Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c4674b58d9916a9…

MALICIOUS

PDF

78.9 KB Created: 2021-09-18 19:31:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fcd8af79eb63509ce1aef9454292fd93 SHA-1: 40a73b8d305f6cf72c812c40ad83aa11b6cfc7ec SHA-256: 9c4674b58d9916a91179226f3980a7dde1a84935ff29c4e8681a1a051f73618d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites 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 a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://infrive.ru/uplcv?utm_term=android+phone+black+screen+data+recovery PDF link annotation
    • http://paglialonga.it/userfiles/files/57916402423.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/99477668850.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/27600811207.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144bd08f1841---27591469457.pdfIn PDF document text
    • http://naso10.com/userData/board/file/nisezigagiturovujanited.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613edc6ddc215---sojefajuzoxudakobi.pdfIn PDF document text
    • https://www.hemingway.bg/app/templates/js/ckfinder/userfiles/files/15951445300.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/2hfk3olrsr1ev962pgqefc3ps1/muriturebusu.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/0862135a77b1623d4e11a8521769af35/wetelokamaxiroku.pdfIn PDF document text
    • http://aven.su/userfiles/file/23598380642.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ded11c0d0f---30297373552.pdfIn PDF document text
    • http://cantinachitarra.it/userfiles/file/vafimoji.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/lekotana.pdfIn PDF document text
    • http://klemanpince.hu/files/file/4774855397.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/jomawejatude.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/guzajozoti.pdfIn PDF document text
    • http://santabruna.cl/upload/file/26778161581.pdfIn PDF document text
    • http://kondicionery-dzerzhinskij.ru/upload_picture/file/xesisopemavudodowipe.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/64313764059.pdfIn PDF document text
    • http://etre-belle.su/images/file/peguxes.pdfIn PDF document text
    • https://butyfarm.mm520.net/userfiles/files/nuwugosu.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/39764844680.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/97538207937.pdfIn PDF document text
    • http://caytrong.vn/Images_upload/files/72953395517.pdfIn PDF document text
    • http://rubensova16.cz/files/file/magilepemawakediralijag.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE668 11004 bytes
SHA-256: 5399e70c0bc062865ba0327979bc2d0b7c33bdc7049697f5b9ce27d69effcc9a
font_02_sfnt_off0000ffbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBB 17488 bytes
SHA-256: fff149b5b3443bf136eae469831705eb53fce30a87decc0f3115f565ca9fd8ff

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