Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cbbb006a0552d40…

MALICIOUS

PDF

88.2 KB Created: 2021-08-02 19:18:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 090de247c2ccc4f5b1169a259eaf6e77 SHA-1: a516857337559e1d85c9ce798c02913f990c3e14 SHA-256: 2cbbb006a0552d4086da2c30742e848c30fdfd7424b0b37985574af2525e1123
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs hosted on potentially compromised or disposable domains. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics suggests a tactic to obscure the true destination or leverage compromised infrastructure for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://smidgel.ru/uplcv?utm_term=what+are+the+coolest+girl+dog+names PDF link annotation
    • http://studiogaleazzo.eu/userfiles/files/84318187795.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4dd618635---84375517534.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/9a98108b435a59b69f7c890d85ec3cad/wojazofomukederivago.pdfIn PDF document text
    • http://alanurturizm.com/rsm/files/gezoledadolin.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/7167828272.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160f1a4cdbba6a---luvijitaxuveko.pdfIn PDF document text
    • http://drjoecarver.com/clients/49355/File/ripotuwirigidufi.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/26253018488.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608f03eaeb85a---kufavamakas.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/5p8m33iu64s9cfm7u3mnv565t6/dikasojizosegizinukizoken.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/bisatekinupubalaxaxesisek.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__60C7C116308D6.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/db267a62563da86b1f6f0e02463cf875/15968639934.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607a322c56d28---pasuronewatorapuro.pdfIn PDF document text
    • https://vieclamkinhdoanh247.com/upload/files/kavumabuwixakax.pdfIn PDF document text
    • https://baongochoa.com/upload/file/jonunupapevokujim.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c3843467db7---deriwo.pdfIn PDF document text
    • http://thucancakoihikari.com/luutru/files/19195829071.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/gvek2k7c661gami61vnnib0ddp/poson.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/qd4bccfjdnhob69936g0qav4n2/vonupaz.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/78dc0a4d4012f7abd9c835c09721b06a/balirowipixozarakad.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/0c9199e6b15071f1eac10771d51087e3/78997410573.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_off0000f4d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D9 17432 bytes
SHA-256: d03095fa3c75811fce5775d158a0d5965627223d4bf9472f6da761548c284f74
font_01_sfnt_off000122a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A0 10808 bytes
SHA-256: 2a09323c5771c483e14c3b336f73da57ea46362a927a8274261d62e47480a18c
font_02_sfnt_off00013b2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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