Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac92cf5cc21c0b55…

MALICIOUS

PDF

89.4 KB Created: 2021-09-01 15:54:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 435f22121be31d8e4b366346a339cd0e SHA-1: 60e0747398d99bdff3adfa52504007181e94904c SHA-256: ac92cf5cc21c0b553fa35ba7a228d6bc4294941812db997156b51847a1ee73cf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains an embedded JavaScript stream and a large number of external URIs, many of which point to compromised WordPress sites. These links appear to form a link farm, likely intended to redirect users to malicious or phishing content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160be2cbde301b---tafokenudenivobij.pdf In PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/53b2e0edcc0e96743550f12045ce2dfe/23637975426.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/vauobu03p23qdjrd4ubsli4urh/79558736684.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/tavenakidafokoj.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/fb1706c4488df5c50e7fe3b67daa8115/suxipokuxunizud.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/85720313745.pdfIn PDF document text
    • http://snuhonors.com/userfiles/file/61105810597.pdfIn PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/siseginupigofozawijofiraf.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/sugiwirazazimuvezewib.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/45361ecf9304cff2d6598a12c211ce9b/jaxemexamajimeforikuvud.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/purusozarawofor.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609887af2949a---66223314366.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/80500644823.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/pirede.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/c829mmfhmanbukuo7628qflbsj/muwesikakuwawunab.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/subijodakozo.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/92472456159.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/bufajowewesivite.pdfIn PDF document text
    • http://thefjordbaklawfirm.com/clients/876731/File/45890618684.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d61239434---dilazuwopasurixef.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/4mqlb2u7bls0f9kftf9kv4juvg/dapekijebevapos.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/suxifux.pdfIn PDF document text
    • http://joltiy.ru/uploads/files/sowanivibekusokakukepu.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/68401b13479b62fd4daaf608251e5ed4/pipize.pdfIn PDF document text
    • http://48bulls.com/js/upload/files/ziwojetemuzabapemubededu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=conducive+meaning+in+englishPDF 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_off0000e76f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76F 23808 bytes
SHA-256: 9d520f5a3b3e7fb6f7b9862253aa79a659d260cb601f8d2edeb130994cd25bf5
font_01_sfnt_off00012447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12447 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C5E 10816 bytes
SHA-256: dd7bfe4392ea3fbae3b4dcc8ee34ba4cb3c15549d5da7cc635f8f96d7f6cefce