Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4ad739604cf9def…

MALICIOUS

PDF

86.7 KB Created: 2021-09-01 20:37:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2be615b51359213553f9b4afac1cc084 SHA-1: e6bf81d2c786d2aebea26977f626931e4df2601b SHA-256: e4ad739604cf9defc8a2b759d3bdfd2dcc5d086d2871da5dbe309f0e87935176
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://laptopserwis.com/app/webroot/media/files/logotimakar.pdf In PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16098ad2d770e4---30326544564.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1dbd6a2187---33926344604.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a84a3de0755---musepenamos.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109204249bb1---66133675241.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/1012064675.pdfIn PDF document text
    • http://fkhd.cz/data/img/livodujox.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/82asttrojfi9k1h8eau9ep8or6/25598272666.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607534bd74d1a---26627237001.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/04304c5ab993cb620204fba95422c96c/vuzijukixuvori.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/1f2b2d2ef862d4a448dddf9d5d9a5e9d/20830243997.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/21e00f6613e77c7c807fcfa2a3780c3e/23269425443.pdfIn PDF document text
    • https://dolphinsolutions.net/ckfinder/userfiles/files/totawipopaxidexuler.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608997ee1df20---sazijulajonazapitenepafen.pdfIn PDF document text
    • http://drwatsonsr.com/clients/2/2b/2b9a0cf27321ceab3a47fbd10bf94d34/File/baxabazeregapidarejufi.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/napozojufafikilapali.pdfIn PDF document text
    • http://friend5190.xyz/js/ckfinder/userfiles/files/52275322762.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/wofiwuwomozitoguwume.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/xuzokinewiko.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5735608f8---gejona.pdfIn PDF document text
    • https://noventa.cz/media/files/file/dulejelagukuxosetato.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160875f1e4a76d---85679194394.pdfIn PDF document text
    • https://eccdc.org/application/webroot/userfiles/file/rutuwis.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4839946314b170e84dc7b46830543795/99032279607.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a647515d800---51717256076.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/53145180843.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/saziliwamadepojujipu.pdfIn PDF document text
    • https://t2sc.me/userfiles/85188152185.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=hardy+weinberg+problems+and+answersPDF 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_off0000ee7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7F 17452 bytes
SHA-256: 6cc0f41ad61d36f4e027478c7c96b022264daf0f7b909446ea8bcc22d863c91e
font_01_sfnt_off00011bc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133DA 10968 bytes
SHA-256: 5400a0df76109a395ca6cfe623b83f388d9caa8aea86fc3cc0964f2d4c2c0173

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