Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf15bc29b358a5da…

MALICIOUS

PDF

74.4 KB Created: 2021-09-06 08:27:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8be31655f0b2a9ad1e9f3a079c6df452 SHA-1: b1d5224e6781b1b36fc7e06b9f273632f89fc3aa SHA-256: bf15bc29b358a5da4fc514e211a5f82ea2a7df29af0df2c846f13ceaa8ce9e2d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a link farm intended to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malware delivery or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f37ad31f57---97826328794.pdf In PDF document text
    • http://freeski.hu/freeski/file/visibilivijowuzutobuw.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd450f7cc15---xugewolesa.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/kuzalixizevobomesolugo.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/tidojurogemobeb.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/53195393963.pdfIn PDF document text
    • http://teresachild.com/upload/files/wisazexunezut.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/12424373084.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e249506dd7c---boxemiwiruzemowofeve.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160afa2c184100---63965725340.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/7253144075.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4d9a67533---nexubuzebinefezewe.pdfIn PDF document text
    • https://micsys.in/userfiles/file/44162758767.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/e625d37b98e8d40e3bdba70aac3b59e2/21595546840.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609832591c579---rusomekapapupumiv.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/dutejadobapasokagetosogu.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/42722016080.pdfIn PDF document text
    • https://pannonfinanz.eu/editor_up/jujomezixixavagoguxowev.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/0faa16c8a981d7399b2fe5e3bd92b662/55810449297.pdfIn PDF document text
    • https://extremedriveline.com/ckfinder/userfiles/files/kodisepidimakajujafe.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/88563315359.pdfIn PDF document text
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/12791308938.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/tukomizipisugatomaseginuf.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/jomemubidivixoribijop.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/99202777554.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/63720592651.pdfIn PDF document text
    • https://invest.pl/userfiles/file/84230321304.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=polynomial+worksheet+docPDF 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_off0000bdf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDF9 10928 bytes
SHA-256: 92a158b3f70fec2c10102c50d8a824ed84cd1de6f2d0514d57b36c81fc45c5c9
font_01_sfnt_off0000d72a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72A 17184 bytes
SHA-256: f56169ba0104a4ef4c7ec8b3676b5d57d83c0ab3d29532f86f32930684dd82d5
font_02_sfnt_off00010365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10365 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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