Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cc90233f4698805…

MALICIOUS

PDF

69.3 KB Created: 2021-09-01 13:52:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bd26fbe3000f7df41fa1b051512f3c21 SHA-1: 04f584defa70ab4f500e2b09a049eb55d21c8a8c SHA-256: 6cc90233f46988055fc18d41d858af1cc4f06db77d45b027fc1c3266e30552ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://pixomot.ru/uplcv?utm_term=uptown+koffee+and+kafe PDF link annotation
    • http://staceyasp.com/UserFiles/file/49290141080.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f976cd6aef---katigufurelotopazaluvoru.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/99722266360.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e3fc57047df---mofifidudavon.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/00422b9c5bb8cdd3b261db1f187192d2/37516045457.pdfIn PDF document text
    • https://x-software.cz/data/file/depenavimob.pdfIn PDF document text
    • http://zlato-stribro-investice.com/upload/files/negad.pdfIn PDF document text
    • https://vaynhanh365.net/contents/files/wupilulupoweletex.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5d5ac45cf---modetamidu.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/aqqjuc15frq788kuso8cfm53uc/50002958514.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d387bb1d2---25681623374.pdfIn PDF document text
    • http://fritz-fahrlaender.ch/download/peginofo.pdfIn PDF document text
    • http://veewood.com/file_media/file_image/file/pogefol.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/lunoragezuvezivetexoxofa.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0nvs0uo5gtmd8ilt0n86rrhq15/86606317116.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/27638633303.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/90616982394.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/vofixiduk.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/50453cd4741680879e0d5ef2fc9ea6c5/57493220445.pdfIn PDF document text
    • https://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/48626606349.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/zomonitudaw.pdfIn PDF document text
    • 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_off0000b017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB017 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC829 16204 bytes
SHA-256: 39ae7d7179bcc957d9c5ae9e5fd7ee66cd860dc4607c3fc1b5dbd4367a4a120d
font_02_sfnt_off0000f134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF134 10268 bytes
SHA-256: 4719efb5e5895ad54ed90465e6276b8714104dd94ade0673bd14d65e10f2591d

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