Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebd50e02340d5950…

MALICIOUS

PDF

84.4 KB Created: 2021-09-16 18:34:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 955980144ff4419dcc812b1b744833b9 SHA-1: 70a0eb291a841e4bcb1f39354cb0acc985ea073f SHA-256: ebd50e02340d5950fb8f3a2ae1da460ec7590e98e101aad7e2aeff8d3b44efb6
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF document is classified as malicious by ML models and ClamAV, and it exhibits characteristics of a phishing lure. The document explicitly requests sensitive recovery information, such as private keys or backup codes, which is a critical indicator of malicious intent. Several URLs extracted from the document point to potentially compromised CMS uploads and link farms, suggesting an attempt to distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://studioingegneramato.com/userfiles/files/60718599966.pdf In PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/funubipujugojunas.pdfIn PDF document text
    • http://mrpokedb.com/uploads/files/33820854898.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/25716004148.pdfIn PDF document text
    • http://nuocmambason.com/upload/fckimagesfile/4959288d570615d79cc0c5df8e90cd72.pdfIn PDF document text
    • https://mokshadhamnepal.org/userfiles/files/vakes.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210901231954.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/3c4ab1d0ba5b0023f20244b6a5947b52/kidatenubewuzox.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1613dde988d2d7---22428087945.pdfIn PDF document text
    • http://biomehl.com/images/content/files/3705487195.pdfIn PDF document text
    • https://isosklo.cz/uploads/vegorono.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/24331523735.pdfIn PDF document text
    • https://istanajp.com/contents/files/38430653656.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/56193603767.pdfPDF link annotation
    • http://support-cmu.com/filedata/file/18472065829.pdfIn PDF document text
    • http://ibshospitals.com/userfiles/file/40664184711.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/g0rluppvncdc84dp61j0qr3feh/10648023305.pdfIn PDF document text
    • https://longhoang.vn/upload/files/zotome.pdfIn PDF document text
    • http://ricettebiagi.it/uploads/assets/file/bugasasufazefo.pdfIn PDF document text
    • http://pkpneu.cz/userfiles/file/samowilabakavefumub.pdfIn PDF document text
    • https://infotechsystemsonline.com/ital/www/img/file/virajotanilupedulubur.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161309d7457f62---92297586239.pdfIn PDF document text
    • http://nova-auto.com/upload/mikixubetanimo.pdfIn PDF document text
    • http://mywymc.com/userfiles/file/xujuluridijipuje.pdfIn PDF document text
    • https://doosradashak.in/ci/userfiles/files/37896940490.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613803c82c8e4---bukokugafifogisonefix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=run+gradle+task+android+studioPDF 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_off0000e600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE600 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE17 10660 bytes
SHA-256: 88af409c6e6a543d63279f11ed98000ba92b1492553990ddd01fa8b82a11b64e
font_02_sfnt_off0001166c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1166C 17444 bytes
SHA-256: 674969809885ab768d73275a7dc26bd4a066df98fb89b7ea8696baaa4f540a56

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