Malicious PDF — malware analysis report

Static analysis result for SHA-256 28e0b0f3f28ce151…

MALICIOUS

PDF

68.7 KB Created: 2021-09-15 13:30:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: ffe1024283fcd90c52e8a8096759c181 SHA-1: 0dbd37b9abd4787a75d4207cf49110992eaee1ea SHA-256: 28e0b0f3f28ce1513927595f89add21dfbbbf8ca5322c0f60e9a0c041da9a8fd
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to lead users to malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification strongly support its malicious nature. The file's structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://mimpi1pusat.com/contents/files/vujeja.pdf In PDF document text
    • http://artgrafika.cz/userfiles/file/vaxiguxixaveretol.pdfIn PDF document text
    • https://transturist.ba/ckeditor/ckfinder/files/files/47209672325.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/fuxeritufedewupodemozew.pdfIn PDF document text
    • http://nyitotthetvege.kastelyszallodak.hu/userfiles/files/12911070911.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff1cc726e1---24402947166.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141854d01e97---towugefik.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/3a83fd8b34fb7548692b1565450aaeb0/95414527754.pdfIn PDF document text
    • http://dlabiura.kbo.pl/ckfinder/userfiles/files/zinonajigevoberazekana.pdfIn PDF document text
    • http://membranekeyboard.pl/_data/file/13213759792.pdfIn PDF document text
    • https://denimder.org/resimler/files/komurujuzedijigoril.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/3081509543.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/34427916810.pdfIn PDF document text
    • http://www.nbc.com.vn/ckfinder/userfiles/files/mipasekutudenad.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/47740187942.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/37739401810.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/10322636468.pdfIn PDF document text
    • http://boletos.luzservicos.com/ckfinder/userfiles/files/wewilevaxe.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/45427817504.pdfIn PDF document text
    • http://jiin-torng.com/uploadfiles/20210907215339.pdfIn PDF document text
    • https://franchisefarm.franchiseharbor.com/files/files/maluzukitukokopil.pdfIn PDF document text
    • http://www.larucheapain.fr/ljk/file/68804746258.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/fodepudewotuguk.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f09671d99f---xinivoruwof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=the+8th+night+full+moviePDF 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_off0000b1cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1CF 14324 bytes
SHA-256: 0a8193b6713aec470a495b6fc78d318c60f6f0336e83ff916b86c319f0db11e1
font_01_sfnt_off0000d5ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AE 10568 bytes
SHA-256: 58d8429120736e1c729f87f11b999c6cd9af03d4d124af52a8c45faf644fc73f
font_02_sfnt_off0000eda9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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