Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6117722f8a31be0…

MALICIOUS

PDF

74.4 KB Created: 2021-09-19 14:51:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4f344f53e603d8470bcfe58bbd0fc746 SHA-1: 20aee20afda774a28fb5ed7ad4b8e0348517998a SHA-256: d6117722f8a31be0fef5072b613f88cbac8eb5b09f04c49e8107c843353dde9b
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous unknown URLs, many hosted on disposable domains, suggesting an attempt to distribute malicious content or phish users. The presence of multiple PDF link farm heuristics indicates a deliberate effort to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://cauthangdep24h.com/upload/files/jurodabesedebunodupezebip.pdf In PDF document text
    • http://gloria-eurex.com/images/blog/file/86805066309.pdfIn PDF document text
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/wojuf.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/94540709734.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210912042249134.pdfIn PDF document text
    • http://vers-ma.de/userfiles/file/67116961613.pdfIn PDF document text
    • http://midesignvn.com/uploads/files/88421724538.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/zodemiwefujinodavelunepaz.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/99ff828809dfe9d04fa2bcba9ab01971/95410190522.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/9033616674.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/bujuxuxubazixojen.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130af6d0bdec---xitaxugemimimedit.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16146f459644e7---sujosekujanifubixijekuxim.pdfIn PDF document text
    • http://123flower.doweb.kr/upload/files/12119894632.pdfIn PDF document text
    • http://upasamed.org/Content/uploads/files/2405998530.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/57156836209.pdfIn PDF document text
    • https://thepainter.asia/upload/files/23288818171.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/xazoxukinisosofunudibate.pdfIn PDF document text
    • https://csmgh.net/pevron/www/img/file/91917477915.pdfIn PDF document text
    • http://malovanesklomh.cz/images/file/ridefaxufajanejomap.pdfIn PDF document text
    • http://sjanzee.nl/file/gatoxatopi.pdfIn PDF document text
    • http://www.moyekolodin.com/files/nakugulababol.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/62655346351.pdfIn PDF document text
    • http://china-spec.ru/userfiles/file/5577081428.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613661b715d9b---kipubefosetodejetevukusiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=little+big+planet+rom+pspPDF 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_off0000bc5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD475 10692 bytes
SHA-256: 8ac29c774f8bed17f446e29b1986d8703a5f699d49f5ca956f8063c48a6f0b79
font_02_sfnt_off0000ecb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB6 18580 bytes
SHA-256: 9cc0b25da2adafd46f23addfc2ba0bc744d7eaa34bae5837183f2e282eba5f51