Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf438a90be514ea2…

MALICIOUS

PDF

80.9 KB Created: 2021-09-17 11:00:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 56a843129ef1ab156615872023e7cf39 SHA-1: 8e8f30334a1b3ca2feea6328e26667109f83831a SHA-256: cf438a90be514ea27ebe681f89b781159ba4cb51d13d4996b328d9e79618a4da
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS upload directories, suggesting an attempt to host or distribute malicious content. The presence of a 'download button' heuristic further supports a lure-based attack pattern. While no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the exploitation of PDF vulnerabilities to execute a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://agnieszkapawlik.com/userfiles/file/51315829490.pdf In PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/24245058368.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/nunufuxenifuximox.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/38052852007.pdfIn PDF document text
    • http://oskarmak.com/userfiles/file/wiwikebedupebos.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/e14cc6ecebff60e4be1d244e60b3cdde/gijurinolibojut.pdfIn PDF document text
    • https://www.bosingels.nl/ckfinder/userfiles/files/83104267982.pdfIn PDF document text
    • http://desiaussies.com/ckeditor/uploads/files/busus.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/f80ea0a8896341e288510d92b2b8a29f/zowakopemakuzizanarex.pdfIn PDF document text
    • http://stepasidemedical.ie/images/uploads/file/zimapebokanapupug.pdfIn PDF document text
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/37231924574.pdfIn PDF document text
    • http://rudolphi.nu/userfiles/file/74953828930.pdfIn PDF document text
    • http://usairsprings.com/userfiles/file/rivuxex.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/68335626966.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/29803954049.pdfIn PDF document text
    • http://mebco.ru/images/file/35715750382.pdfIn PDF document text
    • http://www.grifin.sk/files/92135125378.pdfIn PDF document text
    • https://kaparatt.com/images/File/nigetux.pdfIn PDF document text
    • http://teknis.it/userfiles/files/bisolawebupum.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/fizila.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/4a4707b2558bada8bc0a74c227b18011/16708732314.pdfIn PDF document text
    • https://nasikampung.info/contents/files/78509462686.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/19508293023.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16142b9b95acdf---53322928778.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8250e4b589dff2326e8745d98b14a03e/povet.pdfIn PDF document text
    • http://piotrkowska77.pl/zdjeciafile/gubagapalejonotu.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/52992783009.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=descargar+mp3+desde+androidPDF 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_off0000d264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD264 10888 bytes
SHA-256: e07966bc9f3d539d58479bcbff314efc68e9b2c412605abf976ebea4996f1cd8
font_01_sfnt_off0000eb5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5B 19208 bytes
SHA-256: eb253c406261f97f00c5e736d6c140f2a820de3b1b651c62bb1b6dffcaac9291
font_02_sfnt_off00011d82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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