Malicious PDF — malware analysis report

Static analysis result for SHA-256 9956339f2af5c0ca…

MALICIOUS

PDF

77.5 KB Created: 2021-09-17 18:43:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2fe4d9c36b4c29fbfa586a3c62722f38 SHA-1: bfd9fcf2ab3d47879d2d4f0e25ef1163b2f9a680 SHA-256: 9956339f2af5c0ca447f3f2e5e9da4a4d77a8cca2acaabaa5d979324295bcd8c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URLs point towards a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://pixomot.ru/uplcv?utm_term=words+their+way+blue+book+pdf PDF link annotation
    • https://strategieb2b.com/userfiles/file/durugagetolu.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613819fb7cf0b---58236078882.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/4532818270.pdfIn PDF document text
    • http://sutipatika.hu/userfiles/files/waxagun.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee9ddc6a7a---mazorowud.pdfIn PDF document text
    • http://sql110.com/pic/zesogikoputonat.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/97908202340.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/ronezenizasiduvefebe.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614087a0c3eb2---kilukatuwopapanefedejozo.pdfIn PDF document text
    • http://masterref.ru/editorfiles/file/namurawuxuzomilemoledis.pdfIn PDF document text
    • http://giadinhlaurenso.org/upload/files/72988249112.pdfIn PDF document text
    • https://powerliteaac.com/userfiles/file/56258157761.pdfIn PDF document text
    • https://datajournonepal.org/files/89064578902.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/5d672278eafea2cbd9df6eac5b655a69/saredisaman.pdfIn PDF document text
    • https://isosklo.cz/uploads/xasopinumiwekesegij.pdfIn PDF document text
    • https://detectagsafety.com/ckfinder/userfiles/files/siginaviberemup.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16144578ae1d41---22697970711.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/99622728938.pdfIn PDF document text
    • http://edituj.cz/res/file/75023620452.pdfIn PDF document text
    • http://evrofurnitura.by/elax-furnitura.ru/uploads/files/menawugi.pdfIn PDF document text
    • https://robustbrakes.com/administrator/imagetemp/file/70003455651.pdfIn PDF document text
    • http://futuralagoparking.eu/userfiles/files/bejitubatoseku.pdfIn PDF document text
    • http://mybyblos.com/userfiles/file/44091235100.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_off0000c916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC916 17684 bytes
SHA-256: ffe0de5ec7ec7b790488435bc115b73ffd8965064fc178567f3b685b8f8bd5a3
font_01_sfnt_off0000f72f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72F 11016 bytes
SHA-256: 6debfc3ab8ef18c59a64f7a9988f9128b164f88dbe372bc0d35469fdd63ddd47
font_02_sfnt_off000110c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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