Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6f22550c7f05f2b…

MALICIOUS

PDF

73.7 KB Created: 2021-09-22 14:56:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 02dfc460e5b203c8f62f86b406e2e1e7 SHA-1: bf3dd20ee59ecb1b17b857537d83d73095dccd7c SHA-256: b6f22550c7f05f2be024bbfb81e80dae8381f5e3cea817ead5e2d423dedef049
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a link farm pointing to compromised WordPress uploads and disposable hosting. The ML classifier and ClamAV also identified it as a phishing trojan. The numerous embedded URLs suggest an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://medvor.ru/uplcv?utm_term=evernote+on+android PDF link annotation
    • http://niktid.ru/userfiles/file/xajatuloxegonutudorako.pdfIn PDF document text
    • https://birotex.rs/images/files/kabivimekisolesadem.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/dumimabafulojobimurito.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613935cae63d7---valaxazulerolebopisu.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16136742de5752---wuvudetodoro.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613a79383251d---lusunivukajabexidiwunivep.pdfIn PDF document text
    • https://megashina24.ru/files/files/21796734978.pdfIn PDF document text
    • http://sapaelitehotel.com/webroot/img/files/rorukote.pdfIn PDF document text
    • https://servicenter.ro/ckfinder/userfiles/files/16151266967.pdfIn PDF document text
    • http://musicincw.com/fckeditor/userfiles/image/59234570833.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210916_050840.pdfIn PDF document text
    • https://tradingcall.in/ckfinder/userfiles/files/ralunafe.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/7d938d9118fcf17d8b868ab63fed6e31/50033364909.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/87867901438.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/duxakevuxelemopidesigek.pdfIn PDF document text
    • https://fiscalonline.ro/app/webroot/files/userfiles/files/97174848988.pdfIn PDF document text
    • http://bainihu.com/upfiles/editor/files/87890694081.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/62438676821.pdfIn PDF document text
    • https://csodamalom.hu/files/files/25353558760.pdfIn PDF document text
    • http://angelascanu.it/uploads/file/75008691026.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/12743267557.pdfIn PDF document text
    • http://montazerangroup.com/uploader/file/mekiven.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/87870188144.pdfIn PDF document text
    • http://banquat.com/userfiles/files/kewetal.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/janovuzekeromadazow.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_off0000bfcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DD 16860 bytes
SHA-256: d14d1ec78da7d2c0490a1b20fd5d9981a0eb627cc369c065138fcc7ba99dd080
font_02_sfnt_off0001032f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032F 10076 bytes
SHA-256: 7cdae6df072d67f0acfe5764ee9dffae63f5226e827d64cebe01bb4a169a8837

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