Malicious PDF — malware analysis report

Static analysis result for SHA-256 343953ad24e77332…

MALICIOUS

PDF

90.3 KB Created: 2021-09-13 20:35:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6cabf2844d89e78223fc38e9bf4ecaf3 SHA-1: d570ac57e6cfaae1871641a42e17185fed08e597 SHA-256: 343953ad24e77332e9b3845b2b372a879e3532fd70d3e7d961103cdcc6f2831c
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 or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm, likely to direct users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, consistent with phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://archism.ru/uplcv?utm_term=nef+elementary+workbook+pdf PDF link annotation
    • http://agataklimowska.pl/userfiles/file/20679030431.pdfIn PDF document text
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/84438397892.pdfIn PDF document text
    • http://novafish.it/userfiles/files/mifopodo.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/nifotob.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/7671195849.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16137c0ed63f3d---xazor.pdfIn PDF document text
    • http://gmart-express.com/demo/uploadpic/file/fuxirosoxotafetovepuwefo.pdfIn PDF document text
    • https://mytshirtcreator.com/app/webroot/files/file/wumakixesofezawidadoladez.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210904/file/nedebuxuzin.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/69566018439.pdfIn PDF document text
    • https://gameadvisers.com/js/new/fckeditor/userfiles/file/62155778017.pdfIn PDF document text
    • https://gazeta-msp.pl/user_files/File/newinipekupelulena.pdfIn PDF document text
    • http://wx-bm.cn/upload/ckimg/files/202109080310214424.pdfIn PDF document text
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/13428963470.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/25054108553.pdfIn PDF document text
    • https://phuquiland.com/upload/files/55199847480.pdfIn PDF document text
    • http://touristclub.in/userfiles/file/51230540958.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff7d3e5a6b---ridusopo.pdfIn PDF document text
    • http://yidaig.com/uploadfile/file/20210913131406.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/79926656177.pdfIn PDF document text
    • https://semangkamerah.com/contents/files/junozuju.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/161316a6e2df42---julobojafabi.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/163072914190749755433.pdfIn PDF document text
    • https://cultureresortpokhara.com/assets/userfiles/files/sopunagolow.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/digawisami.pdfIn PDF document text
    • https://gtijsr.com/userfiles/file/kosisezutuwuwovoponeze.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_off0000fb77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB77 18252 bytes
SHA-256: 38ee35013dcd104c77a547eee40b4f411767546b2fade97a68d7419f51d11322
font_01_sfnt_off00012ac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000142d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142D8 10808 bytes
SHA-256: 5fcd340f43b95a6f6e16c6b1d859001aba0aa120b0cd8d9c4c0d41c3075b1e39

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