Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b7b31fe8214f7cf…

MALICIOUS

PDF

70.3 KB Created: 2021-07-13 22:09:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bbb3ca94fe48f2c44030cbdfcb8bed4a SHA-1: 99fcd4bc781725741b2bb2d9820b4345b609f97c SHA-256: 9b7b31fe8214f7cf15b2da8d97c58c1c567609366c9ee7d9f61191dc0c916edc
154 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple external URLs, many hosted on compromised WordPress sites or disposable domains. This behavior is indicative of a phishing or malware distribution campaign, likely delivered as a spearphishing attachment. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7307

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://candica.pl/ckfinder/userfiles/files/migajakivapovefiwana.pdf In PDF document text
    • https://jobtiara.com/files/files/43231764649.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160755cf08f550---59116346414.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/84286264281.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/fec43d786b9efc091d6b061f09b0f10b/rarunejen.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb29ce7cf1---56503953721.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16091edf2c39c7---pipubigomifakesiduvufoj.pdfIn PDF document text
    • http://shs67classreunion.com/clients/b/bf/bf9552935413f2527bbee995f2dfc9b5/File/66230622907.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c910c266ac---nirane.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/73e782f9ee5c74dbeda81ab15d01698c/mimawapakor.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/9621744994.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/7f1494a27589b55708b107fec878f6ef/bapegikobabumimugaz.pdfIn PDF document text
    • http://yjsyrj.com/userfiles/file/23023202773.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/b481c194b31c3108c2af952c69c71e32/sujawafav.pdfIn PDF document text
    • https://limsurdua.com/contents//files/zupesakaxusujajavizonugog.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/sonurisumuzimi.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/00es24dt6fg9s634klp1fd01lu/wovimowigufefikoxezoveti.pdfIn PDF document text
    • http://whs1963.com/clients/7/75/758a827d59fb1c2827eec60421ffdc22/File/xabopejunusepunave.pdfIn PDF document text
    • https://bettyloupaints.com/userfiles/files/84768172816.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/88610363075.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/6987927591.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/72952465629.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=tamil+movies+2017+full+movie+downloadPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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