Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfabce5d7223a6cd…

MALICIOUS

PDF

85.1 KB Created: 2021-08-10 18:44:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 9bdcea4a9775532a84c9068f10dc4066 SHA-1: fdd9f02fc56baeba244feb5fbc228708bd93d553 SHA-256: dfabce5d7223a6cd316da3b52f2fdcfd87893578373f98645a1f9151d97fe031
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, many of which are hosted on compromised CMS platforms or disposable domains. The embedded URLs suggest an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 6

  • 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 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://alixdemassy.fr/userfiles/file/56848249162.pdf In PDF document text
    • http://recrute.fr/files/files/suzusasolifu.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/kedugutetuguman.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ohgqg3tllqo139blkghobhe7b0/67286118940.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/98257754022.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/menisavejipatepepi.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/11865905678.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160745b28c2778---nutabisorunuradorobolu.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/ppgr76mvfqsd8hafvuicv1jp1n/nifiwemawuxufudofoz.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/wowukeronepulisuz.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/201abcc997a9285e4a6fd90df7771b30/70452690758.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/30431100061.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/01hsb4q15f5r2a10nldhjh4qe5/fuzizugoxekigiko.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607be4dfcbc54---2433077776.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/78ml3gp23hvr6gijoc5b6v98hb/59401330444.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4005884cf---lulinepo.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/jutudidajufa.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/rozuw.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095544e48dbc---mojifutenajejukaxetarodag.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161065ba921dfd---18182254605.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/linejiket.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/xewuzufikoseluvasinuxa.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/kctngeibilv6e47d7stk0rj1qc/33760085408.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/36476959696.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160d5383f963d9---solujos.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609403f29cb57---mudirexemopaxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=walton+county+florida+jail+logPDF 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_off0000e93a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93A 10688 bytes
SHA-256: 12039977b2a7971c8f6d295a93b9e7a235c2a56ecaf52636894b05fa570b07e8
font_01_sfnt_off0001019c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019C 17032 bytes
SHA-256: 9ff524d3d100f85f45b85593a97a1fc9bf30aa23d5691228f268db98e2d080b3
font_02_sfnt_off00012e31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1