Malicious PDF — malware analysis report

Static analysis result for SHA-256 db3fb3d19f5c01b1…

MALICIOUS

PDF

102.1 KB Created: 2021-07-14 04:12:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: deadfdc64fde52ece5d80ea553f02b87 SHA-1: 069fd00a18e48649080ca6d4b89b8ddbab2e9875 SHA-256: db3fb3d19f5c01b17ce778a9f38aa5dcd8cb7ced1a6ce15b398d54a2f22d77e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://huntic.ru/uplcv?utm_term=the+carbon+that+plants+need+for+photosynthesis+comes+from PDF link annotation
    • http://didula.com/img/file/julovegukogirerosevam.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/o7i8091s4ipm4c0dk0s2ikbkvl/22391717783.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/tjg5ipjpjvqead8k0mjca8115e/sijagoxakanewunijetuz.pdfIn PDF document text
    • https://bkht.vn/userfiles/file/fuguv.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/3942695894.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8270a9eb20---benugoridamut.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/15912053732.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/bnk90n5ccukvfn98vt9t484hok/kaforiselanudatopina.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/51a998c72019d0adfaf03c8e5300cb16/bikowojo.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/xivilofuz.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160de28ce437ef---tidajivekidaf.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf87c83ac67---68799760208.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb3ee69594---vademikovufibilidosesid.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ea27d52bb83fd3dfa53ce84e6ac31a55/kexigo.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/tezifiporipinuwosudasixun.pdfIn PDF document text
    • http://df-foundry.net/d/files/78703886402.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/9452438360.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/zofuwifugeropufuxewo.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608879891fa64---15766269846.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/lu6odl3lokm14lua1e4jojjoj0/liwevapatilawixumud.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_off00012bf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14407 17596 bytes
SHA-256: ef72c194c3c66c9e87e66c0af587bd3329752fc8f37460718d3f9850d7e8e590
font_02_sfnt_off00017151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17151 11104 bytes
SHA-256: 5a9a8ba7e31c3580b870095ed5c86148e900424b0e6d705158bac2f934a51bd9

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