Malicious PDF — malware analysis report

Static analysis result for SHA-256 0df4e79191c935a8…

MALICIOUS

PDF

92.1 KB Created: 2021-07-05 03:54:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cdd797d9a926059216a96eb1d32d1ecb SHA-1: d948dd6a6e22a41b2ad88a6e62fcb4f1975d4e43 SHA-256: 0df4e79191c935a86246b1c4f35d8c99a9cddb5e5eb24df290a63ff78a5a02f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The presence of multiple external URIs and the link farm structure suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://mdbim.pl/ubezpiecz/obrazy/file/pukapusakesadifujotazil.pdf In PDF document text
    • http://szkolka-wiercioch.pl/files/file/65872522870.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/88004464586.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/ea2c58c7606d4851e9a4ca47d3022bdd/53830423704.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/mogiludijuvakoraweva.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/10909ed3669a3143851ef825fc31d3ad/63112961807.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be4f0d5171e---62202544098.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/i4ionr4tb6ieqm5qlggb2a7pta/nofatomixegirobibiguxol.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16096751fe18b0---pasawurerevipoxexeju.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a2a123534.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/48874275237.pdfIn PDF document text
    • https://sambelteri.com/contents//files/52626900906.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/71204778091.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b18168a335d---29194689967.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/nuleduxojudorabex.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/52273544207.pdfIn PDF document text
    • http://cosmickino.ru/sadm_files/47299291021.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/b363da7efc7b91f0b828f76471dc7fe9/80870504324.pdfIn PDF document text
    • https://praward.tw/wp-content/plugins/super-forms/uploads/php/files/4e9c60da1245bb784817b393b12cd1a5/34571343241.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/usfogc92bmuunka486k67bfnru/32346925921.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608440230c9e2---56666736645.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/bomokivuputavezovos.pdfIn PDF document text
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/novebakirovoweg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=grease+equivalent+chart+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9C 10948 bytes
SHA-256: 38eb13cc60e20eb97e08d4e97afc85bb518171bf535227426b48a1287f6c73f8
font_01_sfnt_off000107b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC6 16232 bytes
SHA-256: bf3ac2bbc5511ca59b022801f68684aa2b8ae7661b1a55c6866fed5ae8d27d0d
font_03_sfnt_off000135a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135A4 17136 bytes
SHA-256: 894e45d808aef63b2200e65f964dfde03fa096131a420fa31fe1e48969ac67e2

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