Malicious PDF — malware analysis report

Static analysis result for SHA-256 18cbada617cdf5dd…

MALICIOUS

PDF

86.7 KB Created: 2021-07-05 09:14:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6b70c5f16997a0dd5f8f9f2668be78e5 SHA-1: 35835bfa2ab4149d61cc2cc9b4d83f3e5437fc38 SHA-256: 18cbada617cdf5dd3ec4705ab925268766ca43b03b5a91b74d02b70becc549dc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The heuristic 'SE_INVOICE_LURE' indicates the document likely uses a fake invoice or payment lure to entice users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://wastran.ru/uplcv?utm_term=excel+budget+and+expense+tracker PDF link annotation
    • https://apsco.ly/userfiles/files/12627655098.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089b279c65a6---94076265525.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/2c1a7f7490637ffeb33887bab4758734/11119391645.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/judojememirukupasita.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/770a4d4e904c24f7968b211dedb51a9f/82153797311.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ea9070f213---jowokur.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/4296409000.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160df3b166ef1e---23646362025.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/2844152119.pdfIn PDF document text
    • http://allasclub.com/campannas/file/97922803679.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/65c6e08ae44c441812f4b76474637e76/getojimofu.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/14441215763.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607568139ab2e---32132295009.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/23846916075.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095cf22ae084---rutapatukoselafogoni.pdfIn PDF document text
    • http://cy2hand.com/userfiles/sadowumedazexejenufuzix.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/fibolopewurelibaxavu.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/pixilotulorutoxanivo.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/wimadejodademusugidijijes.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/rarutakibitareguvenaxi.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/vvmdv6joosf4ldest6s34aqj5t/xonijalodek.pdfIn PDF document text
    • http://anadarkogomezfamily.com/clients/7/76/76920377ef4e0cfe2c6e77079a05cbd4/File/73929280202.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/72747702389.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071dd4677caf---22370125269.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160742a9beca21---99182034862.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a53167d63---82347547208.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_off0000f06b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06B 17104 bytes
SHA-256: 063969b957af0840fb27363e82d5150ed45cf01589963745a470e83fdc2f3a1d
font_01_sfnt_off00011c6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13483 10896 bytes
SHA-256: 67b866858e9c76e928f18f9881f86bf14add3e61f3ae206bf2cb8bbc4852050a

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