Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c943fafadb206dd…

MALICIOUS

PDF

157.2 KB Created: 2021-07-20 16:06:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b8d0b40fe5e4734411e4a0643162a338 SHA-1: 88478ce88a467382debc1953bad053df9249e05d SHA-256: 1c943fafadb206dd8001a5321fde5c8011b9861de3dc3078f1213bce107a1238
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress upload directories or are hosted on disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest a phishing or trojan payload is being distributed through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9756

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 http://deltools.com/userfiles/file/zitababozosigajesuloxiw.pdf In PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9a3400146---nifutomibosabaralebifo.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb6ef7d4fe4---kimejedusixogafawaraga.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/zidosumowawibevevod.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c18c312a7---77098338688.pdfIn PDF document text
    • http://caythuocdangian.net/images/files/33659138889.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/kimafelimidenowoxunovadi.pdfIn PDF document text
    • http://sy-smile.com/upload/files/kokewoxufe.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/nivepunurap.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/kanilesagewolekur.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/vazebepuxovoganuwexeti.pdfIn PDF document text
    • http://punaide.com/userfiles/files/lezepezutake.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/buwabeli.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16084fc1f4e06f---47644561498.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/f3f4088a2fdd62ad5ee32d6a1e02b0cc/96028045443.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/88158947011.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/75937401804.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/0367e343dcde12324d1b519c7a034bf9/gifatitakegajosisapib.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/tekiwowudika.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/14d1b1d6ca57c743570903ee27e597aa/91162559866.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/kuwipokuderinupa.pdfIn PDF document text
    • http://sanruou.com/app/webroot/uploads/files/wurezibesojoneneru.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/88v1dcnc7fttafv84f31hdh972/rupuzesivukenuxa.pdfIn PDF document text
    • http://www.rafaellucenaehijos.com/ckfinder/userfiles/files/sebonatenig.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/9a08qglgd0117guuvlfli5fao7/rixizizigilesunufavuke.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/wejupifijoderesupumatufov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=christ+and+antichristPDF 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_off0002030c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2030C 10200 bytes
SHA-256: e122d70def344dbe4c5f66a6821d6704913800c986a6b8ce09e8bb5659ef11e6
font_01_sfnt_off000219dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x219DC 21856 bytes
SHA-256: e11986eb4e064a3fb88a8e901f2a66588375e0a000699a36394c90ddad542270
font_02_sfnt_off00024ff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24FF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1