Malicious PDF — malware analysis report

Static analysis result for SHA-256 a22840c5f582c7b1…

MALICIOUS

PDF

72.3 KB Created: 2021-09-04 06:05:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f165062720f478666ff5d6d606931890 SHA-1: b12729070201682720d48109e32ff75d98c265ef SHA-256: a22840c5f582c7b1d798dd9733999007b9aa831d2449f73fbe294e315ef9195f
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous compromised WordPress upload directories, suggesting an attempt to distribute further malicious content. The ML classifier strongly indicated maliciousness, and the presence of multiple external URIs, including those hosted on potentially compromised CMS uploads, supports this assessment. No scripts were extracted, limiting the ability to determine specific execution methods.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd33359f1f---vudanelupikagilo.pdf In PDF document text
    • https://vinatech.com/userfiles/file/83852917370.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/9732555163.pdfIn PDF document text
    • http://shihtzufurbabies.net/clients/d/d3/d383cf0c90cf2d2391705d5438694b4c/File/90381217281.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/zimul.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/lejazusivipibaj.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/toguzuligidozipadigebari.pdfIn PDF document text
    • http://noithattamphuong.com/upload/files/vutijiwivur.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/4291018280.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/jozefiwefoxokazituwe.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc9e7757dd---32267111365.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/dc02d5ad5f8297d21f10d2b7aae0db7a/pivopujojidaruligoligisid.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/nuwesiroranevegane.pdfIn PDF document text
    • http://com123.vn/uploads/file/16788824901.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/d5def23f2c1ea3b4c8a401d03ff5672e/12418836652.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc71c5bca1e---24269179936.pdfIn PDF document text
    • http://unseretochter.ch/images/file/garogizasog.pdfIn PDF document text
    • http://goreskyreunion.com/clients/b/ba/ba087d28c24afe6c5bc45fa062332e47/File/31267845652.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af7cfdc0721---95881565407.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/bn1pb8otid5o11j2fhndij53d5/78389920955.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a08493a6a---vexewexezuja.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202108151058084601.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/e9155e20ae5f0410d9f54c83db02a102/kimuzupetidatudobojuj.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9806c400ff---96383201279.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/xosejekib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=nearer+my+god+to+thee+hymn+sheet+music+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA12 15280 bytes
SHA-256: 307926da90a509594535e6966852cfa40ac13963099b3e1e742a419cac1c7485
font_01_sfnt_off0000e107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE107 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f91e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91E 11212 bytes
SHA-256: 035895f946cb0f3ea1320ea3fa504037e6e0b5c8fb4532575413a6467aaed344

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