Malicious PDF — malware analysis report

Static analysis result for SHA-256 e73d3784c2705993…

MALICIOUS

PDF

82.5 KB Created: 2021-09-17 06:13:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c82f45ab7a28b4217976da6d9f7642c5 SHA-1: 31398252db3f4f69a7e10d5581f0f95f41f3b0ff SHA-256: e73d3784c27059930e3048045771565aec29eb05d5e14d2ac0e43bc686ed5a34
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised websites, suggesting a link farm designed to redirect users to malicious content. The presence of a 'cv send for job' UTM parameter in one URL indicates a lure related to job applications or CVs. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://archism.ru/uplcv?utm_term=cv+send+for+job PDF link annotation
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/4839a3b3c05a93d40e2b1afcda557923/kajiziveriwenuxolakefaxe.pdfIn PDF document text
    • http://energy-labels.nl/userfiles/file/32550101361.pdfIn PDF document text
    • http://vakaruinzinerija.lt/userfiles/file/tikal.pdfIn PDF document text
    • http://perksys.com/userfiles/file/vinorul.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8bd817527---71305636849.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/demuxevojidigidevukebikuv.pdfIn PDF document text
    • http://bernendorf.ru/userfiles/file/tajezatu.pdfIn PDF document text
    • http://satcomlink.com/userData/board/file/sudofuboxut.pdfIn PDF document text
    • http://dorisemitchell.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10248336615.pdfIn PDF document text
    • https://cargoservice.pl/cargoservice/userfiles/file/78504354516.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/18b957c4694fab9618ca480b0a35f0ae/86719082453.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/kedub.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/15498131003.pdfIn PDF document text
    • https://cncunse.com/d/files/xawujoluvokudevow.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371c1e6cbdb---88040973110.pdfIn PDF document text
    • http://beverly.kopanramen.com/uploads/files/94567472811.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/19c43005d13ba5655c43d1a1ea75fa7a.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161367349b7c2e---bukukerefiva.pdfIn PDF document text
    • https://studybrilliant.online/app/webroot/img/userfiles/file/9555636047.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/41522495709.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/42tutab0kji8lvhpuetb49civb/32389648592.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/jolarugikegolifap.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/77919598195.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/badukonoxidivimegijas.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_off0000dd08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f51f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51F 10316 bytes
SHA-256: 9cb73fa4c9708d8794560e05a1520066fd1e3bd8e79c43da4a25832f3fb530da
font_02_sfnt_off00010c88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C88 18756 bytes
SHA-256: 282d21159d4bc59a41df21207350cfa84c360cf710dc4094505dc8e2053b6d8d

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