Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb68bdecdf950777…

MALICIOUS

PDF

94.0 KB Created: 2021-09-14 08:36:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e9ee7497671e3f6e1ddab5d6d7260891 SHA-1: 8ab473bbd0ca7f87f6f82daccbb29ed6749e1c9e SHA-256: bb68bdecdf950777bc5c72144c79100735497d6a9eb01fe55e7d60c06b628160
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous links to external sites, many hosted on compromised or disposable domains, suggesting it functions as a phishing lure or a downloader for further malicious content. The presence of JavaScript points towards an attempt to execute code, likely to redirect the user to credential harvesting pages or download additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/161311ed85df6c---samemegovu.pdf In PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ef5f2c250---4417671005.pdfIn PDF document text
    • http://unionnutritech.com/upload/files/ribarigolu.pdfIn PDF document text
    • http://energy-labels.nl/userfiles/file/68636455683.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/39c9c149db2e1dd7d77d8b5ecfed837e/80037602919.pdfIn PDF document text
    • https://vietucmould.com/img-vietuc/files/10694869053.pdfIn PDF document text
    • http://imi.vc/upload/files/mowatovugen.pdfIn PDF document text
    • http://paliukenas.lt/i/File/xujiselanowobamelagi.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/88537330184.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/sepun.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdeaca655c---65829344627.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/vunirafamenadu.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/8379205531.pdfIn PDF document text
    • https://www.l-games.jp/js/ckfinder/userfiles/files/8037332510.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/84580146399.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/polelepomexagobuk.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/wefanogi.pdfIn PDF document text
    • http://reliancefla.com/admin/images/file/forujajusekeromogageme.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/31281596159.pdfIn PDF document text
    • https://ra7a7p-h3ba7.com/contents/files/fivigixomamelipala.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/vujakutewo.pdfIn PDF document text
    • http://turatabor.hu/media/89518385805.pdfIn PDF document text
    • http://st03.it/userfiles/files/52642525973.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f163135f2f---38926454037.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=instagram+password+finder+no+human+verificationPDF 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_off0001021c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021C 19916 bytes
SHA-256: b27f1ff10d9a3fdf720312052c4605ffa383747817ea784a78e9e9900d07af54
font_01_sfnt_off00013689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13689 11224 bytes
SHA-256: fc4bf0a2c1b8986834923847ad37183de6d87b81b8da540fe149a34c2d0a57a7
font_02_sfnt_off00015088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15088 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1