Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac29accf2e3cfdc0…

MALICIOUS

PDF

74.1 KB Created: 2021-09-17 02:42:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e3185e755e9bc8607f36393dec50871d SHA-1: 6a8d77a7001738e4a884971a16da319abb0d1095 SHA-256: ac29accf2e3cfdc0cf3d5ccff6f9d8bc2acb2ae6aba3439081d255695bdeccfc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6bd9921a9---godafejisuwofufusasuwomag.pdf In PDF document text
    • http://rayer.cn/d/files/muvapumobemulop.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/jinonotagibutobuda.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/samiw.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/jinezemikuta.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/lulorobinimi.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/zigupe.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/29980789871.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/98642072210.pdfIn PDF document text
    • http://ad.ditroinfotech.com/laportal/ckeditor-ckfinder-integration/uploads/files/52330229766.pdfIn PDF document text
    • https://www.alitec.es/js/ckfinder/userfiles/files/damevekog.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f71050165d---96911859805.pdfIn PDF document text
    • http://hoachattn.com/image/files/mekugefazagepakupagel.pdfIn PDF document text
    • http://careerpathrecruitment.com/swapscan/app/webroot/js/ckfinder/userfiles/files/jadanifixirejis.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/e4cf7c103eb0c36daa2f3ec2da47bc82/lutozuzoziva.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/68680784048.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/161410b92331a2---nenanonulabowapapikesinuz.pdfIn PDF document text
    • http://multiflex.ru/userfiles/file/siveloviwiwoxivigewi.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/39396692982.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/livasuzez.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/dtke7ak9nksejqhcq1807ud9p0/40273108025.pdfIn PDF document text
    • https://arbormaster.net/uploads/files/safofotofivilaxake.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/tobinadagogijejikesij.pdfIn PDF document text
    • http://chapelguild.com/images/usr/zakigezojonuvo.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/38257879167.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=windows+10+tricks+and+tips+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_off0000c350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC350 15036 bytes
SHA-256: 96dbb7bd6b8a1e034d227f8a6b4f5643957c2f55de90e2c68e03ba6cbc467436
font_01_sfnt_off0000e999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE999 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B0 10780 bytes
SHA-256: d423c841fc510394902aaadda76f941921f0c96fe6d77046586a44ce46a85dde

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