Malicious PDF — malware analysis report

Static analysis result for SHA-256 9116aa22081de784…

MALICIOUS

PDF

98.2 KB Created: 2021-09-19 10:59:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b2e4a64d9ced937da4aade7b68ce5235 SHA-1: 92980e9430108e54d3f93ebfdde45fa7ae438dad SHA-256: 9116aa22081de784d3554faf9fb7cbf08d60e368e5b07776f3ff951b31c29eac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple domains, some of which are compromised CMS uploads, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • 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
  • 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://malashealthcare.com/userfiles/files/15541856588.pdf In PDF document text
    • http://bularz-auto.pl/images/userfiles/file/dokepanawelamalerepugexe.pdfIn PDF document text
    • http://yung-shun.com/userfiles/file/17569984498.pdfIn PDF document text
    • http://azinsaghf.com/cache/fck_files/file/70016691413.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2b7f5e8df---69217697002.pdfIn PDF document text
    • http://denprokhorov.ru/images/file/kagapojuwavavu.pdfIn PDF document text
    • http://orenprom.com/img/account/file/jogomajelofagifunixipi.pdfIn PDF document text
    • http://jayeonrak.com/upfile_editor/2021/files/35324118279.pdfIn PDF document text
    • http://phanvienphianam.com/uploads/userfiles/file/57037618449.pdfIn PDF document text
    • https://lexcochoralsoc.org/demo/lccs/beta/userfiles/files/roxofutubebozifej.pdfIn PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/93170444137.pdfIn PDF document text
    • http://www.skk.com.hk/admin/ckfinder/userfiles/files/fafukirawosemu.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614547a26666d---51838681674.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/jetijivuxomoz.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/jimebij.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/gafipixodarubu.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16145a157b9049---82956383628.pdfIn PDF document text
    • http://thegioicamdo.com/upload/files/876839285.pdfIn PDF document text
    • http://redskap.ru/userfiles/file/52288734985.pdfIn PDF document text
    • http://gainliving.com/upload/editor/file/pizixexezuxisigadakamiser.pdfIn PDF document text
    • http://radecznica.pl/userfiles/file/41224642637.pdfIn PDF document text
    • https://rwd1.thadv.com/upload/files/28475104050.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/161370454b0adb---7918380563.pdfIn PDF document text
    • http://komodovo.ru/upload_picture/janoborikenokurugij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=the+body+keeps+the+score+free+pdfPDF 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_off00011931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11931 18992 bytes
SHA-256: a6ffe0bde88b236e46033cb3499fe4af499b482ab72271b40b8cc16371131dbf
font_01_sfnt_off00014a8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A8F 10624 bytes
SHA-256: 0fac0ee8a59363939ecc61c108ae2ddadc95c71947dfb32add93c3b998cd402a
font_02_sfnt_off000162d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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