Malicious PDF — malware analysis report

Static analysis result for SHA-256 923bb2989ab10346…

MALICIOUS

PDF

94.9 KB Created: 2021-09-06 22:05:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9510cc6612766e0f2e508e6d89158ca9 SHA-1: a51f58e8cc1f98e263419554222a9a1eacde840d SHA-256: 923bb2989ab10346baaac506ea0e4250c281130de5d38ec773d6905800f935ba
184 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and a large number of external URIs, many pointing to compromised WordPress sites and IP addresses. The embedded JavaScript and link farm structure suggest an attempt to redirect the user to malicious content or initiate a download, likely exploiting a vulnerability within the PDF reader. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://philabc.ru/uplcv?utm_term=statistical+quality+control+montgomery+solutions+manual+pdf PDF link annotation
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1609afcf44ce47---25736318994.pdfPDF link annotation
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b10c0b94052---21312495408.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/75985445663.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/f9f8b2bb2852df1de537a04595148837/99869056757.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/j24nhkr4uav5iuodc1fdjj2l84/pizolu.pdfIn PDF document text
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210619030311618851inmsbv.pdfIn PDF document text
    • http://diamond6ranch.com/userfiles/file/nemakilada.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/38099297488.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d97488a33b---100340812.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/40f85ec3ce633693f1013c03fe688666/rokudaredikejududaniwulu.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/89245174503.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210622212059146.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/43523364355.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/68530399966.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/7fbbff0b0023b96c7637ae813187ff4c/redomogutivamujanutud.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/32916614775.pdfIn PDF document text
    • http://shiokuda1.com/contents/files/felagizurunusirimug.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/21859909481.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/94279932633.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160899d61a47ec---79236387492.pdfIn PDF document text
    • https://mastirz.com/userfiles/files/14737361449.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/sowupanumusupafuxipu.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c024bfb76b0---91574694464.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/wimowojumosezutubi.pdfIn PDF document text
    • http://vipdiler.ru/files/file/6172828598.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/216098ba7e903d8f865f62fafd135eaf/jabozagoxo.pdfIn PDF document text
    • 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_off000105bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BD 11396 bytes
SHA-256: d68c76a174eb6610be3c17157dfc3f4c547ab9f0e2cf1fceae3178dcfac7e158
font_01_sfnt_off00012019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12019 20388 bytes
SHA-256: e519b312e259c93ad9e86e79e3d00cca87a2c1afe9a5d9a5d01b4803ac19dadd
font_02_sfnt_off0001553d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1553D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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