Malicious PDF — malware analysis report

Static analysis result for SHA-256 be82929de2a71be5…

MALICIOUS

PDF

92.0 KB Created: 2021-08-02 16:47:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 610e59916f7c2003bae7c6cde8b24de2 SHA-1: 4789b3939a40cfb71baf98286cfc99564607e8d8 SHA-256: be82929de2a71be5228447fec5a7523dfa4d9ebb7969da5aa27810a4d849a77b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. The embedded URLs suggest a phishing or malware distribution scheme, likely delivered via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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://eko-inwest.eu/upload/file/37502352848.pdf In PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/53801238246.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2cc197425---60121465956.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/10533072504.pdfIn PDF document text
    • http://poorclarescork.ie/images/26063652751.pdfIn PDF document text
    • http://klubalfa.org/img/userfiles/file/97657691119.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609777a4186d7---tatexopojemo.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/pefaxofovikigikutavun.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/mozujusezasenabob.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105a65ce0d94---nubasojunolaxowi.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/43304f14e0dc3b784d0328fd6f5ab2db/vokajatebafet.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/38398198930a30ef8d01ab0c5b7fc550/46256817518.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/064f8e4ca4e736a0e988db62f7136a3d/wapowija.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7df900e53---55884442599.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f457e4d0ca---57023725285.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df7c42d7746---8696906809.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/tarule.pdfIn PDF document text
    • http://magyaringatlanadatbazis.hu/dev/_user/file/27339735928.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/7befaf80a19674638086a750358d4fde/pofodesesabito.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/b546fd64a8a9b7b57f3702ab8416a92e/sonizufukezapexuv.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b995bf24527---73663159703.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/didilikemadinura.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/tidarutowiratevon.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/84353374446.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/4c60d05e8f547c4fc478ffcac6b8d3c5/gozuvabidunonolugewudetup.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/20967750320.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+get+free+rp+league+of+legends+2020PDF 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_off0001022e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022E 11000 bytes
SHA-256: cad0677dd09f66245476eb06eacf2ce425625fb0b7918422be5eff1f964375c2
font_01_sfnt_off00011bc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC6 17188 bytes
SHA-256: c807c69461fdbf5e04535db30e27e16c595e3fe0ddb04703081208cc3d86f010
font_02_sfnt_off000148a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1