Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ca0331dc6526f8a…

MALICIOUS

PDF

79.7 KB Created: 2021-09-02 05:00:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d75153a67668fcd70aa0fbaabeb3e978 SHA-1: ab456f9f788709a8e87be4c21cc8a5d62e94b539 SHA-256: 2ca0331dc6526f8a0fe05649a71bcd223b380db37776b0285af71cc934b87ccf
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the structure and heuristics point to a malicious document used for redirection.

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://wegofa.com/userfiles/file/levupigi.pdf In PDF document text
    • http://kalmi.ru/upfiles/files/59588518649.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/6230740742.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/xomivogisafipaxisami.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/55a1f955d7050da2155377c962258d71/19589988725.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/42c15fe957d1fd4f71075801eacaced7/debagej.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/pibonawuzolerasixeludali.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114bc61a1e9a---90017419055.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/46871437622.pdfIn PDF document text
    • https://capecoralliving.com/media/file/17915289746.pdfIn PDF document text
    • https://greffedecheveux.center/upload/ckfinder/files/fevabadamaxeboteg.pdfIn PDF document text
    • https://gazelletr.com/userfiles/files/61813232244.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/60193033234.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160a9487d529ca---5274951741.pdfIn PDF document text
    • https://bachson.net/upload/file/kafiluzopopib.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/jaboperilasajutat.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/nariwijukotexagolijebur.pdfIn PDF document text
    • https://euchebnici.com/img/file/74916508008.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16096a25d9b669---69635579451.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/rudawobekurovaketivu.pdfIn PDF document text
    • http://tomlitkom.ru/ckfinder/userfiles/files/30778361995.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/20747225340.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=components+that+make+up+an+information+systemPDF 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_off0000d44a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD44A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC61 10916 bytes
SHA-256: 60ea15edbe8e32bed24e1f8c71523a80e17e439ca6596cce746d87688e2f08ef
font_02_sfnt_off00010582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10582 16820 bytes
SHA-256: edf4bc09e182d7b0918d99757cdb5f4eeed89b4fa7da02cb8262673f1cc89e38

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