Malicious PDF — malware analysis report

Static analysis result for SHA-256 16dd9d666b8ae187…

MALICIOUS

PDF

87.6 KB Created: 2021-09-07 16:26:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c63b4bf06b8cf06021c3f26bc7aa0c6b SHA-1: f67c5fba5ddac42d908303fc75af9c346934ff44 SHA-256: 16dd9d666b8ae1872620f68d4333bc76c2cab1d3b411dd74c5ff1d09dd0df6a6
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's intent to solicit sensitive recovery secrets or private keys from the user. While no scripts were directly extracted, the presence of numerous URLs, some hosted on compromised CMS uploads, suggests a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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 http://bona-agra.pl/Upload/file/28053158565.pdf In PDF document text
    • http://twfindia.in/userfiles/files/somosebulubokijedujisi.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/zegosap.pdfIn PDF document text
    • http://heorungminhphat.com/luutru/files/vukupivotenirisafopabarad.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/sazoxoxus.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a910d7c83ec---19289743581.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/0585b4a689990913024862ec0fcb4356/xikasofo.pdfIn PDF document text
    • https://munord.com/wp-content/plugins/super-forms/uploads/php/files/c7fc064ed2d63507f889d29d325ff41d/natukuve.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/bozazegilizodabibotejidej.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/tuxuzisigezuxekapiwoned.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/ninudokokunom.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/ladozu.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/subumisaselaraxazamo.pdfIn PDF document text
    • https://ijp2.com/contents//files/74216999344.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/82367081929.pdfIn PDF document text
    • https://parfumzone.ro/files/file/37844837664.pdfIn PDF document text
    • http://mptech.vn/ckfinder/userfiles/files/rimuzunupaf.pdfIn PDF document text
    • http://fittbike.hu/files/file/18989387011.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d04ee32bcb---70554069068.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbaf14486e---fobelegemofute.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/24971150445.pdfIn PDF document text
    • http://fructusartis.com/i/File/9421257405.pdfIn PDF document text
    • https://coil.hk/upload/files/sebadizopudijonu.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/f50058f8b8da024236285d4ae97bb176/kavulunezadojironizow.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/63816123675.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/tivetijibututoraka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=safari+online+books+download+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_off0000eff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001080f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080F 10784 bytes
SHA-256: 2dbbb2a39cf5dd79e899720245fc9b6ff86ad1fd8f5092152ca978fcd23f55bd
font_02_sfnt_off000120c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C6 18388 bytes
SHA-256: 0eef4b0ccde23918011c7daac59c371b1b032b962ec66463128b837eaeedb09a

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