Malicious PDF — malware analysis report

Static analysis result for SHA-256 45124a75c77d020f…

MALICIOUS

PDF

79.7 KB Created: 2021-09-07 00:29:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ba2736822c9f1d08d434315374002413 SHA-1: 695320c731efc69eec778b75eb94a9c3aec9d65b SHA-256: 45124a75c77d020f53e9c2450a3e5e92a2e6c8cc378bb4ae65711c94a8bd4df8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to numerous other PDF files hosted on various domains, many of which are identified as potentially compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://lapakunited.com/contents//files/18742871958.pdf In PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/jisemixopizuxoru.pdfIn PDF document text
    • http://wohingltd.com/userfiles/85722540127.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/pejilegalev.pdfIn PDF document text
    • http://ipea.kr/userData/board/file/vawudisaledolibiketuke.pdfIn PDF document text
    • http://gcsiva.com/files/userfiles/file/10227663429.pdfIn PDF document text
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/t5dud4dtotg5ggsonm98i27jlq/vurozabuku.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b412692f7f---76011250621.pdfIn PDF document text
    • http://autolubitel-irk.ru/userfiles/file/worodakoje.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/2u19nu77nffjq80uv21ran1tl0/bawatedodipibegafopoxu.pdfIn PDF document text
    • https://medpressa.ru/files/file/duledijemeviteze.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/89884493654.pdfIn PDF document text
    • http://lionsmarsala.it/userfiles/files/82409462261.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd0ea8a956---43357009324.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/72012d2b59d3cc6dc5aa30ce4ccb858e/rosiro.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160976ca02f658---26692584500.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/40695230736.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/7785131717.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c6c25453e---jirurulelefugugotebijopal.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160782448a24a5---rufuxetop.pdfIn PDF document text
    • http://hangnhatbanonline.com/upload/files/jaxavuvolibuta.pdfIn PDF document text
    • http://stillincontact.com/images/mails/file/13837587872.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=photodiode+amplifiers+op+amp+solutions+by+jerald+graeme+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000deed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEED 20276 bytes
SHA-256: e81a4a5b8a80bb85660d62be2289d7b62c8fcc80ac1d6f59d6677b19c4930699
font_02_sfnt_off000114c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C7 11432 bytes
SHA-256: 2bc0909d57b0aa60f5cb9121d3e4c19b9d536adc9b0266a49932139713ad4806

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