Malicious PDF — malware analysis report

Static analysis result for SHA-256 688c2038b3ac193d…

MALICIOUS

PDF

89.7 KB Created: 2021-07-30 05:26:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e1eb0a063a6a4bafe0f31da8f62e2846 SHA-1: 8aa8d61c75783981c22b5c45a0ba1597ee705133 SHA-256: 688c2038b3ac193d2c226d9eb5204d813da2b4de458faf08fd450972a3aae750
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to lure users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/fq5c5h0fepf5olm411k98aimu8/poxeburowefemememivok.pdf In PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/71311890726.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/67b24d4a0401e47a7499e4456c1a8078/faposaw.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/58793530043.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/51065771214.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/1sumn2pshcurfc8ev61amrufjm/kavavatuwufakuxopoza.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094bbdd39983---sonuxotazi.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/pblmhler1gpnvguqrnc1b2u17o/wumejisajuzinukufotikor.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/68ce09d31f561c6a76fcd1d7ed5d3823/benonugerafoso.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/makix.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/4g200brref44d9tca5mc1rso3c/guxojulatiweresive.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/46357986827.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/24be7c5489bf438e4bdcdd8e4104dd10/56216856187.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/mekelup.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/95894c2da78898f3a6267f383d906f20/53479646840.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/9j13res4n74amoj00felqal7b5/vareputigasusajeber.pdfIn PDF document text
    • https://exihomes.com/userfiles/files/11919236069.pdfIn PDF document text
    • http://asfalon.com/__files/file/luxanuku.pdfIn PDF document text
    • https://chris-arnold.com/userfiles/file/40152523803.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7c7d5ee6c---60425059662.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/4464a9e8122dc3f3b7f61c71fe8e6329/gubudalepavixelufugun.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/momukovomodefuku.pdfIn PDF document text
    • http://abwva.com/uploads/files/lokusujogolupubikazir.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/rusobeza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+bypass+mega+limit+2021PDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d22b5040376---sejaxabirelemedo.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_off0000f8a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A9 11016 bytes
SHA-256: b0478ad2167e40e5ded6e6191cf62d34bc3f85b1e36dc9edfca1602fcb9ec02e
font_01_sfnt_off00011235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11235 16864 bytes
SHA-256: c1d45762be56eca440643f6589e20b1009fdccb057c21d54e300b863375935a3
font_02_sfnt_off00013e5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1