Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd0775e1d79bd5d1…

MALICIOUS

PDF

80.5 KB Created: 2021-09-11 04:18:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 35481507789e5a2afa21d62b4b4f98de SHA-1: d27d254b7c67b76a8eedccee678e78db8a5a23ac SHA-256: dd0775e1d79bd5d1d35485380fb4babf835e835c9176b778c6c456daf1bdf17e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. The presence of JavaScript suggests an attempt to execute malicious code, likely to download further payloads or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://yilbasipromosyonu.com/userfiles/file/panuxemumibasosewejur.pdf In PDF document text
    • https://lanegarrett.net/userfiles/file/vofajogakumavurivuwizeku.pdfIn PDF document text
    • http://bftt.marketsearching.com/upload/files/57526116774.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/53879533947.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210906043633.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/gulisuwafimizunu.pdfIn PDF document text
    • http://geotersrl.it/file/venejowupisoliwi.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/48261347960.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613171b73cdc0---tonomiga.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210910053625_fogwlh.pdfIn PDF document text
    • http://thechitay.com/uploads/userfiles/file/63826041918.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/60883d93e3152c7a51ba53e4bd414bf7/55492529211.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/pamakukevidiwinazamujote.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/ruzifuna.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/76c8447bbf0b9285b902757ee284de55/51188642666.pdfIn PDF document text
    • http://friend5190.xyz/js/ckfinder/userfiles/files/vekal.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131021a3b5a7---55341344057.pdfIn PDF document text
    • http://lifebeachvilla.com/uploads/image/files/66369219994.pdfIn PDF document text
    • http://szwygs.com/upload/30760587619.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/jojabalezubif.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/5f996ad89014bb70a6e4be6976297f6b/rubaxililanajifizifetixej.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/labimedatipomad.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/1349313859.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=menu+button+apk+download+2.1+5PDF 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_off0000d4ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4EC 17980 bytes
SHA-256: 0588b86e76b449c95c49f13cce651fdb5db8cd288589cf0aae03064f99c6efb5
font_01_sfnt_off00010387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10387 10808 bytes
SHA-256: 517d0d6c23beafe883a055aeb1a7169cf2dc8d18e5473e65c5e71f3d35327ea4
font_02_sfnt_off00011c96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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