Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf10449cafe08f68…

MALICIOUS

PDF

94.7 KB Created: 2021-09-05 00:45:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 482341626447ed2f346dd0f6321d6f81 SHA-1: 35a20a89ba5d3250b0e8089e45ff63f4c194172f SHA-256: bf10449cafe08f68e9813876c12a8626f5186514ca37213c3f7fd8ca8f774f7d
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users to malicious sites. The numerous external URIs, many pointing to compromised CMS uploads or disposable hosting, suggest a link farm designed to distribute malware or conduct phishing. The ML classifier strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crewmak.ru/uplcv?utm_term=etica+profesional+psicologia+pdf PDF link annotation
    • https://aawyx.com/sites/default/imageuser/file/sunibelerelidoza.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/72417387323.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/91919606066.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/34721354341.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160761f6c2afa9---nabogi.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/5fkqvr5fdf8oj2vu0ka0rdirh4/kikudawisakijovofir.pdfIn PDF document text
    • https://badoza.net/userfiles/file/43113872777.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/jilanovulepegufadipatiz.pdfIn PDF document text
    • https://majubesar.com/contents//files/gitugojadoguwozuwurujugit.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/101ea66a830bb1ab43aae10feb97dfff/sarekuguxa.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1347d786a7fc7ba95b4613cea2f9ae90/43167518520.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/6ed1ab968e0b6362419b56ce01dc09d1/tupaxigikupuza.pdfIn PDF document text
    • http://www.ortodonciaelisafarache.com/ckfinder/userfiles/files/53785297279.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d07a2d904---xuvaruf.pdfIn PDF document text
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/monawivupirawa.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160adeeadaf4b1---36331520864.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/8d1dc8570be3202eff2bfbb798e028d1/68845063907.pdfIn PDF document text
    • https://a-metal.e-giant.net/archive/file/files/sekonemotubej.pdfIn PDF document text
    • http://starlightcelebre.com/clients/4/43/43e9139217482d7666ce300faf566241/File/mokimenavorikepogope.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611714128d27d---boropapum.pdfIn PDF document text
    • http://chineseclothingonline.net/File/gojovivelota.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1818e3cdee---lafalo.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/lomuzarumego.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/varabe.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_off00010d63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D63 18008 bytes
SHA-256: da9b0ede3e6126e752a6fe052d7cb1a3c6912426b1bc5c9cc6bb6530a2a403a8
font_01_sfnt_off00013c2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15444 10776 bytes
SHA-256: 1f56c064d5224bc10c3e796129777e1a6a7c2d1df42f2227e8d39600f7e31ebf

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