Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff084cd45badc323…

MALICIOUS

PDF

86.6 KB Created: 2021-09-03 17:19:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2b1f25e9bed76c095b468a91eb548a7a SHA-1: 0bf1be9d709a46ec6c73656d9bc7858d669aadef SHA-256: ff084cd45badc323f6e3d2050d18a3dd20581746309879bf485969c57c277860
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to phishing pages or download further malicious content. No scripts were extracted, but the PDF structure and embedded URLs are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=change+management+kotter+8+steps+pdf PDF link annotation
    • http://szentimresiklos.hu/upload/file/kotifumexapufuxekirero.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1b36c2144---jotekixadesijuf.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/de12485f3fdd5a91fa6fbf1dafff0d1a/nurofat.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607da2ba089c2---guvojer.pdfIn PDF document text
    • http://whs1979.net/clients/65916/File/tafita.pdfIn PDF document text
    • http://balcimimarlik.com/resimler/files/88158864365.pdfIn PDF document text
    • http://usmleworkout.com/files/file/69460895810.pdfIn PDF document text
    • https://kompaspt1.com/contents//files/gonupetunubu.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2339a21c4---lomezowumejawofokamixone.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/vusifokokizoja.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/tibakirewolor.pdfIn PDF document text
    • https://yuktogel.com/contents/files/11669487942.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f225a5c4f---9319329523.pdfIn PDF document text
    • http://jingchengs.com/jingchengs/ckfinder/files/20210620090819.pdfIn PDF document text
    • http://email-database.info/userfiles/file/23825233222.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8c0bf2a01---50443005529.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b80e67ba13---26794408848.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/65699510994.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/9aefub0kv7a6cuprh8v5gkk8qh/53184377199.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/76558921030.pdfIn PDF document text
    • https://peiitw.com/Upload/ckeditor/files/34459603523.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/2ff9e3dd359d4344e2a370aeb195b88a/bonumonujumamodoxa.pdfIn PDF document text
    • 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_off0000ec4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4A 17872 bytes
SHA-256: 1151f6c2c27d0d8fecf888000ad54bb0e333233c7a1ae152d23165c994c957e6
font_01_sfnt_off00011b00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B00 11140 bytes
SHA-256: 84f6a7d09b145535541d026b28125120d1e29010a5e3889ca298abc2e88fd1d1
font_02_sfnt_off000134b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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