Malicious PDF — malware analysis report

Static analysis result for SHA-256 f28c30b14b4e3cde…

MALICIOUS

PDF

83.4 KB Created: 2021-09-19 15:43:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3ef1736423b36f25fbcfd7d886d436b9 SHA-1: 17c64c49720f16692b3ed48748f6e68744c10564 SHA-256: f28c30b14b4e3cde6baedcdee5c80e712db4c3b6eec37e1c614cbfa60d7ac6e9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or download of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://digilit.ir/basefile/digilitir/files/16510218018.pdf In PDF document text
    • http://weddingdove.tw/uploads/files/202109091905536821.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161380e51d0be2---32684172274.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/37005305648.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/81071313967.pdfIn PDF document text
    • http://celeb.huh.hu/UserFiles/File/levimob.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/6c4e0481283c0ffd9c79748f66af56a5/48820206167.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd7aa545c4---43283470576.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/59184618302.pdfIn PDF document text
    • http://mrukseo.pl/userfiles/file/soxali.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/52777145094.pdfIn PDF document text
    • http://wimborst-ceramics.nl/ckeditor/ckfinder/userfiles/files/rigizazosapupari.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/lutupoloje.pdfIn PDF document text
    • https://e-fasteners.eu/media/file/nawamojukidewesuk.pdfIn PDF document text
    • http://www.onlinenieuwsbriefversturen.nl/gebruikers/afbeeldingen/9573472840.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/22589114677.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/81964851535.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16137dcfa50498---63045760716.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6de3a1208---fegujodafabekorizelox.pdfIn PDF document text
    • http://alpes-maritimes.proximeo.com/ckfinder/userfiles/files/rimupozolegas.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210914150110.pdfIn PDF document text
    • http://discus-rus.ru/upl/file/21500376174.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16141e5375b772---tukizub.pdfIn PDF document text
    • http://xn--krmer-dnnebacke-1kb72b.de/files/file/97572273379.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/jofozubirovafaxo.pdfIn PDF document text
    • http://cjmfgxfollow.morefriendship.com/upload/files/rogiwikanagowuvasido.pdfIn PDF document text
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles/files/32932018810.pdfIn PDF document text
    • https://madame-tina.com/ckfinder/userfiles/files/27991400555.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=grammar+builder+and+reference+solutions+intermediate+keyPDF 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_off0000db9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9F 18852 bytes
SHA-256: 305a7ceaf65f9d8f5182c5b7923fc755b1aa41a5ab257db9d001f32cb0b88816
font_01_sfnt_off00010d0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12523 11124 bytes
SHA-256: 19be5a1af7adc3b3a9e2a30b1f42c17a9b8d0db5edfb7b08c1622cccea9e40c5

Open this report in the interactive analyzer, or submit your own file for analysis.