Malicious PDF — malware analysis report

Static analysis result for SHA-256 157f7fedab1bcea3…

MALICIOUS

PDF

87.9 KB Created: 2021-06-29 09:22:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 07df8d4e0597dd6410f97292e1c47d8b SHA-1: bc683f00c5cc3f8255ed56e26157d4c47c45d9f0 SHA-256: 157f7fedab1bcea379678fbd65f62dd1db80b21f66c5f2312f314bf9f7c91d2d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' lure further supports the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9819

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd9324a8b4---jevawowa.pdf In PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160a45a48785c0---gisegisirogupagemunom.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/ximevanezopubaba.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/b4urtrj0s89pcnt56q0mvk9lg4/savawuzololago.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5a1bc992a.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/a59ef938c710fe5b0c7dd9dbf798380e/dirapezinidawevefeletowas.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/0a2e0911a418451af7602e58fa602244/taromodugi.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/94371493681.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/xosonivedebigoragufiz.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/t7am90nsn6u1fu5jiiq08ijptt/gujejotatawadikivog.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/qm2fkmkbcc2ahngfvsqm07boek/92808717521.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c09169c0c79---nopepivolunakelonivefej.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1c1a333f6---naxelorab.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/tenavoraleno.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/il6vl1m0sbsvct7398tr728p4k/43556532233.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/4641154316.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/74754463936.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/b73adb99f4257d5b610c6948b16cef69/97112164310.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/zifenaperitu.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/bufumitafijudulutexomu.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/fufarek.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bdfbd4cbbea---tuzomajatarokunofodamasaz.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/25705c94ccc03da2bc12cc41f9b64b50/xiwibukazudalomotox.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/55198521341.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160da3bccd3410---67115658505.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/e204576da0b3611c0670a28c5a296e03/1861151228.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/40041779102.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/cb8b32b22c76003ff378b24274b6fed4/52374921624.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=five+little+pigs+book+pdf+free+downloadPDF 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_off0000f38d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA4 11036 bytes
SHA-256: cf83598a734057542a163eaf05e831591f2733ad0a77eae833a8219d203f767a
font_02_sfnt_off0001250b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1250B 16712 bytes
SHA-256: 4491b41da09f44d04ba72eaa59ea030b6ac1bcefdac2a2a99efdac10c57201f7

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