Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1e1ed2a4cbef479…

MALICIOUS

PDF

89.0 KB Created: 2021-07-17 11:31:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4bdb361656cee73865fc1b17d91be4e3 SHA-1: cf3f8531a6c56b9bc01a86739fd47b1aa53222d8 SHA-256: f1e1ed2a4cbef4791e5781f8760237512d4b0c3d883288d04d869ccb88310454
156 Risk Score

Malware Insights

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

The sample was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to external websites, many of which are hosted on domains associated with compromised CMS uploads or appear to be disposable. This structure strongly suggests a link farm designed to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://thebankcardservices.com/uploads/files/kuberamudifuzezede.pdf In PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/jixanumiponisiwu.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/kogesabugeborol.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/78997563623.pdfIn PDF document text
    • http://bazis-expertiza.ru/ckfinder/core/connector/php/files/25718574163.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/op7dhum4bm2ukuth39avkrso25/96465551018.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ae42b1141dd---gesizuji.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b44bc5ccb---23010195944.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/26a9412a8413ed2c6f8ec7d92a15bb5a/51387924676.pdfIn PDF document text
    • https://666666.vn/upload/fck/file/74645439487.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/20855174867.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/61ae5a6931ea324f9751b6dae1009051/sejabaxugejilodimoxud.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/fevovov.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/d9d9b968de5c72172b99414fc5c30dc3/14626338572.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/ll8t6slbah1g58jdtp4gu31jgo/wodobuv.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/10330051677.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/90190363417.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/uc8voq5funsf67kpdql47laeo6/maridevedibu.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/foxakik.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/c064cc0c783aec2b2ab5a972e85962d0/gatuwasafa.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/vuxukupudizugivoji.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5e171b466e---guburopigitimuxozetala.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=the+definition+of+condonePDF 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_off0000fa5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5D 10060 bytes
SHA-256: 5ec17f8f228a620b34067816e5c8a15967779470fbdaede8d987522f618f451e
font_01_sfnt_off000110a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A6 17752 bytes
SHA-256: 1660e559a822855bd037b78b10aa315136ecc085102c7edeeca7588da4df801f
font_02_sfnt_off00013f28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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