Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad746db5348e0609…

MALICIOUS

PDF

76.7 KB Created: 2021-09-22 18:23:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d5af93515a6315dfce14692a52e476a6 SHA-1: 7bc4cb53a3f6ed548f4b4e62c66c5b15e021022e SHA-256: ad746db5348e0609ef95a2a53cb070651a0f0d8cd9775609845aa2bf56ac8166
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with multiple URLs pointing to potentially compromised or disposable hosting. The document body is heavily obfuscated, preventing analysis of its direct content, but the presence of numerous external links suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://airbays.com/userfiles/file/tenovow.pdf In PDF document text
    • http://xedaphcm.com/luutru/files/xeref.pdfIn PDF document text
    • https://temahr.hr/files/66912930624.pdfIn PDF document text
    • http://nitecoreromania.ro/files/file/menexevisafa.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/36687137532.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/zekamibanopetojalo.pdfIn PDF document text
    • http://autovoda.ru/upload/files/wefutajugakeniki.pdfIn PDF document text
    • http://juicy-group.com/editor_upload_image/file/30897823150.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/jedezavojazefaxabize.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/fihkml0eahrggqiu3dtpedqhi2/54293944705.pdfIn PDF document text
    • https://transport.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/tovevezelitazafif.pdfIn PDF document text
    • http://reflita.lt/uploads/files/kevumasepepuzuvevine.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/68635883724.pdfIn PDF document text
    • http://texmet.pl/userimages/file/96798503053.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/zarosexevi.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/52423592699.pdfIn PDF document text
    • http://quantri.thaisonpalacehotel.com/upload/files/86151952431.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/jalebe.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/tevazavebodufenelip.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f7771a346---tilujugovulolaxadupako.pdfIn PDF document text
    • https://synersys.fr/contenu/file/dazugifinaka.pdfIn PDF document text
    • https://finliz.lt/i/File/bibelumedomu.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/3cb5295fccda92342a68f8f0db330904/lefod.pdfIn PDF document text
    • http://thoitranglani.com/upload/files/29503189869.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=game+mendesain+rumah+androidPDF 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_off0000c9ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9BA 16820 bytes
SHA-256: 5fcfa527efcf94f2496d92f8eb5ab72e086bafd200c1a457b7460206aab812fb
font_01_sfnt_off0000f55f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55F 10508 bytes
SHA-256: d2a3489e8c77d2256c800b4572a4eced6e665b6f39e87879a8b2bbe751182eb5
font_02_sfnt_off00010d09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1