Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a5230eb6dfd8159…

MALICIOUS

PDF

72.5 KB Created: 2021-09-25 06:30:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 92754739f83c2ea15b2743d591e1282c SHA-1: 179867af3b555748bb88ea063fafd0862a5d1221 SHA-256: 7a5230eb6dfd8159a84f7d653e5e21c821e6c4863e89d01111c03de10b411138
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The file's structure and URL patterns suggest it's designed to lure users to external sites by masquerading as a legitimate document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://irlanc.ru/uplcv?utm_term=truecaller+apk+2018 PDF link annotation
    • https://magerp.org/upload/files/2052547181.pdfIn PDF document text
    • http://a9188.com/upload_files/art_files/files/20210918_195743.pdfIn PDF document text
    • https://rjpexport.com/files/58371860512.pdfIn PDF document text
    • http://top-rubber.com/admin/fckeditor/editor/filemanager/connectors/upload/file/42312623139.pdfIn PDF document text
    • http://adamex.ukrkarta.ua/fckeditor/userfiles/file/57269469340.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/84404630268.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16136d0494074c---tegijigerel.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/benedusilowewezufefikiru.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/xupejuwapalojawa.pdfIn PDF document text
    • http://synowka.pl/galeria/file/45236923542.pdfIn PDF document text
    • https://dom4m.com/userfiles/files/wanajixutanumugozudewobi.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb9bd1a0ce---88957527105.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/1crss3cn06bkqoiol9aglgigid/64832846390.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210917_97A3D93C9C7B70BF.pdfIn PDF document text
    • https://adesso-moosburg.de/images/file/32962351324.pdfIn PDF document text
    • http://cnsgawefgl.netsociality.com/upload/files/41177786337.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/karurovebirugegedibo.pdfIn PDF document text
    • http://www.letnifestiwal.pl/ckfinder/userfiles/files/nitesexotemamuxafirepaz.pdfIn PDF document text
    • http://royalleasingny.com/admin/images/file/batozuzexivutabonezi.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614787cbe5626---xefexovavilakewimokukivo.pdfIn PDF document text
    • https://norservis.cz/files/files/72372556918.pdfIn PDF document text
    • http://smelawservice.com/file_media/file_image/file/gunuvowufelatukuwoto.pdfIn PDF document text
    • http://ducnhua.com/upload/files/68469476936.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/76002115933.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e82df4fc9a---fevotajikexozagesexo.pdfIn PDF document text
    • https://totalsewa.com/userfiles/file/bulopasokatevejuxav.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/deea2f8421d4f8b2e8916bf5f4847924/mamemuvapawaja.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/94769885720.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_off0000b7da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7DA 10440 bytes
SHA-256: 96b7925df3d06b66b249350857bbd4cc6e99aac8408a4a29db28945e4459d650
font_01_sfnt_off0000cfc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC5 17080 bytes
SHA-256: de4bffed1c955d028916a26688d8dd0918159ea8580af27d0cfd9be0468722c6
font_02_sfnt_off0000fc07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1