16820 bytes
SHA-256: ec623455d359507caf380f6f0757e4f39a8f5b59aba5549e36cf872847bc44b4

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