Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f07e44a9f985181…

MALICIOUS

PDF

110.9 KB Created: 2021-07-22 10:47:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 983f714ba0609511639b2e8cbcc6f9d3 SHA-1: e3caea93e67d9efc80cc51156f4725532573b99e SHA-256: 9f07e44a9f9851811637c2d77477b7537c0f3b5d51402b74c6881a89cf6687d8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. It contains a link farm hosted on multiple websites, many of which appear to be compromised WordPress installations, suggesting an attempt to distribute malicious content or conduct phishing. The presence of numerous distinct hosts and UTM parameters in the URLs indicates a broad distribution effort.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • 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.
  • 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://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c637c88bd---tixopuwux.pdf In PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c41c3149b8e---90061531040.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607f898f2a6f6---kifire.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080863f1ab52---95833267309.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/59958800345.pdfIn PDF document text
    • https://artbynela.com/uploads/file/jupepepapogifoten.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a90b2ede5---lukapokizowibav.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/bupejuger.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/63057547114.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/6a92fc9b90317a0ad55fae2c2cb790e1/wafisido.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/qlqpbkmk97htd9cmigt19ldl7j/52360170247.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/vasugifaminulosizubu.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/87ceb8ab7067a31b3bb4105045341a1b/52498171509.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/moditaxozom.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/ad4e5ed36caf61b83dbbbc8909b5dbd5/bajexujil.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094570b2eb45---59080870103.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160777c1ed4ebe---tabope.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094e986672b0---93361197517.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/otrl90fl470861tpgj48dcekjm/31457950919.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/e4r8rfdvsibj4ug2h788plg9hm/4714320068.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/f44685efa070a04a1b184fcde84fbc03/83950545297.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/c7c04224e4844a21436af4a1896462ad/42768866863.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/32317682432.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/40aa23450adf37fa1ec331d391b3b420/33459519046.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=overture+to+candide+score+pdfPDF 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_off000146cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146CD 20648 bytes
SHA-256: 31e59fbd1e44d6d4490da882cbdab474080e051defb3205248149eb6836a0dcb
font_01_sfnt_off00017bb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17BB3 10756 bytes
SHA-256: ca66247872d99709c70f6315d46852e6ffb78b3bd831321a7af51a6e68379479
font_02_sfnt_off000194a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x194A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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