Malicious PDF — malware analysis report

Static analysis result for SHA-256 583921d4d2fbd127…

MALICIOUS

PDF

82.1 KB Created: 2021-09-19 10:53:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a1aaf1c2f48abc28210d0ac12c72a437 SHA-1: 6d6b9cf83c3fe00183c71cb6ce56f12bf47c42bc SHA-256: 583921d4d2fbd127ab5cf8646c012331daa55823d2ee516a90b3d2406a6c0e43
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://robertoantoniz.com/resources/original/file/xubofedaligegatata.pdf In PDF document text
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/mawevemitugawo.pdfIn PDF document text
    • https://flomogroup.com/upload/files/sotozinekajuse.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/161319a8fb981f---nukaxojuzopes.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/00917541e944ddf39fe090fac100e12b/84262311706.pdfIn PDF document text
    • https://www.ijmsir.com/ckfinder/userfiles/files/53237031510.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/jilanulaxubaguvus.pdfIn PDF document text
    • https://harley.dataroom.tw/upload/files/gasobefibaxex.pdfIn PDF document text
    • https://millvalley.com/wysiwygfiles/file/bakokawetap.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/sifijoguxotibeko.pdfIn PDF document text
    • http://lmtechsolution.com/userfiles/bewovasolitumi.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210903_FC4F233EA95AA709.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/6d2335418f933a072115cdd36035dbe1/feteda.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/bigulinej.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/lifazegugesumumebe.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/dubuzozukoxemagiseluw.pdfIn PDF document text
    • http://ziva-muzika.cz/files/file/potapatuvafewati.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/fajiludower.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/ff2c693503ee11ac5eefb1c8a31ac161/37272025581.pdfIn PDF document text
    • http://sineadstone.com/userfiles/file/xabujofusetilinubupegofim.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/sadiwisonapenoxaditumod.pdfIn PDF document text
    • http://regmac.net/userfiles/files/gememawiremiruje.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/jutux.pdfIn PDF document text
    • https://coffotea.com/uploads/files/202109111328429053.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+save+notes+as+pdf+on+macPDF 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_off0000d95c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95C 10688 bytes
SHA-256: 0c2ad76814aeb7da086192cac174fd8e3ca5e6aaf754eb4ae047174843a37288
font_01_sfnt_off0000f1e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FB 18864 bytes
SHA-256: 6ff72495dcfacfd5b4761f056c9f08e6f9d75044ee4571068a4948d23c6c371c

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