Malicious PDF — malware analysis report

Static analysis result for SHA-256 f11f2b5f6dd300e5…

MALICIOUS

PDF

89.9 KB Created: 2021-07-13 07:11:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fd6ea8f268279592b7d1ab321e4a55cb SHA-1: 31dd05f5801054f9ff40ed86a59f57bc60a09ff3 SHA-256: f11f2b5f6dd300e518ee21e7d067a13de8b23a65485933e7a2847e3f61df80ae
156 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 high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and disposable hosting domains. The embedded URLs suggest an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • 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
  • 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 https://drafthe.ru/uplcv?utm_term=both+right+and+left+brain+dominant PDF link annotation
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/t4jbq16c6ggismtf23esvo5dgb/sifutogibuvefofuku.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160927f3b76406---57767702534.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609854a3190ca---33691652713.pdfIn PDF document text
    • https://yuss.it/file/93466576740.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-1/20210501001055382120.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/61861142513.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a08fdba56---melijazisavamabikujubose.pdfIn PDF document text
    • http://allasclub.com/campannas/file/bokadarozezumurixewidaga.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/e29358d9404042c49b3569dc7ed8fe69/kigibizokamoroxipijix.pdfIn PDF document text
    • http://optikametuje.cz/userfiles/file/39004816633.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe3e7361e8---jumazoketavigefojumewuga.pdfIn PDF document text
    • https://nepalimodelagency.com/userfiles/file/77350690249.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/75255098504.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/56698379362.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a3461e2863d---59623705171.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/12631463732.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0e4405396---87284509162.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ecc1603dcfe---4688108826.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/sikololiji.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/slgjiu2bhtmrpr3ik8jlbo0fng/begagoruzeboxojusixi.pdfIn PDF document text
    • https://denimder.org/resimler/files/56620835227.pdfIn PDF document text
    • 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_off0000fd91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD91 17252 bytes
SHA-256: 79907fec4041f7edfb9c8b0b52637f1f5b86feeedcfeb2d47d8fb0ad94527cb2
font_01_sfnt_off000129ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14216 10824 bytes
SHA-256: 2ccadacf589a38d328d8b5bb180fc6f9d0045d3436d975e28ac536ad75631361

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