Malicious PDF — malware analysis report

Static analysis result for SHA-256 882c3b02503535a4…

MALICIOUS

PDF

72.1 KB Created: 2021-09-28 13:00:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 55af3afad0eda4baff6c7775a2e46c33 SHA-1: b8d7ca020741a17ffbf48b7ce03dd65e605d0ffa SHA-256: 882c3b02503535a429709247f890943678bcfda30865a5a621672201f1ad5a90
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple unknown URLs hosted on potentially compromised or disposable domains. The document's structure and embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://world-green-hope.com/uploads/files/babixufiwo.pdf In PDF document text
    • http://mirai-kankyo.com/userfiles/files/fufumubol.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/xegirosobipabumimepezub.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/rabopurulinaxatisozuxul.pdfIn PDF document text
    • http://tianlanip.com/filespath/files/20210905070834.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16133cf0a01cd5---wewanuvaxe.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/motarenujeledabiwitusev.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/161316a390393e---turijatuwenemuwi.pdfIn PDF document text
    • http://wiskind.com/filespath/files/20210918094636.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/jefazom.pdfIn PDF document text
    • https://ermolino.mebel18.com/uploads/files/baxubunugazabizetafeva.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/norumogokiwemetaxubofunag.pdfIn PDF document text
    • https://bwhe.in/ckfinder/userfiles/files/pogafirab.pdfIn PDF document text
    • https://mattress-leader.com/media/xosakevojiburezulajajan.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ed9a930b6---51057354481.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161410e09d3727---tetipewekago.pdfIn PDF document text
    • http://www.wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/lubejitejejipakawowapo.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/runevasakuwonigalexofa.pdfIn PDF document text
    • http://likuidart.com/files/ckeditor/files/85236375366.pdfIn PDF document text
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/27013065534.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/63325051937.pdfIn PDF document text
    • http://tottazo.com/userfiles/file/53572359502.pdfIn PDF document text
    • https://asiahealth.standrewsdentalsurgeons.com/ckfinder/userfiles/files/vukagakevuxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=android+text+font+sizePDF 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_off0000b6fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6FA 17456 bytes
SHA-256: 7f0d8967f061d228dfae2a069e3b51984a25ed38bdce13e8f617837ca7c500c8
font_01_sfnt_off0000e360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE360 10284 bytes
SHA-256: 829dbce84f92bff74e077ac773964ac7e59e4971723a3dc7200555cc6bed3444
font_02_sfnt_off0000fab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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