Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaacf4046a3638e3…

MALICIOUS

PDF

96.4 KB Created: 2021-08-25 15:55:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 34fe44b21f88b44c2d1f101af0013a32 SHA-1: a64cf1a19ce00373f8b1dde71ba04c12e5c608f5 SHA-256: aaacf4046a3638e304f291e8a586b532650c3b7446caf7970a86839a9da28401
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it contains embedded JavaScript and acts as a link farm pointing to compromised WordPress sites and other disposable hosting, suggesting it's designed to redirect users to malicious content or phishing pages. The embedded JavaScript likely facilitates the redirection or exploitation process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 7

  • 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.
  • 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://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/a1325f84e5cc633d42edea3a0dc71b39/3225643635.pdf In PDF document text
    • http://sacmacbook.net/userfiles/file/puvevomupaxagogogo.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/fifodabuxeraligawoxat.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/16175552161684453b28e19ee4cad34c/vemuwifasidonorutix.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/1fb9edf0i6o67kk41lfqisvav2/fipevow.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160c04c69bf14c---59545170529.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160fa79fccb50f---jopojesuvuk.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/taxamiziki.pdfIn PDF document text
    • http://buchtel1967.com/clients/26382/File/foziviv.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4891fbbf2b---saros.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/69ca161893b4eae6c1c56cb1bc4b55b0/28622116766.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/44571132416.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/xeselumazix.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1612112bfaa7de---61313346880.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/fazuxid.pdfIn PDF document text
    • http://caythuocdangian.net/images/files/92043488568.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/komefolubujexakol.pdfIn PDF document text
    • http://ristorantebiscione.com/userfiles/files/43389863917.pdfIn PDF document text
    • http://tj-1970-50yr.com/clients/e/e8/e8fccb6fb94f20b6ca4375945b3939e1/File/jawuriwezole.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/uvml5jro2g8vg8rr68lnbfbess/85426371482.pdfIn PDF document text
    • https://stauber.lt/images/files/rowunisepiw.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/93616729724.pdfIn PDF document text
    • http://kusadasidentalclinic.com/img/userfiles/files/44506507923.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5466e1bf6---vasanazexotogud.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/81454599588.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=body+parts+of+cow+used+for+protectionPDF 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_off000115e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E8 16796 bytes
SHA-256: d980179962dc8865f064cb17bf6b1879dd0e7bc0b17e5700f55c895e938f81ab
font_01_sfnt_off00014196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14196 10920 bytes
SHA-256: 5c4ebbf8fc2a05fa15b01b0eb2cd91e9780c18859a5efbd4af9236a5b926dad8
font_02_sfnt_off00015b2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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