Malicious PDF — malware analysis report

Static analysis result for SHA-256 29dcb01858827ab4…

MALICIOUS

PDF

95.7 KB Created: 2021-06-29 03:08:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7140067d89bc7edbbb11e9c6f790e7a2 SHA-1: 9ea114422308ff5948cb9975824cd19c25b1149d SHA-256: 29dcb01858827ab438351f1e33ff72e36692f23433eb0d8f328a343bfbb51ef1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised WordPress upload directories, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://ketchas.ru/uplcv?utm_term=north+central+cross+country PDF link annotation
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bb805ae7b2f---98274437893.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/8e454c50d3c29bfbfa0a8d4aef108f2f/65939648975.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da398bdb468---85829728922.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/xusuf.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/f24e9c650f96c63866858c02470f2f47/99220721527.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/lekuzutuzerudupelosa.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608b209bd32a8---virokalerugutate.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/24799265606.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/zodogimipabo.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/6851fqsuopjrkesnn89dm5gvpb/9081605185.pdfIn PDF document text
    • https://ckmusicdesign.nluserfiles/file/noziwabed.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/933fa6fc13a9bf798f0222bd908c3f04/929686291.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b580b669bfb---39357811876.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/fusoloparujosa.pdfIn PDF document text
    • https://bnovum.hu/downloads/nuvexitivup.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/piwoxe.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/41653879349.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202105281246527696.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160909b721b752---46140653063.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bdbb29d622c---durobuligoralaredibepiva.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/8cc6b496ea270d9c7fad1566d09a89b6/gotadozunafuxufoxuki.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/3fa0d00bdf70caff0141e9316c7e16b5/78807877285.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa9ececa67---89925146293.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a249268a864---29743335297.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_off000111d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D9 10424 bytes
SHA-256: e11c9dd4dd22d32853941d068cb393161244f3a1a440b624812afb4ba8aa784e
font_01_sfnt_off00012983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12983 18416 bytes
SHA-256: 785872c41c68e5ce31b5bd254cc5b1b990ac7754caad09e66858ba0af860bacd
font_02_sfnt_off0001598b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1598B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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