Malicious PDF — malware analysis report

Static analysis result for SHA-256 8618b2e95b4eb0ff…

MALICIOUS

PDF

80.4 KB Created: 2021-09-19 20:13:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 68a7bd6859ed10d5d1276629bb1e0c71 SHA-1: 82167ca78213c1a44a40538e6aef4fd27ec39ae6 SHA-256: 8618b2e95b4eb0ff8a42feb4d87f83eb3762951f365d63ef20ff0fe649124b28
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://pixomot.ru/uplcv?utm_term=android+freeware+download PDF link annotation
    • http://sntaviator.ru/ckfinder/userfiles/files/8206306550.pdfIn PDF document text
    • http://xatrbio.com/userfiles/file/10627170465.pdfIn PDF document text
    • https://kawanmto.info/contents/files/99625489841.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210908_236539706F665C50.pdfIn PDF document text
    • http://baove24h.org/upload/files/89954999596.pdfIn PDF document text
    • http://hbaoge.com/upload/files/28575110786.pdfIn PDF document text
    • http://giaydantuongphongkhach.net/images/news/file/tapefa.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/3665267487.pdfIn PDF document text
    • http://icaalliance.org/filespath/files/20210918110908.pdfIn PDF document text
    • https://tonerihned.cz/userfiles/file/zoxawidodekanokowitat.pdfIn PDF document text
    • http://rebornfair.com/FileData/ckfinder/files/20210910_1F8F3741D99DC183.pdfIn PDF document text
    • http://mp-journal.com/media/file/1922033947.pdfIn PDF document text
    • https://e-motorcycle.tw/upload/emotorcycle/files/toremiroxinidedunanivebod.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/39927774312.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/84241809126.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/jijepeteg.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161459b0b00448---16153499232.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/a6b0a79c708f7630d001360d3d996177/zesakaxememogiworesul.pdfIn PDF document text
    • http://termocity.by/pics/files/nonasopabiz.pdfIn PDF document text
    • http://gesundezellen.com/neu/userfiles/file/27580900999.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614722efa9b79---26950142131.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/lizisexagobudavegiwonize.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/161300415f0dbf---xuxaveberitamumadeg.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_off0000d8b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C8 17612 bytes
SHA-256: 1ff3f7d2756ba217b65e14db4b660335f83ed140aee7e61670ed0b9a00258e24
font_02_sfnt_off00011dad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAD 10148 bytes
SHA-256: a45dfcea079f264cc2683f9a55565516dd8c9d539e3450d2b70eca4177f3b5fd

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