Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0b2f5c6cd56467e…

MALICIOUS

PDF

80.1 KB Created: 2021-09-19 01:22:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 98f7a9c65a8b970ba303c19974dce8d3 SHA-1: ef2ee7731256cf25e17acfc1ade6ed9613f6aae5 SHA-256: e0b2f5c6cd56467ea6951a41d0aca9ca1e36f18441febcec76750b5341022029
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and numerous external links, many of which point to disposable hosting or compromised CMS uploads. The presence of a 'download button' heuristic and ClamAV detection strongly suggests a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the download and execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://chcial.ru/uplcv?utm_term=firestick+sportz+tv PDF link annotation
    • http://thcsnguyenvanhuyen.hoaiduc.edu.vn/ckfinder/userfiles/files/30443536241.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/80645447001.pdfIn PDF document text
    • https://sunsetlearningcenter.com/userfiles/file/kajakonojazakogivopuman.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/3846538051.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/jegesujuxokezimogov.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/liritizefuje.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/zipijizavuxanojavodamuju.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/zeluvutiwelavoju.pdfIn PDF document text
    • http://huyndaicaudien.com/upload/files/76075804205.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/23337825703.pdfIn PDF document text
    • http://royal-pizza.eu/files/file/mogijipogewimumakumumu.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/rejate.pdfIn PDF document text
    • https://kvzriu.org/images/file/3069603611.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/jajibevorutifiseni.pdfIn PDF document text
    • https://rm-parketi.si/uploads/38721417745.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/xasowotolirumaregenix.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/36827554991.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee6a0d1806---75613962326.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/38331640388.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/zukexipawuxaxa.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16130f2112b326---97717713706.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/9cc6bfb829f7ae50aee23fa811894edc/52593245955.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/zakokaxes.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/lirisowafuwodegusaxuwuke.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_off0000d5c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C6 10252 bytes
SHA-256: a0cf4112610a1188f635e97620c3f338c6eeb75c7ac0f98f54ade20d1b6b58bb
font_01_sfnt_off0000ed08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001051a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051A 17676 bytes
SHA-256: 2732a2e39d81e89109d3374a662703c9e0a6ba0ea53ee28a03c368a06dee12b7

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