Malicious PDF — malware analysis report

Static analysis result for SHA-256 e33b379294d393fe…

MALICIOUS

PDF

85.7 KB Created: 2021-08-25 23:46:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9593b148c5dca317828b7051f5521941 SHA-1: 7af41f5897a8ffe8fc93e0b7e5fb5e96130c9f1d SHA-256: e33b379294d393fe8f37f8d55906661316c77a7c7f9e40ae88caa6b96b83dafd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and a significant number of external URIs, many pointing to compromised CMS uploads and disposable hosting. This suggests the document is designed to exploit vulnerabilities or trick users into downloading further malicious content, aligning with phishing and exploitation tactics. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://philabc.ru/uplcv?utm_term=pink+villagers+animal+crossing PDF link annotation
    • http://constantcontinuity.com/membership/data/files/41299791473.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/bexinezonixetipilikekizu.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/e3d2a0b789275e925406871a7bb0c8fa/6859107377.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/24089366062.pdfIn PDF document text
    • http://clingac.com/d/files/90369696794.pdfIn PDF document text
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/85982140709.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beb3e5f27e1---87331800626.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/wirowupigilodanisozogak.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/86731f05cf5526305ffd64b1be48bd1e/jirekegel.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942be76fa9a---23016265181.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/doxotija.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/8c6a54a2f0332748bc3e491f5ca45058/duzonunawiki.pdfIn PDF document text
    • http://proxkimya.com/resimler/files/winuvop.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/bawuxovelegazorevowomako.pdfIn PDF document text
    • http://dentherapia.hu/files/file/tobedusasamebob.pdfIn PDF document text
    • https://thinkhigh-tech.com/d/files/27219425304.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073141b86254---90728958758.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088be468979e---311912408.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608254943dd71---razowifakisuvokozagegex.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/roborisifibewazefuwe.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160710ea27082a---vevujafematipekugele.pdfIn PDF document text
    • http://sme1970reunion.com/clients/7/78/786f1e38e9ed540b4a7d4f5dbcc09398/File/zirodejuzimupulow.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ad6d125b6---60809767543.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1610ebcc0c324b---rebumizabigos.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_off0000ebc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC0 10636 bytes
SHA-256: 2f46afbf957d220f0bcfb8770cf62dab261212d01fa9f3db7636159628f3f3a7
font_01_sfnt_off0001040e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040E 16924 bytes
SHA-256: cb0b9d2657a3460a126365a14aa8cc728444c43b529e86cfb97b640cef71822d
font_02_sfnt_off00012fea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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