Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bbb10ecaa3ef8eb…

MALICIOUS

PDF

69.3 KB Created: 2021-09-08 09:52:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d295f60723ac54a6aede202a4fe80b4d SHA-1: ffad1d49113aeda909b7bd29ee68672b7fb1828f SHA-256: 1bbb10ecaa3ef8ebdcad6f8e3f4bfa1d57d473f9a1e3f73d3c0fd4ceac20b41a
72 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript and a significant number of external links, many hosted on compromised WordPress sites. These links likely serve as a link farm to redirect users to malicious destinations, potentially for phishing or malware distribution. The use of JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3848

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.
  • 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
  • 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://archism.ru/uplcv?utm_term=pbis+matrix+pdf PDF link annotation
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607b31047df2e---fuwoxoluvebakijaneb.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd724a8e02---41155292749.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160e77c9965f09---82944447485.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/jefavupibebas.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/rokudubekutewanevapefoda.pdfIn PDF document text
    • http://anupbolivia.com/images/files/rajanovatasid.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a79754d50cc---24241471965.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/21481636977.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/72509163982.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16077e12e1aef2---bolewuselironi.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/fabefijidafewagik.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/nosugifenuvanebenan.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160917e3b6610f---wexef.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edfc526f2a9---nufetetirufomejowi.pdfIn PDF document text
    • http://capri.lt/userfiles/files/49084746050.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608286c0d644a---41774401171.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/13510385721.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/jepuzojepobogepo.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0c0341b93---tumuturofifisizipebikapil.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/30297208370.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8f6e2b8dad---nafawurogidexogelu.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/xujigupobigi.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc34fcd3e7---67008051345.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/49858144190.pdfIn PDF document text
    • http://cloverpark1960.com/clients/1/17/17c242f0968dc4bce059666b43fbd075/File/28721728515.pdfIn PDF document text
    • http://physocare.com/Images_upload/files/7347848235.pdfIn PDF document text
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/narujinozabetedeladu.pdfIn 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_off0000c181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC181 15964 bytes
SHA-256: feb85e54db8b44841cf1344524e2a2dd836f75810889206d653344f44306e637
font_01_sfnt_off0000ea2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2F 10500 bytes
SHA-256: 7620bfd91d5a7a36cf62b84f3890a4463e9324eba04e0871e715200bee2ba2f4
font_02_sfnt_off000101e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1