Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a04cea7667f7db6…

MALICIOUS

PDF

112.4 KB Created: 2021-09-08 04:49:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e9fa39f6513f5f896eedb9dd40d1e0cd SHA-1: 0f676d190eed28e5cf57bc436f790ac70c23dea9 SHA-256: 2a04cea7667f7db656858f36af43a804c2f8b4badd411ce9030d7f1e74324fc0
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded links are indicative of a phishing campaign, likely using spearphishing attachments as the initial attack vector.

Machine Learning

  • Nyx PDF Classifier clean score 0.2233

Heuristics 5

  • 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
  • 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://drafthe.ru/uplcv?utm_term=1st+edition+ad%26d+unearthed+arcana+pdf PDF link annotation
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/dedb0d96bdbee3222306e470ef328eb6/kuxanedenizuziz.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607687110097c---kexinaduzexibexubik.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/54162900055.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/10458971073.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/c78489400128bc000036716263eb7cfb/42936166713.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/83797257994.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/16e7526306bb276dafbd008c71c8e22e/65006741232.pdfIn PDF document text
    • https://mzlpro.com/web/img/podborky/files/pujadugatogis.pdfIn PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/36504242287.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/jipikuturudosumerifag.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/18945215275.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a05083ae0fb---lesenewukigegaz.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/15241300449.pdfIn PDF document text
    • https://designclarf.it/file/gafudew.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/eknd7oo8ppmqu87agrstj0u0f4/70423052147.pdfIn PDF document text
    • http://luyenthidhcanhsat.com/Images_upload/files/nuxizororu.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/78250204092.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/41831208349.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/12536d429cd82b8012eaff0365bb743b/5919841431.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/busajiragowoka.pdfIn PDF document text
    • http://gpn1971.org/clients/a/a2/a25689677492d603657f1241a2a69ea8/File/xemakepe.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/71290547687.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/1utsentblhh2mh4d2m38qnjvb2/fekikemelaraf.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/ligutewer.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/23939482229.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016d18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001852a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1852A 19072 bytes
SHA-256: 2f150a91fbd84b68b6eba10293f82960eaad38f2fb118524a524e154beb25715