Malicious PDF — malware analysis report

Static analysis result for SHA-256 049d8211054385cd…

MALICIOUS

PDF

81.3 KB Created: 2021-09-07 04:16:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 594d900fd418b597b8bc02deac9eaa23 SHA-1: cee79d23c16540726910bfd05fa959d81eabaabc SHA-256: 049d8211054385cd01a4d07caa67c784bcf7ce6560217edfebcfe1ddcf468c51
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, identified by heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM'. The ML classifier and ClamAV also flagged this file as malicious, indicating a high likelihood of it being used for phishing or distributing further malware. The embedded URLs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://caydinhlang.net/userfiles/image/file/zeritiz.pdf In PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077e1bd28ddf---vepufivun.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/fososodojuviwobo.pdfIn PDF document text
    • https://siroyensao.com/upload/files/tavow.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/d07701645ff747677fc7afe1c81cb274/gerovafubamasifokejipem.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/29129101628.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont/file/77115733029.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/zanisa.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/givugetixuziw.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609852fb10d9a---rudakajisibinewov.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/fudinefujijonoronivo.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/64263326934.pdfIn PDF document text
    • http://travelspace.pl/userfiles/file/40519353157.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/gajh6mj18d4ksasvaavlnhef3e/juwulobimavefo.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/likijanalevibawure.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/fichiers/3513993531.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/60521415460.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609cef2e96e17---folelipunogixusumorota.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b98e8d59676---xularibunovilitote.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/fadagunejaga.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/18077569023.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/16818993734.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/99348458385.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=recetas+vaporera+electrica+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_off0000d57e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD57E 19080 bytes
SHA-256: 697ec215ae7917b25c654e8158e34ee29f5a1b1f9a2125704f7a72c3f27342e1
font_01_sfnt_off0001078a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA1 10620 bytes
SHA-256: 85a143c9742bcc716d8af5a68db9091bfdb1becee32cd193daa9714cda61737a

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