Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8898a4e36ec9b9d…

MALICIOUS

PDF

82.9 KB Created: 2021-09-08 12:03:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e314c055c63d214efaa764fc403439c6 SHA-1: 389db68677b59fdf1449c88ad9a39ce5df3a90ca SHA-256: e8898a4e36ec9b9d3c274d3aba06b76c8b7621bc0b168942d85c7a04cc51ad76
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised CMS uploads or disposable hosting. These links form a link farm, suggesting the document's purpose is to redirect users to malicious content, likely phishing pages or further malware downloads. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://shangrilatheshow.com/ckfinder/userfiles/files/lexexesuzo.pdf In PDF document text
    • http://mosvag.ru/img/lib/file/wefujanagexurarega.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee779641ab---1631279704.pdfIn PDF document text
    • http://noidiengiaphat.com/upload/files/donevivufupisod.pdfIn PDF document text
    • http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/noxuxoxetaduvujik.pdfIn PDF document text
    • http://connect-senior.ch/uploades/userfiles/file/papenob.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/kawijefisoz.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/89735137478.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/e478b6174322ae7a480450da4e5f0d41/lufunefepumijex.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffc9a40474---99979711038.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a70590bcd5---rovor.pdfIn PDF document text
    • http://nakatka.com/files/file/59396320947.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/ruzor.pdfIn PDF document text
    • http://fautographie.org/images/userfiles/files/22105553760.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160816f483fa96---gilubadonorefosaga.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/v413hk4653sgudbjdv2fqq2615/56914736794.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16129403a11e39---zosinikixiwazaruwesuwen.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/fopepidol.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/ocuq7lfb7cqrrhl5sng0lhjek3/21627132698.pdfIn PDF document text
    • http://girlstown.org/files/js/ckfinder/userfiles/files/24136208788.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/jogorexogexogugoxafa.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/62610710766.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/28671624492.pdfIn PDF document text
    • https://www.vek-bg.com/app/templates/js/ckfinder/userfiles/files/kagugijofiripinezagik.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/62e5ef82492396e95bff12518808de52/repipoxuxukozetabadu.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/9853610821.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=coonara+hermitage+manualPDF 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_off0000e120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE120 17080 bytes
SHA-256: 04358197ec33ec1edc9b8ff41686bb9df63f9107a901f2a4d5cbcb3ab0598e44
font_01_sfnt_off00010dc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC4 10516 bytes
SHA-256: fd0f4a6ddb01cb89220d479c22460255ba0a95e683aef58a70d4bcaa6081b41a
font_02_sfnt_off00012583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12583 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1