Malicious PDF — malware analysis report

Static analysis result for SHA-256 c867322eef6977d6…

MALICIOUS

PDF

88.2 KB Created: 2021-08-11 10:56:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e4e562e3154d13475a6b854af51cf8d2 SHA-1: b5a7ee17e0ea16e7265bdea5fa8f585c46b019cc SHA-256: c867322eef6977d6dd0359b12e21d8f9a107b1ef864c3e3f1d2465b0ce23b6eb
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that exhibits characteristics of a link farm, with numerous embedded URLs pointing to various domains, many of which are hosted on compromised CMS uploads. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://a2designbg.com/userfiles/file/68559488048.pdf In PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/b7088f7cdc8e4ef2034e2c2b104e4990/toseno.pdfIn PDF document text
    • http://rehahomecare.com/upload/editor/files/38483483251.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/zedagojafuminogaki.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/60742378372.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/k98sp5285dpoo984ot6eqeckr0/10778318357.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/40655501895.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a5efb2e8ae5---97648089871.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/73680169729.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7e8853bf73---28044863076.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/24635699751.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/65376939324.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/wagal.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/puromifuxobuva.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/aru8fpdvis43g8moln40i8u1e9/11798241791.pdfIn PDF document text
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/18305038561.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/417c7bebb297dfe649623aff93229665/sajawi.pdfIn PDF document text
    • http://prestizhstroycompany.ru/SITE/files/editor/file/11023348937.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/u4rbg9e64kfjjbcmt5m8anin04/zoruvabiwinemutabovupurov.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc25946260f---mavar.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d0142fe1b---wojuvesugosurepowibok.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8c59b6c0b---refam.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/41225891562.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=appcake+no+jailbreak+ios+9PDF 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_off0000f54e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54E 10780 bytes
SHA-256: 88be3dd83caae780733e149e2ee865addee3a8fadd517320fb27d0e038ef400f
font_01_sfnt_off00010e05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12617 17008 bytes
SHA-256: 61006715859d3c8c3f83f2b6a82535a5536c19b0c8f4b21ce21538332bda36d8

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