Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f35cedac56fe726…

MALICIOUS

PDF

81.0 KB Created: 2021-09-06 07:48:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a7ba57e9698a1ea2cfb0e459ef79c1cd SHA-1: 450d48331a360d94d1c3fc023aef7d0bdb01163d SHA-256: 4f35cedac56fe72632aa2288345f3c75e7d7948a40df238f567464a536296a05
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The document contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to compromised websites or phishing pages. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://smidgel.ru/uplcv?utm_term=economic+times+pdf+paper PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf53ccc6dc---76597776876.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/98b172973643e1465e479d76d348e08f/60966615970.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/eroc7l8cr7ra06rik90bbj57q1/tomajeximomolenewad.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/48498436862.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/803aa7f1b0161b1ba54fbd4999ca00b5/lepexakolibitalawax.pdfIn PDF document text
    • http://goodslib.com/userfiles/file/83586101736.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021090204344629.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/99870176380.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16070fb58aaf71---85933433617.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608610d18d5e7---55418248616.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0886665aa6---75934125902.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/dubelizebunetepik.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/wizalojesenegesoba.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/4033112930.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210827_020614.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/favajojoj.pdfIn PDF document text
    • http://peter-crooks.com/userfiles/file/26165244574.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/phhmkfo0015h634qrvbtce1ms2/200567957.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609869e3a26a8---10153251613.pdfIn PDF document text
    • http://bischofs-scheune.de/userfiles/file/nefegakagejovetumegosif.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/29172243146.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_off0000d88d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88D 10720 bytes
SHA-256: ac11ee53ce439289e766bdf4743973f09a15ac078d74af04911145037086bf25
font_01_sfnt_off0000f123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF123 17756 bytes
SHA-256: e49990f5c8c10331b469bd1028365f10f035e9931e72a56cacc7a47751bedff0
font_02_sfnt_off00011f01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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