Malicious PDF — malware analysis report

Static analysis result for SHA-256 853640173c012774…

MALICIOUS

PDF

80.4 KB Created: 2021-08-23 18:32:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2e30fd9ace4e3c84e569a849f3dfd0f1 SHA-1: f9f3a832ef2651a215c0a5754c4acb6403a1733f SHA-256: 853640173c0127749d778d8b2874476d9fa58cd2f56c0c0ea2fc8121e3330a87
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple websites, many of which are hosted on compromised CMS platforms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirm the link farm nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/bnn2csds6f7kv35mptajm99bja/34897934400.pdf In PDF document text
    • http://cfacgroup.com/uploads/FCK_files/file/sokadabupapatipumawane.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16079c5a5dceb0---nopakezivovas.pdfIn PDF document text
    • https://rinducm1.com/contents//files/53144694407.pdfIn PDF document text
    • http://gemwishrs.com/ckfinder/stones/files/87602173310.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/3378507518.pdfIn PDF document text
    • http://industriefotografie.ch/userfiles/files/78628197962.pdfIn PDF document text
    • http://westpakusa.com/phpsites/vertical_living/uploads/file/31301358123.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/1f55d5508376347ea788fa4f66eeeb99/mujemogor.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/ssfon8n7upb2cfusih2fuqk8a7/88838710843.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/63cd947c26b75cc75f03d518e5a09e91/25714883769.pdfIn PDF document text
    • http://heatkings.net/fckpic/file/63080037854.pdfIn PDF document text
    • https://e-ceramika.pl/userfiles/file/45573971385.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7910d8a18---98487825054.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160716691e8677---30781567510.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/64890419672.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/xamulepadofavo.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/cf2984ea956982292c01766a6a1589d4/foralabejojux.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/gufogudubeluvalimif.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608f60f751bc1---48192510319.pdfIn PDF document text
    • http://uchid.com/uploads/file/zomanipevigebujir.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/65151jf1fljgon4i32gj9kstis/fazezidisalidozopejakuja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=title+for+house+salePDF 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_off0000d85b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD85B 10272 bytes
SHA-256: 24c706f119bdebf6dd9406a37f1fdbd509c46b4697585cf9b9cff51c43400060
font_01_sfnt_off0000ef9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9F 16804 bytes
SHA-256: 05e1891ac8f9a5930948f83f20c80e778836b17819814ea7d8ca3f0ac6c46bb0
font_02_sfnt_off00011b56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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