Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2f3049d6588796d…

MALICIOUS

PDF

77.2 KB Created: 2021-09-10 21:56:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4052e91338faf53909c5ee5fd890ba09 SHA-1: d35bab4dc6756c29e3b1b8499a574085f40e0487 SHA-256: b2f3049d6588796d465ad7ebcec8dfd7303a0e460630bdaa6f64c88a209e8a4c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that function as a link farm, directing users to potentially malicious websites. Heuristics indicate these links are hosted on disposable or compromised domains, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://ketchas.ru/uplcv?utm_term=harry+potter+full+movie+1+in+english PDF link annotation
    • http://encino.ilovepokebar.com/uploads/files/dofokowonab.pdfIn PDF document text
    • https://coffeetuanvang.com/Images_upload/files/guloxafenuxesumapibifoguj.pdfIn PDF document text
    • http://unibox.lv/files/text/tidozejubudeximedetuza.pdfIn PDF document text
    • http://odumakus.com/uploads/files/xugezasojukebax.pdfIn PDF document text
    • http://konberdbio.com/upload/files/60856662378.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613732c2532d6---99665544277.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/52940734782.pdfIn PDF document text
    • http://cycling-software.com/files/file/77417840915.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/71982974769.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/73392430171.pdfIn PDF document text
    • http://jdjcnc.com/upfolder/e/files/20210902102554.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/50121735293.pdfIn PDF document text
    • http://kieryk.pl/img/userfiles/file/mafivaza.pdfIn PDF document text
    • http://mudrberanova.cz/userfiles/file/dumejedanadezudikofezi.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/21732174797.pdfIn PDF document text
    • http://asavn.vn/uploads/userfiles/files/72362352978.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/9307383927.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/96926643637.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/kolepisukakukuxivivelam.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/69781408509.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c0d398843---43381328026.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/2695c712fed8d3c54c3fa4b72563cb7a/70268182354.pdfIn PDF document text
    • https://cherrychile.cl/cherry/uploads/contenido/files/xosukewuk.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_off0000c704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC704 17888 bytes
SHA-256: 998b9efa6c398badd8407d63c0ff4945dd0153957a3d6aad9dba022936066442
font_01_sfnt_off0000f5ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BA 11128 bytes
SHA-256: da87b7bc1dc289449efd32a7d9da20d0c6a2a1db267786c58589eead7dd42804
font_02_sfnt_off00010f8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1