Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b14a2a2a45df1ca…

MALICIOUS

PDF

71.5 KB Created: 2021-10-04 13:38:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1a02bca413a497040dddaa64f25d3241 SHA-1: 59d8939b0dffe19c65a09f4482399b3fe26f6fc5 SHA-256: 1b14a2a2a45df1ca8819ea152a0e5b74150be86f57d753b22614ea5c92475d55
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Several heuristics indicate the PDF is part of a link farm, directing users to potentially compromised websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • 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 https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408b503b5aa---zunimutedojokezaxelugi.pdf In PDF document text
    • http://progfin.pl/userfiles/file/89500777052.pdfIn PDF document text
    • https://ozsersogutma.com/upload/files/7304060371.pdfIn PDF document text
    • https://calienglish.com/ckfinder/images_store/files/topibesavarofesudigipetig.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210928_5D8C7476EDC79057.pdfIn PDF document text
    • https://btegypt.com/file/9353314274.pdfIn PDF document text
    • http://www.mattig-accounting.bg/fisiere/file/nubalunagawubow.pdfIn PDF document text
    • http://infosierra.es/images/editor/6535859454.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/40856062304.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/9ibqdrg5gj3trd9m0kpd9lvrif/53909190571.pdfIn PDF document text
    • http://tanabuauto.com/js/upload/files/89803067717.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/ranuxefenodogatefino.pdfIn PDF document text
    • http://hadt.vn/upload/files/77074164569.pdfIn PDF document text
    • http://2990592.ru/ckfinder/userfiles/files/gidul.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/zinoj.pdfIn PDF document text
    • https://pima-alarms.eu/slicice/file/punajazixekegugogul.pdfIn PDF document text
    • https://ist-lb1.istanajp.com/contents/files/652832965.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/b24b207edc246b0830b3432870336569/83572070549.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/sodusuzinoxanidonur.pdfIn PDF document text
    • http://fatfailogistics.com/fckeditor/files/file/lolujowiw.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1615a570c49894---lunaremiteseveka.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/pixogenipisoxemegogopife.pdfIn PDF document text
    • http://obuchenie.bititechnika.com/img/file/zopimuleni.pdfIn PDF document text
    • http://saaretravel.ee/images/file/mijowusijugebut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=gas+prices+by+month+and+yearPDF 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_off0000b5f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5F5 16352 bytes
SHA-256: 6cabd829f0a549721089b2e60ff659006485759811dd1f3551d6f7c3adc2724d
font_01_sfnt_off0000df5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF776 11028 bytes
SHA-256: 3e09884b18a1b7ea6ee130fd48142afab4dbbce59311cc972afe84ee77f57a6d