Malicious PDF — malware analysis report

Static analysis result for SHA-256 444e2ca7598bcd94…

MALICIOUS

PDF

88.8 KB Created: 2021-07-13 06:55:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 9a38ae6c6369ecf8bfba1ae13bb8815d SHA-1: 61bcd70f4e7e42aa6d988f79b7bb648e2c6a907d SHA-256: 444e2ca7598bcd941d2a9ef2013b6fa1dfbd7c4dcbcf08effd4dda41539cd638
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The presence of embedded JavaScript and a high number of external links, many pointing to compromised WordPress upload directories, strongly indicates a malicious intent. The ClamAV detection and ML classifier further support this, suggesting the PDF is designed to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fertilizergranulatorprice.com/d/files/61634893690.pdf In PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6ede0af73---vexurerokasipixosux.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c7fd7592f---pelurujorawi.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ba9edb3f9---wekog.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce44c4f4a3---kekanenozitikina.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebaf80d70a---88781770237.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/5e4ecce864787b223a5fd32996af2b7a/65221689953.pdfIn PDF document text
    • http://fly.no1-yes.com/userfiles/file/32580630804.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eab21ca0ab---59669458491.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/munokutejonemo.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/45764818203.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/3773064798.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/sajebavowebuvew.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/97377609669.pdfIn PDF document text
    • https://speculatio.in/ci/userfiles/files/37493203809.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16099ace400361---taxagibupimivewo.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/673b22ab6c3b6e7a63a066a47fb68513/pixexigeso.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/fokasulosezaxu.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/41d656f5d7f7f42a7aab04d0f333d144/robamefosamapiga.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ecc70de5737---6746596587.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f38545998d---59955699294.pdfIn PDF document text
    • http://oilandgaswork.com/userfiles/file/kotekan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=a+bird+in+the+bush+is+worthPDF 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_off0000fba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA6 16468 bytes
SHA-256: 4743c5b1cd173645fe358dce78dde47931a87bd16dd1e15402d8294b3b7f5364
font_01_sfnt_off0001266a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1266A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E81 10444 bytes
SHA-256: 6a9688d07a4515d60c2d8f064806c5abdd4e10109a3e5931a99b46d0ee6ae254

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