Malicious PDF — malware analysis report

Static analysis result for SHA-256 bba5825625de6c75…

MALICIOUS

PDF

88.8 KB Created: 2021-08-07 08:03:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9e96bcab00c9e99b72e55f04b3b1ce96 SHA-1: 82aa85eb8ba6000aa0e6f7d2c89c4d6d5ad3019a SHA-256: bba5825625de6c75bffc618a3c61f03fd8c25191278031be86e865930b9f96f2
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-severity PDF_RANDOM_URL_LINK and ClamAV detection. The file contains numerous links pointing to compromised WordPress upload directories, suggesting it's part of a link farm designed to distribute malware or lead users to phishing sites. No scripts were extracted, but the presence of external links and the nature of the heuristics indicate a likely intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1609421728bb7e---20255566063.pdf In PDF document text
    • http://bike-aholic.com/UserFiles/file/4367022114.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/625eohivc97cv3r8ls9l9lpdp7/mukuwunilurusitudaru.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/89027164446.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/wokimarinowoxa.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160781eb141dc3---67926808963.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/75822989365.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/8d44dfbac8a35bc8e5542390aa1d3942/82292279739.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/miperojipi.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/soguga.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/78538010758.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/puxozutipojuvu.pdfIn PDF document text
    • http://developmentassociationofnagaland.org/nbloom/fckuploads/file/90818587125.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160a42150cc912---fuludubo.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/wiwovimor.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/jodetazixuxuferuxam.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/7510981536.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/f191641114933b838d4efe8d4955c8eb/55109166223.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e82717a86---botoligevumifiwaramutugip.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/20443360764.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/56316910174.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de504ddfd9---tiwubazokeb.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/86786409939.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+work+out+your+foundation+shade+onlinePDF 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_off0000f78d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78D 10832 bytes
SHA-256: e5bb52dfe35f334634599652a47dac953faf8fdfdfbd6d05707038a7d4feb099
font_01_sfnt_off00011086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11086 16944 bytes
SHA-256: b67cdc57f86e636a317c366b643921b14968a090bf3ede0159ccd9281e392b09
font_02_sfnt_off00013c58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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