Malicious PDF — malware analysis report

Static analysis result for SHA-256 b933bfe43f295ef9…

MALICIOUS

PDF

194.7 KB Created: 2021-06-28 04:13:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 00a297b1ebeed8cd32344a73329a45a1 SHA-1: 11774c3368c0325aa810e3679f4ed158fac03834 SHA-256: b933bfe43f295ef936351c3a9b6fc27622ac638feec12f1fb322d4659280d2a0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious sites for phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious intent to lure users through external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9096

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://irlanc.ru/uplcv?utm_term=in+which+continent+is+russia+located PDF link annotation
    • https://corpusbg.com/files/fck/file/2826088926.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/8a35686560385a07072cb57ee166f44a/joxexasase.pdfIn PDF document text
    • http://alexsrmenchion.com/clients/b/bf/bf5401b25fe3457642f5a6f1150d5537/File/80715785780.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae45b32e053---magosexexiwabinewirilajes.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/u3iv2464gketc4kntqlg6h6vau/rudogogasujano.pdfIn PDF document text
    • https://susta.vn/userfiles/file/rogixibufiwu.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160a89997b204b---18743353588.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/popudojesolirokegilizi.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/5c19338c469665b963b3384a75cbd433/mubanatigufiso.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/80596530204.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/eea2a485cad1e8e5d5171a29fe58fd67/nubenukegel.pdfIn PDF document text
    • http://digemnd.com/UserFiles/file/74617122868.pdfIn PDF document text
    • https://aglogistics-bo.net/userfiles/file/98942645735.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a23f9a06985---rafikiwifigedab.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072041c64077---wesud.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/kazozuteboxaw.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091d176d63be---kumow.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095616951a68---12535182834.pdfIn PDF document text
    • http://scro.ru/pic/file/89294749664.pdfIn PDF document text
    • http://gistys.com/userfiles/file/depibidiron.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff7a437832---76886403964.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/1455938908.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/e48cae4e08b087d1b4de3a522f66c6b4/72395434318.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/49b765028dbd637c739e8525d86f4dd8/denamogufugi.pdfIn PDF document text
    • 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_off0002ea14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EA14 10604 bytes
SHA-256: e2ec25cbdb6e7ca65c1276871f5ea972bdbf4a878c8c1c318680470a2bf232ea