Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e811769908f1873…

MALICIOUS

PDF

81.5 KB Created: 2021-08-30 02:29:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f24f1ae25137bc7ef3bc4403812a43a8 SHA-1: f249a78b62d9b4b3382ad03612d264923e844de0 SHA-256: 1e811769908f1873c4af907e253d85b8e6923d31845d604f435512cf92c28dce
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to various domains, many of which are hosted on compromised CMS upload storage or appear to be part of a link farm designed to redirect users. The primary function appears to be directing users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://aulacvn.com/upload/fck/file/56935988145.pdf In PDF document text
    • http://waltwhitman1964grads.com/clients/6/6c/6c9ae932573016e5ff31759a10dce4b4/File/sonirunew.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/69536250645.pdfIn PDF document text
    • http://prosquash.by/data/61239153992.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/76a6b008fb205f70fec4e963a07a077a/jujikadidubaw.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/wopave.pdfIn PDF document text
    • http://chikatere.com/Upload/files/12396056566.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/zitemosarilular.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f2cb0dd6914---54478637770.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/kuvivexebafajotigenote.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/89481776547.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/d2db5fa9e9ab25bd563d2078c93f7890/vonijobazuf.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/11251650153.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16083e7832c1dd---nilaguxape.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/momalutazo.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/jikorofazikirafof.pdfIn PDF document text
    • http://giustizianuova.it/userfiles/file/savaliwomanujir.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name//files/ludinu.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16081a54ba0909---1406211159.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/xuselipuwober.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/16267418532.pdfIn PDF document text
    • http://beulahcooleycollection.com/clients/870349/File/gilibafanodidez.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080285fc8faa---kizewoxatojulovo.pdfIn PDF document text
    • http://tlproduct.com/userfiles/file/mugikofexinolakuja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=check+road+worthiness+certificatePDF 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_off0000d714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD714 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF26 18212 bytes
SHA-256: 19273c7b1d530211c3a790462ee188d876646bd70edc520b4549419916eb9bea
font_02_sfnt_off00011e0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0C 10736 bytes
SHA-256: 209eeac4d92a42407bdf6f4ec7bf9a5129a58da2a0992b3583cb98cce3c7088f

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