Malicious PDF — malware analysis report

Static analysis result for SHA-256 3356981d0230cd93…

MALICIOUS

PDF

83.8 KB Created: 2021-09-08 21:52:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9af54da081488ae4176f0d08e4571bd8 SHA-1: f3e73d59a10a6c49ddafadcf55bf44f901f3bdb7 SHA-256: 3356981d0230cd93cbfc2ec6694c3b02d8a12f452bf919a28a71e748c8fa002a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple compromised or disposable hosting sites, indicating an attempt to obscure the final malicious destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://driver-jazda.pl/upload/file/57267563293.pdf In PDF document text
    • http://fotografieindex.nl/images/uploads/nagajuzuguluvegopin.pdfIn PDF document text
    • http://checopharma.com/upload/files/61855094738.pdfIn PDF document text
    • https://molecult.metallo-tests.ch/sites/web/upload/files/genijikifusagis.pdfIn PDF document text
    • http://rideco.hu/upload/file/vumaxorifarojupukavo.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16135579645af5---fonigilariluxadetopagal.pdfIn PDF document text
    • http://hoanggiaphatstone.com/upload/files/fojusitixufomuwer.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/muvaxo.pdfIn PDF document text
    • http://tianfonmm.com/d/files/kokanonineg.pdfIn PDF document text
    • https://bhavanarayanaswamy.org/userfiles/file/jivogerogojilebadilo.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/wewuvupawetixugi.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/fc2290ce79adc82eb1d8bc9d5ead75ff/pakuseru.pdfIn PDF document text
    • http://boldogelet.hu/media/pavarewawexanefozop.pdfIn PDF document text
    • http://www.ville-civaux.fr/admin/js/ckfinder/userfiles/files/sagedalasarefevifepat.pdfIn PDF document text
    • http://yujinpharma.com/upload/files/89676017599.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/93604091801.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/67966317467.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613602c9947f3---wilag.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/35439064602.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161360f9bc0dca---zerenupinaxix.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/kovonisazomube.pdfIn PDF document text
    • http://peoplefoster.com/pliki/72163561370.pdfIn PDF document text
    • http://turatabor.hu/media/68896025278.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=in+time+movie+watch+online+with+english+subtitlesPDF 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_off0000dff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF1 18204 bytes
SHA-256: c00f727fb994009dd9e6879cbac9c36ee55aa1404f09628f3ba1de4745f3321f
font_01_sfnt_off00010f89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A0 10920 bytes
SHA-256: 0bc4bff8d038fb8bde3fc7146af7e29bd6732cfe3585954a08ed868029b0b186

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