Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1fa4fcd11d2563a…

MALICIOUS

PDF

70.9 KB Created: 2021-09-01 09:13:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 9acbd2286f9758d8b658813174860ee3 SHA-1: 4e2f4295f603f57f631b7042b81715842cb4ef90 SHA-256: f1fa4fcd11d2563a36cf2353bbcc3eba29386fa338d267abf0ad4efb8fc5c3f1
156 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 websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The primary attack pattern involves directing users to external, potentially compromised, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/ab0o6hefms2f5p0iun9n8l7hm4/wunekeni.pdf In PDF document text
    • http://jl-vacuum.com/upload/files/bametenikekomoro.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/toruzezewijim.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/31626609329.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/15684123060.pdfIn PDF document text
    • http://nppmaudaha.in/ckfinder/userfiles/files/61658578395.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd372f2bcae---xavevavuvotabazeluzijoz.pdfIn PDF document text
    • http://redemaisfarma.com/userfiles/file/tozulexatijapapiraxin.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/742352c49438beecff55ceea3803d264/wepogon.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/ruvenol.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16084528be5a97---64287067120.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/54606866398.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/27490721106.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/3e24f3c7e9e0e5638255cd1b49e4354a/94233372830.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/gufafizupudedonowiramapiz.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/161217ca3a7181---wulejapututeripujela.pdfIn PDF document text
    • http://surveycook.com/upload/tmp/202108/file/luboxipu.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/fofiwuzewarejo.pdfIn PDF document text
    • https://noddy.nu/images/file/83997061174.pdfIn PDF document text
    • http://nocenzura.space/web/img/podborky/files/zipifam.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/pufegazebovej.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/fhoen7m4b7elqr48ukck2dti54/gebeduzasaxitisixebexulog.pdfIn PDF document text
    • http://centrumbiznesurawicz.pl/userfiles/file/99617412025.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/32838370139.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=screenplay+contests+2020PDF 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_off0000b5d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5D8 10708 bytes
SHA-256: 0b6a299e62228ee0e0c78f98625c34954b347edaabaa1bc917aa8b83ee5d0b63
font_01_sfnt_off0000cea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e6b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B7 15512 bytes
SHA-256: 40cf18228d4d274b9a8fd93bf9930685c6d85fbd7684fe538a0f685553fa6a71

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