Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffd1b28e6d705474…

MALICIOUS

PDF

90.1 KB Created: 2021-07-03 05:25:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1117f84a65522951f12016c1bdcbf41e SHA-1: ef317eb7537cb1bf0be0e465612e109e5481b776 SHA-256: ffd1b28e6d705474935c07628a169faee5e88b666c46478ef18bddbfde91741e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a phishing or credential harvesting attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://irlanc.ru/uplcv?utm_term=word+to+image+creator PDF link annotation
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/amu6i731f06bmk0eh2fi3jftj2/13387833747.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c0428fc338f---43937042807.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/vibamowexiviruto.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/xepamusarurupemapevoparip.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/1938541507.pdfIn PDF document text
    • http://gptools.net/userfiles/file/faturaxapuramofumumilu.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b03ea49dc19---tifaw.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf29f8228b7---razokegutoboguwevafovos.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/90075896164.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16085a54527761---pibusejatorofega.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfb50223f27---wapojetojomevobi.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/a58142dabbf9f5f1c99648006406a5cc/xibovizemipuw.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/dagewiresatifulubefareruw.pdfIn PDF document text
    • https://babamore.com/upload/ckfinder_temp/files/20210614204231.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acbd427fa62---69539501923.pdfIn PDF document text
    • http://dgjst.com/upfile/file/15796274317.pdfIn PDF document text
    • https://afayl.com/userfiles/file/63791254729.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/2092305329.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/jgc55jae2kerrc7fjsvhnkr792/56922718840.pdfIn PDF document text
    • http://islandpointfl.com/userimages/94155080966.pdfIn PDF document text
    • http://vdtonline.vn/static/uploads/editor/files/24973269856.pdfIn PDF document text
    • https://unserbiokorb.ch/userfiles/file/mutaweladojapimozilov.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e85f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10076 10388 bytes
SHA-256: 31b15ec73794b0a8e65aa947cb3b50749d541b92754734fca4fb880e8bb4f56b
font_02_sfnt_off000117c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C4 17584 bytes
SHA-256: 7934abc6f8952054e1ca942c012e8b3356fa9efe6c8ae7d68c1ef79d3d96842a
font_03_sfnt_off000145bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145BF 16076 bytes
SHA-256: a671d37c7b3b889284622d243fc9727f378cc914a66da79eb58e164c6b93b0ed

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