Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb54bc66788c16ef…

MALICIOUS

PDF

81.3 KB Created: 2021-09-07 07:20:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 57be84cc5075414a80153536731355e1 SHA-1: 4f02a89af725c6cfd529f96a476a58e957675f48 SHA-256: bb54bc66788c16efb570275ed94023fcb73cb732cfbcd0ffeb30252ae1e4e7e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute phishing content or further malware. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a deliberate attempt to create a deceptive link structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://crewmak.ru/uplcv?utm_term=homelite+46cc+chainsaw+manual PDF link annotation
    • http://paliukenas.lt/i/File/82299668235.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ccf252f1ec---15280525540.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c009d05cc---48859501833.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/38450151254.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/muivk8vu2qsmr0ttr76igo5vq2/83266236403.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/81903f70cca6ea73c4144aa8160be277/bikune.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/38284259041.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160906205099ef---60033961342.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/63630388063.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/db39ce1464ee21cd9fbeca4529685b7e/39957909146.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/c374a6d0ca86e9e5179bbb93b4f789fc/jopakawuzi.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984e644b3ce---7671586490.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/43651854292.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/99cdcddec316f22d4b893ec4a70bb91c/kowapojutakidipus.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1626689823.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/bulixopaluniguvew.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/vitofewuxarujosiwuluguz.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ede81a50f5---43062801117.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/im5fkvfsujpl2uumui3ch11475/vatikoligatibefadatururi.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/0b1b5b23138064b4cea1865e53b0da93/davosegit.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/20254433924.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://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_off0000dc11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF428 10820 bytes
SHA-256: f2b4070e9c957738a2afaa6a275ef37052f41a5cc1a31e4c8dab081ac4da640b
font_02_sfnt_off00010d00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D00 17924 bytes
SHA-256: b22280e51a1a88aba20e80e9d85f5eb44fd5fd5c821052a1f49978b831b6f1e1

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