Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f87b59c393efc0f…

MALICIOUS

PDF

81.3 KB Created: 2021-09-07 13:58:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2105aafe237999450c9ef81995607632 SHA-1: c47655e535c9a1b4248ea29986437f48f576f554 SHA-256: 6f87b59c393efc0fafc3e9ea119553b17de9c5f3f08269c7a55752aa2c474582
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised websites or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving the execution of JavaScript to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • 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.
  • 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://laborke.ru/uplcv?utm_term=cimline+magma+230+parts+manual PDF link annotation
    • http://jcon-aps.dk/userfiles/file/suruzed.pdfIn PDF document text
    • https://sanagustin.cl/files/97519842546.pdfIn PDF document text
    • http://herve-coiffure.ci/files/tixit.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/9ffd3b1fc4effa96d27b334e2b6f9ee0/83598415063.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092bc137e373---belorilulatojurar.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e937529b7---mevawudapalufidiba.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/53u1kacedmgke7n9ic7gekgqlf/14648351097.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/lofujem.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a35a3c32610---45983276666.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16099fe8481a4c---7550860436.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608d30dec9c8b---7360236426.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/zavizoxe.pdfIn PDF document text
    • http://ohsclassof73.com/clients/9/9a/9a21b0b253f7c4eafe662346d237c286/File/zejerizabipejoxov.pdfIn PDF document text
    • https://santechnikosdarbai.lt/images/files/lorexivefademebugajo.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/52755903733.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/66721449605.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/tipupufusolugobi.pdfIn PDF document text
    • https://minervatech.work/js/ckfinder/userfiles/files/xebatud.pdfIn PDF document text
    • http://proxima-design.cz/files/file/zimemabasejod.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/61345117840.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/52334340037.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/ziperod.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/65337190617.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/79359394966.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/7314tsk4egmdi9fcgi8jmuopk9/jejabukikakibunidaxux.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/f5f5103979a013810f0f71f22037ef57/78646568561.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/niwek.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_off0000dc68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC68 16112 bytes
SHA-256: 2c0831566c7fac581612212e3344dcefde7c195a0692de623fd6e403cf9c981c
font_01_sfnt_off0001059c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059C 11020 bytes
SHA-256: 4d44291caac3c86c08285c350014ccec1552c51474290c8b659b71d455f4d6d6
font_02_sfnt_off00011f4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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