Malicious PDF — malware analysis report

Static analysis result for SHA-256 8554619f8bd3c096…

MALICIOUS

PDF

70.4 KB Created: 2021-09-24 13:22:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f7ac34a13946d205b00ea568b5b32d9f SHA-1: 3895fbc1b7fca981ba15d3889f45807091b85616 SHA-256: 8554619f8bd3c09682a4f8ee134aa63eeaac9f53478afe9023a3c8a7d52aaece
96 Risk Score

Malware Insights

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

This PDF file was identified as malicious by an ML classifier. It functions as a link farm, containing numerous embedded URLs that direct users to external websites. Several of these URLs point to compromised CMS upload storage, indicating a potential distribution point for further malicious content or phishing attempts. The document's structure and the nature of the linked sites suggest a tactic to lure users to potentially harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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://fuoriscena.eu/file/dobopuj.pdf In PDF document text
    • http://wideanglepackaging.com/ckfinder/userfiles/files/95674387267.pdfIn PDF document text
    • http://eichler-kammerer.de/70278597761.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141bbdcdd498---12313788574.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/dadotudemele.pdfIn PDF document text
    • https://www.tahitotfaluovodak.hu/ckfinder/userfiles/files/xefedobepetapotu.pdfIn PDF document text
    • http://byecook.com/ckupload/files/73354508271.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/bb213ca9f57069a61ea92528a17c9ed8/salisegifuzaxud.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/9384450dbe6726b34a88f67393fa34e9/62058573017.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/11053376442.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/9b07b7444432e8fa6e4e327bc152ac10/wekolabewajara.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/812839e35caa6b7807ea5db84f0ed739/revowufawej.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/38939429072.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/zunusewakimafovebiwenupo.pdfIn PDF document text
    • http://888chji.com/userfiles/files/8462076109.pdfIn PDF document text
    • http://wawa757.com/uploads/files/zezawun.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/dubikevolo.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/kinesopi.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/tibukovif.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/27108352169.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/wirored.pdfIn PDF document text
    • https://winstar-tools.com/UserFiles/editor/file/57027798853.pdfIn PDF document text
    • http://www.mattig-accounting.bg/fisiere/file/kawabuvokaxalapaf.pdfIn PDF document text
    • http://karthikeyanjayaram.in/userfiles/file/59646439508.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=my+hero+academia+season+5+episode+12+english+subPDF 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_off0000b323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB323 14272 bytes
SHA-256: a13b4144ce34645ebfee2c43bd733da78ac23b9bbbb3d0fecdc0ec3e89dfaf63
font_01_sfnt_off0000d6e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eefa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFA 11516 bytes
SHA-256: 7d2af9c25a4ff1ec285d110ef6b3587532be74a0bcc125bbd3ed9778b40541ef

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