Malicious PDF — malware analysis report

Static analysis result for SHA-256 91ecce75c4db4eaa…

MALICIOUS

PDF

92.0 KB Created: 2021-09-17 03:41:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ef1acfda1299534cfe31ddb1afcec89d SHA-1: 9803b3ebb5d24c9eadbad771dd369047db9d9bf0 SHA-256: 91ecce75c4db4eaa6351d2b663f2c77d9790b8b0b9832c15eb93891e4258b4ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were extracted, the structure and URL patterns are indicative of a phishing or redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/d6033649356f46ce69382e1f43005bb5/babisemaruluwazuwobalaba.pdf In PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/boxenutarov.pdfIn PDF document text
    • http://odessawa.com/userfiles/file/marebemoxoxiginuz.pdfIn PDF document text
    • https://www.willmarareachamber.com/ckfinder/userfiles/files/fewafadalebetokotureboz.pdfIn PDF document text
    • http://tlumacz-bialystok.pl/pliki/file/givobosupaxaloxi.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/fasixamufelebore.pdfIn PDF document text
    • https://edgecs.com/documents/rejowa.pdfIn PDF document text
    • https://pankajplast.com/ckfinder/userfiles/files/zavanatapi.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613719962c143---piwun.pdfIn PDF document text
    • http://nhatrangpalacehotel.com/app/webroot/upload/files/lekexexipovivizavasifun.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/userfiles/fichiers/49560103961.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613f0676ac892---vuwijil.pdfIn PDF document text
    • https://callmarkinvestments.fortunekenya.com/callmark/files/30053723529.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/tufususasevimo.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/161360db6645b8---nabunibedosetamujalusagiw.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/l4d0f77k4hpcv8oipkno371l2u/detek.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/89674133588.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/fanasoxotatumugokowadujaz.pdfIn PDF document text
    • https://nidi.mk/ckfinder/userfiles/files/xemefevotuzoruwewodin.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/pogixurunapefopuzalelo.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/58687241078.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/47361010899.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161412224bac7a---manotirabuxonom.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1614318c5574b8---11961135050.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/mojakatepejokijaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=%C3%A9l%C5%91+h%C3%A1tt%C3%A9rk%C3%A9pek+androidra+let%C3%B6lt%C3%A9s+ingyenPDF 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_off0000e2ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EC 11580 bytes
SHA-256: c727c7e2e3a85063214493451ec5b88c61afe2154178548bb98fe2450bf1871c
font_01_sfnt_off0000fcd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E1 17036 bytes
SHA-256: a0c77d14ca1f6956bed5fb1cae73a935ca1d948738dc61f0b6f9612ae193b6fe
font_03_sfnt_off00012db4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB4 19752 bytes
SHA-256: 75cf52381d4b8080f5e4f3052be7206b67c7909204aadd9495aa727cf4f2d227

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