Malicious PDF — malware analysis report

Static analysis result for SHA-256 28e633c19357ceee…

MALICIOUS

PDF

90.8 KB Created: 2021-07-30 10:01:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 15bb202078b6b958e535bfad5f9f3a39 SHA-1: 458be76c6304916a2cb85b3eb0df31bd309eefeb SHA-256: 28e633c19357ceee5aadb0c5d0aae76cd4ce61752f39edea257a9735320e9bea
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple URLs, some of which are hosted on potentially compromised CMS upload directories. The presence of a 'download' button lure further supports the phishing or malware distribution objective. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16094c62432f46---joxanerifef.pdf In PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/aac679181a581cc94c48013f809488a0/58382480494.pdfIn PDF document text
    • http://proxima-design.cz/files/file/60532379833.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/fajumovubunal.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2563ba821---6311831654.pdfIn PDF document text
    • http://minhvuongthuphap.com/upload/ck/files/62157071664.pdfIn PDF document text
    • https://t2sc.me/userfiles/zetumorazegakevaduwupune.pdfIn PDF document text
    • http://msinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/sotudosobepimetawirawo.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160921a4622aee---jemox.pdfIn PDF document text
    • https://beautyreviveshop.com/newerac2c/userfiles/file/faronufibatakeduj.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/xinosexukalubakelubezat.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/39266391696.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607247df71627---80008202432.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/a2ojqmsr6976ner5998r962od5/32230423763.pdfIn PDF document text
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/bufinujozakamof.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac10129eae0---mopegemezisakeve.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/70a708e3af3196b22451b7621f7998bd/58816156348.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd8fc06f44---wuvijew.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/1ac0a93134aa170dd3690b830735dd39/zenusomuporu.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16091595371e40---3743035069.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160fa004a36c56---89723336503.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/43830206527.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=prince2+foundation+self+study+guide+pdfPDF 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_off0000fc6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6D 11132 bytes
SHA-256: a437a317201c8aae2233f1e95305f49aa17625076176fd6d61e2e584bf03ebc9
font_01_sfnt_off00011671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11671 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E83 17672 bytes
SHA-256: c8fd4d1dca7f3b43cee0a4e0656a252186c754dd49c4384e91292df304a60f6a

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