Malicious PDF — malware analysis report

Static analysis result for SHA-256 223cfdb7ff5a1f64…

MALICIOUS

PDF

85.8 KB Created: 2021-07-02 10:03:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 0220954ca49c2249c3e1ee81f8d45140 SHA-1: f7e57e234fbc0b32183c2dcaf5e7bbfc8e7a104f SHA-256: 223cfdb7ff5a1f640bc3fcc6773532782d2b81e4fe0adf4023337cb39e417420
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent. The document appears to be a link farm designed to redirect users to potentially malicious sites, possibly for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607100fde046a---vutepagugobezevapevezami.pdf In PDF document text
    • http://studiolaviano.it/userfiles/files/69536461983.pdfIn PDF document text
    • https://tavio.ru/files/file/wekonuvigeze.pdfIn PDF document text
    • http://bdn10.cz/files/file/pijati.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/wapofunubuxuwob.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a0728e689---904597505.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/fofiwupojebemazazizuzos.pdfIn PDF document text
    • https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/nfu4ks1v8bscko23kgoko3lm9t/88256307645.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e25ac82f7---punuwulijeratebobi.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/4be706d160fd500e51179107dc79fb69/33299373198.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16080b35e45f93---11008221073.pdfIn PDF document text
    • https://rajaunited.com/contents//files/jiwuvuxebipibes.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/62845341613.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757883c342c---zivozubomuxiwegifudegumi.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/94950346178.pdfIn PDF document text
    • http://accronline.com/userfiles/file/jimupilekikowava.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/f185030371c3d5a1bf31d5c84f14ecf0/vitasexavuzodazilaxesure.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/ce265f821cefb34d6a27125adcc3ccd3/jadoxi.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bdfdaa5a489---87790679676.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/289fed4c8d0a1832f7bc894b4385c2d7/23127338672.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/4f966412b358a2e7ec592280939e9433/jasinofinazonoponuvimu.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16075da4df231d---vujesomepuredoki.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/vizuzidazafobozafavit.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609f49e4e4e5f---15461464908.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=at+what+month+do+babies+sitPDF 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_off0000ee5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5D 10572 bytes
SHA-256: ff84d1e06fc9c9b9ef343511915d9a377e91efa574bc50d7b8463370dfbaf5b0
font_01_sfnt_off00010668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10668 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E7A 16656 bytes
SHA-256: de9279a6f41eadb643f81f01ce85f160c079f5b8459199423cafe44cacc94afa