Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dd1aaaa42a47b8a…

MALICIOUS

PDF

88.5 KB Created: 2021-08-04 21:17:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 17b03ed63942002bab073654a634c9fe SHA-1: aef6d1ce597009ca5bc2f160899a27c5c05a3947 SHA-256: 4dd1aaaa42a47b8af95b74bdb76abe2208c1062197d3110f13a0296f097966d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or phishing campaign. The PDF structure and embedded URLs are consistent with attempts to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://pistant.ru/uplcv?utm_term=what+does+a+pine+tree+mean+in+the+bible PDF link annotation
    • http://cancercareresearch.com/userfiles/file/80360617413.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/2543001378.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/7898939305.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/3gu5vpc1hlelucdgtb3rncvijc/61269861809.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/mumabumubadapuzopat.pdfIn PDF document text
    • http://tencanpowder.com/d/files/61259895339.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/joledane.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3af8f1b443---52138848338.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160f7314186a92---46613802133.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b72858e1067---dazasufelis.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/19300976953.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/60805996272.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103287214fa7---lupepazefewumi.pdfIn PDF document text
    • http://dothi.info/images/files/96566018708.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/48821426349.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/20323084947.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608823a0e7606---31368915760.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/37208227985.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/aa8f1bdcbe6e2093371e60c07031e2b2/tazezesiwasojexegux.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/futopedemovabidudi.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/tnnhhg0oemscvbbfv83ph7turp/45225019010.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160909436accb7---13828721233.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/888edb0e24833ffc37d6dd0b7bf7b1e0/dinabugatat.pdfIn PDF document text
    • https://edarky.net/data/file/limajamozijuvapix.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_off0000f767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF767 10788 bytes
SHA-256: b3d45bf1f2077d1c0563a99e6a6c47d3e1526e1ea9eae60f07172598405cf461
font_01_sfnt_off00010fd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E2 16816 bytes
SHA-256: 15026c4f1c3701a033aa7ef15d78a30d8076dbb69839477792ab607db6156676

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