Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6c0cdec8d800531…

MALICIOUS

PDF

80.7 KB Created: 2021-09-14 11:22:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4a2e9921a02f7842ac87609a4ba3a9a1 SHA-1: a7c7c7e1f1d1835bdf3b8e2ba2dd7557a01e7eb9 SHA-256: e6c0cdec8d8005319a8a4de24382db8f631dac1ae8de065124e81d5216fa2ab0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The numerous embedded URLs suggest it functions as a link farm, likely intended to redirect users to phishing sites or download further malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports its role in distributing malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crysiq.ru/uplcv?utm_term=rupaul%27s+drag+race+all+stars+6+episode+3+watch+online PDF link annotation
    • https://aldurra.ly/images-editeur/img/file/vobivoluwaxef.pdfIn PDF document text
    • https://inprovitperu.com/ckfinder/userfiles/files/65827702326.pdfIn PDF document text
    • http://elai.kz/upload/2021/09files/210908045045304565ebbhk.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/fdph5nsho5pbgb7f5b8v27m9m4/ruxejebunulitegefonazu.pdfIn PDF document text
    • http://hajnysport.cz/FCK_userfiles/file/75962112233.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613991b76b1b9---33115099987.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/gububusexevuxulomeri.pdfIn PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/zalurir.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346f6a4f340---genapanizimiwawipedotoziz.pdfIn PDF document text
    • https://konzolstudio.ro/uploaded_files/file/98573215057.pdfIn PDF document text
    • http://wx-bm.cn/upload/ckimg/files/202109022309001475.pdfIn PDF document text
    • http://graciaindoutama.com/kingkong/userfiles/files/67679984291.pdfIn PDF document text
    • https://girl0229960192.com/upload/users/files/66933384796.pdfIn PDF document text
    • http://essentielles-theater.de/UserFiles/File/86528753633.pdfIn PDF document text
    • https://tjp2-hotlink-j3t.com/contents/files/91010875267.pdfIn PDF document text
    • http://juncheng.tw/upload/files/3731129082.pdfIn PDF document text
    • https://bc2000.order-pro.com/ckfinder/userfiles/files/97983428538.pdfIn PDF document text
    • http://autovoda.ru/upload/files/zotarezuvokorulizexuxu.pdfIn PDF document text
    • http://kmconlinecme.com/userfiles/file/92691193597.pdfIn PDF document text
    • https://xn--lenachatka-57b.pl/uploaded/file/mexotufu.pdfIn PDF document text
    • http://proreferee.ru/uploads/ckfinder/files/17139422791.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/72837558484.pdfIn PDF document text
    • http://zkqzl.com/uploadfile/file///2021091222032380.pdfIn PDF document text
    • http://tolaniprojects.com/userfiles/file/figubojotabavofogaxajo.pdfIn PDF document text
    • http://www.larucheapain.fr/ljk/file/31951002047.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_off0000d2e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eafd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFD 11400 bytes
SHA-256: fa0dc351faf002fd7bd0981f2a18a37e9420acf76c116f82abe231fe25624681
font_02_sfnt_off000105bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BF 18000 bytes
SHA-256: c413bcdd6f3e86a2e0d7ec5306444878204a2fcab451edc5386b978ea056b074

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