Malicious PDF — malware analysis report

Static analysis result for SHA-256 97599422c848b0cb…

MALICIOUS

PDF

88.2 KB Created: 2021-08-13 08:16:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5e1a5cd657d3154fa85c9c181ce7bd59 SHA-1: 7a866674b2c35620109dcdf347801ca0dfac6806 SHA-256: 97599422c848b0cb50ad6fb620d018253350ffad464c39af7a4f6a52bfbd60d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm for phishing or malware distribution. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e201d02a4---dimifaturafazasutomixot.pdf In PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/shcriorcinfo6t46om7m9fvpip/webugoma.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a5837c4d0b7---jomasoxeduvulunaj.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/14305172433.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/e472e6314c0eb9a3215c0d4b77f3e9dc/posapemepegasi.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160adc053951c1---57249981659.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b5acc6720f4---jexinejinuxagutugaxemonom.pdfIn PDF document text
    • https://ngonluathan.vn/images/ckeditor/files/mopemesirisiditajag.pdfIn PDF document text
    • http://kubkao-kubpla.com/userfiles/files/40529404636.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/a8ba42e69ad75e7080687f0d46a77308/30066342756.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/videsidobebi.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/o5uhl9cnncmigek6gm3vqqp2ak/pites.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/35f310912b327398124dbb3db1ebe957/pixadome.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085283ce8cf6---fuzij.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/68721492374.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d4b7bcc57bf---jijubasisozivaxetar.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/7b53c19cb70d7c06fbfd5dada9e221d7/zadanebogiligalubuvokifu.pdfIn PDF document text
    • https://mkontakt.pl/dat//file/43788647403.pdfIn PDF document text
    • http://dlzj.net/upload/files/2021071317351196427.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/4411093760.pdfIn PDF document text
    • https://parfumzone.ro/files/file/faweja.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/mujejajoxuzanila.pdfIn PDF document text
    • http://mobitransjogja.com/files/751437142.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name//files/43532804361.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=sample+information+system+audit+report+icaiPDF 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_off0000f575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF575 16920 bytes
SHA-256: 38b8ffb910091088658b112f3373bb19ae029fb4a6abca8e42a1aad941a41316
font_01_sfnt_off00012169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12169 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13980 11068 bytes
SHA-256: 512f1aa6591180f83449c9517f0414b3295586355d9a1675559af0dcdb733734

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