Malicious PDF — malware analysis report

Static analysis result for SHA-256 e33024b35683cc5f…

MALICIOUS

PDF

69.8 KB Created: 2021-09-07 19:32:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d590869d228b884389325e4a2ebfe6a5 SHA-1: 630081c570761a64a32378b01af14c255d424d8a SHA-256: e33024b35683cc5f3090d15c35fc69a0528452c013d9c382f992236cd3321171
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these external URLs. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://inwebjor.ru/uplcv?utm_term=libro+sabiduria+de+salomon+pdf PDF link annotation
    • http://poltinik.ru/userfiles/file/10010580397.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/dumulagedujofatutugas.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1520d7beb0---vijakelap.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/9ca874d1b1572ebcdfcefd3a15a101fd/54864954551.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/tararovubixufe.pdfIn PDF document text
    • http://alacarte-grafik.de/userfiles/file/lotozaferi.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/6d57e719bfef8f06616af0e40a4b5b0c/pilivojupawifupisonezer.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/rolifuwumowib.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160740b4b51de6---ruxukatujinufij.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d146e3bada.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/ff9103ee9656a39f8b968f2e144e085b/fobesebazovedalepuguw.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/896f2659740f1424a1876ee446d66b84/xuvugugijarokaxaranijare.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/f34888c6602cdd46a41e99f0eb9c0691/gebuzexexogetajusosizuzu.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/83n9rgbduqekgnin3er3quf316/34049287390.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/guwetovemotudufigozu.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2784d10cc---podeverezinom.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c494b3e83a6---7215576163.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/ij0jlps8f01nrh3or3v73u48a4/21578562679.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/gununesesejamedobaxovogo.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/81044110754.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/d4debf74adf4bb5b091b3d11dc0c8695/kadiduxovodaralelol.pdfIn PDF document text
    • http://ilovechardonnayhills.com/userimages/niluvemekixeziloteximin.pdfIn PDF document text
    • https://www.rougeindigo.com/ckfinder/userfiles/files/59670703112.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/bumemojo.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/77673112388.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_off0000b3d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3D0 14904 bytes
SHA-256: 28cdba2bbdb7110b0fcb3b27b09e65fd20385f5081486a0970353784b001f813
font_01_sfnt_off0000d928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD928 10756 bytes
SHA-256: b58b0306c61de7b8fe932372879891b07186b898d5afdf486b2cd2f6b6a2a1d1
font_02_sfnt_off0000f19b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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