Malicious PDF — malware analysis report

Static analysis result for SHA-256 09a77a3460cf2044…

MALICIOUS

PDF

87.4 KB Created: 2021-08-03 11:45:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 32b4b2d41fb5a3125889480c656e2274 SHA-1: 5d7361268f61ae43e56102a274efb59da29f2285 SHA-256: 09a77a3460cf2044a1f4a49dbea22d86ca8dd83d4e779cace2e01c38aea2834d
164 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, several of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading a secondary payload. The presence of a 'Download' button heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://palyavalaszto.hu/teszt/upload/file/80973766996.pdf In PDF document text
    • https://mertlakustika.cz/images/pages/file/pupokapujatukagowu.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160988e2f7fab8---givulotuwiropofigenexolog.pdfIn PDF document text
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/zilotekebesofujapomon.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16075cd26a9d21---28937382237.pdfIn PDF document text
    • http://filatelianumismaticaumbra.it/userfiles/file/25377800182.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/87990500246.pdfIn PDF document text
    • http://argumentua.com/i/file/seramamatatazipebake.pdfIn PDF document text
    • https://kildevangen.dk/files/11490195983.pdfIn PDF document text
    • https://tsegypt.com/file/44570890737.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/68724283137.pdfIn PDF document text
    • https://airflow-skateboards.com/userfiles/files/fuwules.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7a3300675---57525655857.pdfIn PDF document text
    • http://vizesblokk.hu/files/file/fokaxutukup.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607386c4ef6f1.pdfIn PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/jiveniratanokilex.pdfIn PDF document text
    • http://minhphucvietnam.com/uploads/userfiles/file/wizat.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/d72c0e130fc39602766983289cb29d59/xupopakepamusivurazumobud.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/98176495802.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/20p8ijou07s5pf0p03acpf0vkn/52465166751.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/0ae54c412d05bfab656ef192ad9613ba/mokatinagatisonavumaga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=free+registration+code+for+wavepad+sound+editorPDF 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_off0000f139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF139 10976 bytes
SHA-256: 952139cb6656a8483dae27a3264218a02b8f4a6ebcba9521160c6532bcb08204
font_01_sfnt_off00010aaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAF 16972 bytes
SHA-256: c2efd45df57083ac39df60849536c976dceb2431d80cc07e49e6f777e525902b
font_02_sfnt_off000136c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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