Malicious PDF — malware analysis report

Static analysis result for SHA-256 9728665d692380aa…

MALICIOUS

PDF

89.0 KB Created: 2021-08-25 11:18:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7701febddc5dd7421d50c88b749fae10 SHA-1: 7140489dae6572f3efadf6a2b90179eb9fd7bc07 SHA-256: 9728665d692380aa37ede9e8398bebfe9319d3a5db025bd35679190ef65aa0b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting. The 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics indicate a high likelihood of malicious intent, specifically identified as phishing or a trojan. The embedded URLs suggest the document is part of a phishing campaign or a distribution vector for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://nomylo.ru/uplcv?utm_term=interview+questions+on+unit+testing PDF link annotation
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/bbd4168a8c1e11052bc2e97849bdb0c1/58196947056.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d24b00edde3---zagadiwevazuwewaroji.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/mokeve.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/fugar.pdfIn PDF document text
    • http://firanywiktoria.pl/uploads/editor/file/bixitaviduvozogolope.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5b3edb2065---58457417325.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///nitanisuvivogokogowujob.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/60526443840.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9c8929275---vawifuwokosimegolalor.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202108140308435262.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9a1b239dc---47656304089.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160793813ad6aa---mudukufado.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/utf22f2lhdkqso4jigthmrghj6/derefezu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110fb558b458---fekamajigarod.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/sujumusomexibafetokemeru.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/718d016bc39183a5e3217d49443a6c00/45011216016.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606de63cb9e1a---52093225213.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/76459962590.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/62796390295.pdfIn PDF document text
    • https://gujaratisamajparis.org/upload/files/topubikaxapesalunoxev.pdfIn PDF document text
    • https://suksesunited.com/contents//files/11123234882.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/80700682065.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_off0000f85a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11071 10424 bytes
SHA-256: 81377eb6dcd550ea1e9e6e2dffe854a85bf3107f2ca8143668423024cdde8607
font_02_sfnt_off000127f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127F4 17516 bytes
SHA-256: 7efc5e3becad0f34c0ea3c13c339260bcd38f8bec39ee93f3ce8de259a25f6f9

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