Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f94e5e48e98cd5a…

MALICIOUS

PDF

78.2 KB Created: 2021-06-23 11:01:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: da8129dd5a24f9c4c30abc8d92dd6b38 SHA-1: 577e3b5b2e00118734f4c9248f9889657998587b SHA-256: 0f94e5e48e98cd5a9e16a43743992be9286715bf8846e100f3081691f42e2b3b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. The presence of a URL promising Windows 10 Pro serial keys indicates a lure for phishing or malware distribution. ClamAV detected this file as Pdf.Phishing.Trojan, further supporting its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 https://infrive.ru/uplcv?utm_term=windows+10+pro+serial+key+2021 PDF link annotation
    • http://sola-brothers.com/userfiles/file/vigatelipax.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/71e3dec971367d378137715f9f0f3d50/xekulibuviririj.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c69580456---robemosetejovelofimen.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/53a17bea9ffd95c94bdf797a6733868a/jujavawewa.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/76681318363.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/tupelanegegeta.pdfIn PDF document text
    • https://naoshima-habitant.com/lakuluwowodafofap.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609a64c501aef---vunefuvok.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/fudukupusagelakopodizize.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b6728cc1e---23245855243.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/39358895666.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/jugonegugezafafu.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/829477f910c29c8b381934098b909186/tazijusasavirumasefulis.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/welozu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DD 5552 bytes
SHA-256: f5d2219740bca5d17411e2f97fa08aa73da7483ff238215ab240dfc7f5424fc0
font_01_sfnt_off000103f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F5 12048 bytes
SHA-256: 5c4f8d1bd83abe98782bcd8160a859caf09d647479733eb12e62d5de1013e7fe

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