Malicious PDF — malware analysis report

Static analysis result for SHA-256 a024427b37de7775…

MALICIOUS

PDF

79.8 KB Created: 2021-08-26 07:25:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1496e68fe4b933b8d988957125ee2763 SHA-1: be2c4e66ad4e046db60eb763816d5b5105797380 SHA-256: a024427b37de777576640209ed890894f3b8c871fce91b8e8565533da58f7662
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm with multiple URLs hosted on potentially compromised CMS uploads or disposable domains. The document body is heavily obfuscated, preventing analysis of its direct content, but the presence of numerous links suggests a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://eaeocs.com/clients/c/c7/c75ed17bfa54634cfc1039f1b599a7e7/File/dogolewabotirupubifepira.pdf In PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607796d165c02---82941203434.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087ab029d7ce---takabowuwir.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/30047e54c54e4fd98f69df4a12cce9cd/22713418426.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/jorate.pdfIn PDF document text
    • http://location-venise.com/italie_documents/files/jafutoworowetijusugomofe.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16090674806a0d---80846023649.pdfIn PDF document text
    • http://shiokuda1.com/contents/files/vinijogevirogeg.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609235c063180---lakanegud.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/44679471177.pdfIn PDF document text
    • http://www.veslovani-vsb.cz/soubory/file/63137628409.pdfIn PDF document text
    • http://fotomil.pl/ckfinder/userfiles/files/rukumifuwedolazalamirulu.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e1e755ef4---77785154529.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/vovumamotunole.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/efa3892aae0e717bce86b3b3a82d0347/16657635538.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/67163194424.pdfIn PDF document text
    • http://edison76.com/clients/5/54/54c13950cbd15a81e6fb4362eab8f273/File/3894812604.pdfIn PDF document text
    • https://arendic.cl/files/91732994094.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/fasozavomufatomovuja.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/pamozazotewidatugafuk.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16089c1087c51a---5701509037.pdfIn PDF document text
    • https://anfauglir.com/images/file/kufizodawawekijat.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/zejogemaresipupokixebi.pdfIn PDF document text
    • http://allasclub.com/campannas/file/73039486342.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=two+types+of+grasslandPDF 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_off0000d7d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE7 10744 bytes
SHA-256: 5bb8057431500b5c37767bc855698c3ab0a90b826d350e62536d6f5df1523586
font_02_sfnt_off000108ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AB 16064 bytes
SHA-256: ffe39a581f2e5ac7eb7de64c310481aca9f7e53dbc06675b596a2b89fb1bedb6