Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a16d8d9979cbe1b…

MALICIOUS

PDF

93.1 KB Created: 2021-09-12 19:08:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4bdce1d8e9c4fbba345abf47d7e78644 SHA-1: 5377d77e9ea8c5e43cbba02f9b44328c40f855fe SHA-256: 8a16d8d9979cbe1b03cb095a5117c205ba60dec6930b878da5c4e7dfcdb34564
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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 likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9761

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.
  • 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://allytemp.ru/uplcv?utm_term=fake+text+message+android+with+date+and+time PDF link annotation
    • http://capitolmetrophysicaltherapy.com/userfiles/file/xibudeke.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/76996338552.pdfIn PDF document text
    • https://melz-feu.ru/upload/36009160995.pdfIn PDF document text
    • http://zehanbiopharma.com/upload/files/makejumakapepe.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/84535001682.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138627042162---tojatuxeditesufu.pdfIn PDF document text
    • http://soosanfix.com/upload/fckeditor/file/gunijukenerasevaji.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/afda52d38c4ba4e456527fd6e763119b/rugakejerab.pdfIn PDF document text
    • http://sasmedm.com/www/js/ckfinder/userfiles/files/pabunevodanijenoxulo.pdfIn PDF document text
    • http://zapatosperezcabrera.com/ckfinder/userfiles/files/66682549728.pdfIn PDF document text
    • http://noticiascgnews.com.br/ckfinder/userfiles/files/guvivuw.pdfIn PDF document text
    • http://89928386.com/uploads/files/202109112001128381.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/42600320496.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/bemibalefu.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/923a0eb7a0e2ed242168657ef90f3ea1/60020546989.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/80158531967.pdfIn PDF document text
    • http://195exim.com/datas/files/lewubodala.pdfIn PDF document text
    • https://membermimpi.com/contents/files/12733865969.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/wizofetisebo.pdfIn PDF document text
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/dukigudijumegumejivevu.pdfIn PDF document text
    • https://wita.lt/images/files/foxusiza.pdfIn PDF document text
    • http://zopos.zohukum.com/ckfinder/userfiles/files/sudikudubanakiv.pdfIn PDF document text
    • http://protezas.lt/i/File/3787868015.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/52225884275.pdfIn PDF document text
    • https://yasacompany.com/upload/files/22085126165.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/74897729986.pdfIn PDF document text
    • http://www.octopus-quatuorvocal.com/ckfinder/userfiles/files/38109344545.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e84f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10066 10908 bytes
SHA-256: 819c5ab28c8d1f679d846fae8e190ecf1597266227a32804febc2b46822b50a9
font_02_sfnt_off0001194c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1194C 18900 bytes
SHA-256: 00ab31a3fe3fd751c90d9013a010ddb57e3d26a680aa4452f6c30c53718168bb
font_03_sfnt_off00014a40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A40 17816 bytes
SHA-256: 6621eb4eb3d16ed2e03e45701af3c895d42370fb9f750f6ef3170e1141969040

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