Malicious PDF — malware analysis report

Static analysis result for SHA-256 2590158d3698d2a7…

MALICIOUS

PDF

96.0 KB Created: 2021-09-02 09:18:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7a8018dd6f90f54369ee31ab1fc06bc2 SHA-1: 4bf9812e0eabe024217567306d5b46a558624a72 SHA-256: 2590158d3698d2a74e7a386cd4b0a8aea1ec1c2d992ebc5301679e9a79e0d378
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. The ML classifier also strongly indicated maliciousness. The primary attack pattern appears to be directing users to external malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://seoulmenu.com/uploads/files/19354602480.pdf In PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/9a383ac3c39b568c251613a40cccdc87/bopavuxenumidomofotupuk.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/7ded49b245ab99108cfe7bf6ff63f2e8/dodesitoboxaxapejaxu.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e26b0b09b---madiva.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/91962170677.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/55327324954.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16078c95e9e97a---20336687531.pdfIn PDF document text
    • https://pacie.vn/web/uploads/files/20150634657.pdfIn PDF document text
    • http://ultrabeauty-ff.ru/userfiles/file/13717249659.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/11722471786.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/ao0u7gdq487oqur2e6m9une4u4/97516251334.pdfIn PDF document text
    • https://micsys.in/userfiles/file/buxugewub.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/oqtraq4nfd3ovvqrttrm1386au/maxozerawuf.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/b292c424e35f370a9f38ec4a508d0ab6/witedefovedebixo.pdfIn PDF document text
    • http://starcity-vinhomes.vn/app/webroot/img/files/26964010696.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lodaxijive.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/1c23dc8cddf0c8753195d40452866286/saxonesivif.pdfIn PDF document text
    • https://performanshost.com/calisma2/files/uploads/10538169923.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160944b8b698cc---82876854050.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/84863979632.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/35431424935.pdfIn PDF document text
    • http://mamnonkitty.com/webroot/img/posts/files/59827544443.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/88d16f98162ff03908769d2ee8b9746f/wufiwolutex.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/vazajekelebuxejan.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/dujalimexav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=race+2+full+movie+online+playPDF 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_off00011264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11264 10720 bytes
SHA-256: 9901421bd4336affe2ea5f207b12a39e79141a2c077b05312da99a76ab113038
font_01_sfnt_off00012b14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B14 17840 bytes
SHA-256: 339256171643826d88a575771b898c4cc72e5c4ea2a75c01fafb657105d25cc5
font_02_sfnt_off00015907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15907 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1