Malicious PDF — malware analysis report

Static analysis result for SHA-256 14ac60b8fbc69cf8…

MALICIOUS

PDF

73.1 KB Created: 2021-09-14 06:08:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e999264ec395046bf52d66d48ea274bb SHA-1: 7256a0ca55828aaf130cd753c90f2374e1f9e563 SHA-256: 14ac60b8fbc69cf89d5b97bd71ca8a9edaaf52cfed2e8685a03a443652312816
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://edusfera.pl/upload/file/jufafuwewejuzidanusidedeb.pdf In PDF document text
    • http://jmyhship.com/uploadfile/files/bakitaw.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/pibunulexovewir.pdfIn PDF document text
    • https://dmshospital.com/mm_engg/files/87061115016.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613923ddb245d---39810366215.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/boderorazapamigodaxomon.pdfIn PDF document text
    • http://neoneofytou.com/ckfinder/userfiles/files/6069977359.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe706dc9a7---12939539135.pdfIn PDF document text
    • http://damnoen.com/ckfinder/pho/files/35767742068.pdfIn PDF document text
    • https://alwaysthesame.pt/site/upload/file/gopozuleraleluzu.pdfIn PDF document text
    • https://yptea.com/data/fckeditor/files/83131730282.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16136f9e267eeb---77683573212.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/7123014f17535fc621cca13943e4669c/21734618945.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/nujazefug.pdfIn PDF document text
    • http://aolisenjiancai.com/data/files/16944396392.pdfIn PDF document text
    • http://queensparkview.com/image/upload/File/tomawumoso.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210910_184914.pdfIn PDF document text
    • http://szguilong.com/userfiles/files/gerotusi.pdfIn PDF document text
    • http://www.yankey.com.tw/demo/public/editor/ckfinder/upload/user_upload/files/ropix.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/161315adadb345---46028001329.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/161371e2cc439c---38480995953.pdfIn PDF document text
    • http://cherryontop.pl/upload/fotki/file/14557405736.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/gekemipiruwikos.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c37038d951---xuzev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=santiago+city+postal+codePDF 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_off0000baa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAA9 10780 bytes
SHA-256: cf41ffcd34f923a1db038ceaa99b819cb6774a81a4819205d36ddce4f3b98699
font_01_sfnt_off0000d36b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD36B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7D 16840 bytes
SHA-256: dc2eac36bbb4d3a568ef0f760eb468a4d60bd617540021526efcd9439b539d46

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