Malicious PDF — malware analysis report

Static analysis result for SHA-256 d54137f2d39965ef…

MALICIOUS

PDF

84.4 KB Created: 2021-07-22 06:46:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 6ba9a0b2324535b93812150882368091 SHA-1: 3d5f82fe6c8323e1f031ea9306117021173ab3c9 SHA-256: d54137f2d39965efe89420db437ae7becfb813066b1791f5d0ef55508030b1d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a link farm designed to host malicious content. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The presence of these links suggests an attempt to lure users to external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608380717865e---wefarifekedomevijugi.pdf In PDF document text
    • http://armanetti.com/images/sezenonogor.pdfIn PDF document text
    • http://jpmoto.biz/upload_picture/33094516654.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/88638619450.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/65692362115.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1606f51ed4727b---7265736418.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb3a9734dc---gokepuwujoxebunudovizor.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/pelokiwiponimerafup.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/megexogokupigef.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/df307a696b64d6b6f2f3684e4f6c2137/lijibu.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/sebemakomolopela.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/79784865319.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/83721334894.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a9baf4b2912---32292175626.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d4e8ac178---davawuluforebanukofagum.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/0pqdo30jfn4kbtlgab9nonnb41/75284141854.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/1c5d27302bdc1d99b1140475968a6365/8593146744.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/kisafu.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094590ceeffa---zinojufekuvexunivoberabi.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/3p7nj5jdrlojersq7tsk8s93lt/kenamoriwesawavegiwoxevit.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/35540630591.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/fupixadopiponek.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb6b802b5d---jawike.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/suxumikojebibexasa.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/882e79c7a0a048d5d03856c90bc0028f/26217871486.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=lord+krishna+names+starting+with+sPDF 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_off0000e95d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95D 10784 bytes
SHA-256: 34fdb107da323393278e983b9a142e3de819a25489ae047fb65f3da6eb0f093a
font_01_sfnt_off000101d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D7 16304 bytes
SHA-256: 06bef7529e2c1c4229fea82ac98dc5aac5d8c982b8fe3f46fb33b56a9eab7149
font_02_sfnt_off00012bf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1