Malicious PDF — malware analysis report

Static analysis result for SHA-256 241336fd79fe724c…

MALICIOUS

PDF

104.6 KB Created: 2021-06-09 19:10:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 8c50b5042576642e8dceb05cbdf444e7 SHA-1: 2dd8063de67be86c0dabee0428127ee5b9e68494 SHA-256: 241336fd79fe724c1ad8e356b213cd7cc01cee001856c4ce23ae7fba5d2e8908
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laborke.ru/uplcv?utm_term=relentless+from+good+to+great+to+unstoppable+pdf+download PDF link annotation
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/qd5mdql82p9oterj8bm7gllql3/14375633067.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608beeb1bae13---lifunujovedejivati.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/gosatekadisuledimexasone.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/99001019272.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16077556bd47eb---fabizodekuwowefusufomigo.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16077b6f5066e5---wuguwutosenuf.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/3ipir7j8mpoakvde0ts13h76qo/genemejawutigu.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210515193625.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/08bfd3a521b14406882fb062c18f88d0/miwodef.pdfIn PDF document text
    • http://abc-tel.ru/data/File/kozazovenajutizuwipode.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607269b244a5e---foxikakefudizeduvu.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b665a1af3bf---nusosutulapo.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/lumesazinetab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB13 15444 bytes
SHA-256: 607d282f6fcac9061eca7b438e69dca902c39f31ac536e209359580409b5d5a2
font_01_sfnt_off00012d0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D0E 5600 bytes
SHA-256: 4be0b3f6e5936c310aafd90ba75ffb9561743d1e0f6fb880ed17cd6945b20ef9
font_02_sfnt_off00014009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14009 5768 bytes
SHA-256: 5ce32de88ed465015e466c0b7eb796965ac964cb56760e28f42231d8a5ca4f77
font_03_sfnt_off00015065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15065 12848 bytes
SHA-256: 5569e74b634e525422d7df0d7b4312754eca04eed164ce02605f6eb0c15fa855
font_04_sfnt_off00017a28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A28 16884 bytes
SHA-256: 57b89d1e4311a881cdba967c613d1caa7ab98f8028468bdaf5d3bb8b84a03fd1