Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1ffd7ab2d6f9e61…

MALICIOUS

PDF

83.5 KB Created: 2021-09-01 03:56:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: edcc929e3444912784ad19e9b8ad8c98 SHA-1: 5542084f2e945e4b70532c4daaf4f3322a653886 SHA-256: a1ffd7ab2d6f9e6134b1801c108b13424164c60dd46dac1d2f55b9d1c570a7bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised WordPress uploads. The presence of numerous links and the nature of the detection suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://hr-serdahel.hu/images/file/fejetaviv.pdf In PDF document text
    • https://mamo-tato.ro/userfiles/file/kopofalanilaxixeganexo.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/mitiseju.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608572b7ebc2e---52180500428.pdfIn PDF document text
    • http://skikk.nl/app/webroot/files/userfiles/files/rifoluzaludusad.pdfIn PDF document text
    • http://milkexim.ru/imgeditor/file/77499918887.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9aac63fff---xarazapedutatuvexo.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa6d8ab4a1---sesupinedigekuzarojigun.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/febejodatasodop.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/c6hf0m6hfdfsbv6uq1969ose80/potufoleraw.pdfIn PDF document text
    • https://egc.ecrom.work/syo/files/96562576268.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087560fd1ca4---2471931060.pdfIn PDF document text
    • http://altinay-law.com/images/file/wirawoxa.pdfIn PDF document text
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/pizumujov.pdfIn PDF document text
    • http://www.solarwindependence.com/ckfinder/userfiles/files/mavug.pdfIn PDF document text
    • http://deshdunya.com/blogimage/file/puvuduredususa.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/96219120598.pdfIn PDF document text
    • http://indianspringhomes.com/userfiles/files/59672902171.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/10549505744.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/12848731034.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/ditadafivuvoniguwima.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/63205135251.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095d3b25afe2.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/sezidila.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=modern+periodic+table+structurePDF 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_off0000e31e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB30 17312 bytes
SHA-256: 01e533c73510b71471bd8da772e8c55de15fb73ed52b8e51eac44e56d75005bd
font_02_sfnt_off000127f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127F6 10740 bytes
SHA-256: cc38a4912ce1e8ffe87de10777da9cb61a497f077940fa39fce7014c8ea0ddd7

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