Malicious PDF — malware analysis report

Static analysis result for SHA-256 977954992267ba59…

MALICIOUS

PDF

82.3 KB Created: 2021-07-02 11:01:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5f7e8261318e1a9409f6132d69adff89 SHA-1: c1a55c71f8025aeb1a52f50eceb10caa699708f9 SHA-256: 977954992267ba59f8f6d6e69c2a4fcf76c2b1ff39d847824e0c9f988908d9d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm that directs users to multiple external websites, many of which are hosted on compromised CMS uploads or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609851857cff8---91203973378.pdf In PDF document text
    • https://windsbs.biz/files/file/tuzutabowumivodolefape.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/cff36713bb1c748dde7246ef0c12d546/6880514737.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc34551cd9---jawedove.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/nasugo.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/12490983578.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/galusawajef.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/74036672119.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/ee1a76287f78acca5f2c464bfd57ea7b/52577208025.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/tibunexewuxerasigefilem.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/tuwikizofumakoj.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc3c773dd0---silederu.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/63ca7e36e02b0653986d28fa90f253f8/kedotepegab.pdfIn PDF document text
    • http://hopkinshigh1988.com/clients/75739/File/tezigewepi.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/5d94883c2d16dc505bef22136318d444/62581820788.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021061800563273499.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/44532027646.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/08ou58ctnt64ie6kjvcdb1dju6/tevimulunutodupuxizuw.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d02f1b8b871---polewiwoberelatesazax.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607158f0723ed---xibogape.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c21ebd4fd06---maseg.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/vizakegalisabodelerogo.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085773e458d9---52272669020.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/39187112368.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a97bd5ea79b---99790045446.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160702c87218cb---lemuvusaripapenakajakumuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=neuron+and+synapsePDF 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_off0000e21f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21F 16368 bytes
SHA-256: 5532346fbe173d9f4313b51b4fb02f01d5b7280517d4834c096c2055c27e723f
font_01_sfnt_off00010c8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A3 10340 bytes
SHA-256: 30c46788d63cc2e40b3fb52a46728f267cac8d0eb3b6f15fced10536f48f0171

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