Malicious PDF — malware analysis report

Static analysis result for SHA-256 15f4d6b90770ac1d…

MALICIOUS

PDF

90.2 KB Created: 2021-09-06 04:28:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4ab2d5d4637b55b6515a400cabd909a9 SHA-1: 1784fab45c5481ac8253c83dd0b42b40ed2f52a5 SHA-256: 15f4d6b90770ac1d2f86b2d27ac0ddc72e95fab262cc93e1d8275d8081aadb34
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The heuristic firings related to link farms and compromised CMS uploads further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://archism.ru/uplcv?utm_term=criminalistica+definicion+pdf PDF link annotation
    • http://hysansam.com/fckeditor/userfiles/image/28941394595.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/46346501896.pdfIn PDF document text
    • http://beergolfers.com./blog/images/file/78683725038.pdfIn PDF document text
    • https://europartner2.pl/uploads/nisaxexozexewivareludawiw.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com//ckfinder/userfiles/files/kadadexise.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b61e7badf92---15375509984.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/bobegesokejovov.pdfIn PDF document text
    • http://cycling-software.com/files/file/13357032214.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16098bbe0857e7---86555938387.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/aht60beu5n14uqc7lubsr8bo16/tebowuvedina.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/dafilene.pdfIn PDF document text
    • https://juraganmonyet.com/contents//files/18992967798.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/46023078457.pdfIn PDF document text
    • http://sbairs.com/datas/files/wejovudawored.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/95989097603.pdfIn PDF document text
    • http://fabtur.ru/upload/files/zawubivamig.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/95jim0iud5sieqcn1j6905ffg3/26353712461.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/88209279065.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/758ef72b65069e45dd574590a2e849ea/22100722998.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/c9ab5dcfbe19989a6dcaa45283f0a10f/3321338597.pdfIn PDF document text
    • http://lowdertraviscoats.com/clients/7/74/74ec8bd2877f4db8d0b9f56bae0111c3/File/salokikubovubizuzu.pdfIn PDF document text
    • http://lordbeaverbrook1973.com/clients/76835/File/wotivopogujuzemuwejedi.pdfIn PDF document text
    • http://119pump.net/d/files/31994989433.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/58522713347.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_off0000f6af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AF 19536 bytes
SHA-256: 01f3f54abe5637c78288bd7b8996b3e2d63e9d8a42218c9847630bb5ed66221c
font_01_sfnt_off000129e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E0 10812 bytes
SHA-256: 98825bd6d999f06ea4da958732992790867b59467620b03ea337c3e5bd07217d
font_02_sfnt_off000142cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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