Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c97a9e7af8f931e…

MALICIOUS

PDF

77.8 KB Created: 2021-08-10 16:10:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bc3202a6e7973c083ca986db187565b6 SHA-1: 61d0a94bb3ad7111887abc7597a89fdf97895f54 SHA-256: 6c97a9e7af8f931ef7e81588bb68fa77b9327fe0e56be071b38ce1eaac0f9192
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, specifically targeting the 'formcraft' plugin's file upload functionality. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the structure and heuristic firings suggest the document is designed to redirect users to these potentially malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc209124b68---kisikafobud.pdf
    • http://pokewaveanaheim.com/uploads/files/99182743861.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a77001d4594---luroliposaputuwasesi.pdf
    • https://avenue102.com/uploads/file/28932055282.pdf
    • http://dafangtour.com/fckeditor/userimages/file/73802108757.pdf
    • https://dongcohonda.com/userfiles/file/85264786539.pdf
    • https://www.crqp.ch/ck/ckfinder/userfiles/files/62079384669.pdf
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/96f25211330cb15c2f73944388f7c741/19307901519.pdf
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/qh65e368lq37gv5e0270ngng69/50117499139.pdf
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/97575f1031179e4cd833394bdbb540ba/fifivogis.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/4b7df76f6f1b3810fdb700b33d9fdee5/vixagikor.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609890ea41392---21196582954.pdf
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/210ae71b17f14f0dba142e4aa31ae323/wuses.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/sku65llk6n7asjmtt9l3hc07j8/tipipixe.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16071282b4635e---pufezixokivewax.pdf
    • http://unseenadventure.com/userfiles/file/koniluwupakipiwavojowol.pdf
    • https://karolinanowak.com/userfiles/file/dagisekoduwinoletufidege.pdf
    • https://muratay.nl/userfiles/file/65649641811.pdf
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/b81c4969053379f2da7ffbbb09c2136c/zimopineruwatafuj.pdf
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/247630259a1f6d949f9476ebd72a749e/20969012284.pdf
    • https://xn--arbeitskndigungsrecht-best-5zc.de/userfiles/file/80157027615.pdf
    • http://www.WhatSoProudlyWeHail.org
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=harrison+bergeron+guided+reading+questions+answers
    • http://s292376414.onlinehome.fr/datas/imgmail/file/82787224975.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ccd5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD5 16792 bytes
font_01_sfnt_off0000e4ec.bin
fb2072c81afad84aa523b2ebebc66a63dc46064b23b760ca87c7168780c22c4f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EC 10840 bytes
font_02_sfnt_off0000fd8d.bin
d73783a8a313fc662359866e5ccc91d50ee3006705ed49f5a8c672b245160b31
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8D 17040 bytes