Malicious PDF — malware analysis report

Static analysis result for SHA-256 15a7643828cfe049…

MALICIOUS

PDF

75.8 KB Created: 2021-09-14 01:51:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b561960acd0dcda74edd86c3301be52d SHA-1: bde99582b3bdd35f45f9913757e5029442b53925 SHA-256: 15a7643828cfe049f2638658e93876cb508f6aa64d8424003c24134dd7914b1d
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection, indicating malicious intent. The 'SE_CLICKFIX' heuristic suggests the document employs social engineering to trick users into running commands, likely to download and execute a second-stage payload. The presence of embedded JavaScript and numerous external links to potentially compromised or disposable hosting further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://pistant.ru/uplcv?utm_term=how+to+check+chrome+deleted+history PDF link annotation
    • http://bancasemecanino.com/userfiles/files/segaxaxizeram.pdfIn PDF document text
    • https://samoinstitute.mn/uploads/assets/file/77530049891.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/dufabatowoxudiwinilozi.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/96681022013.pdfIn PDF document text
    • http://whuntex.info/userfiles/file/latipu.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/lugepaxosaninebomuxer.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613afd328bcd6---kedapexogejikusedeb.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/99242398054.pdfIn PDF document text
    • http://iphysiology.ru/upload/pumebot.pdfIn PDF document text
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/pobolebu.pdfIn PDF document text
    • http://wyadonline.com/userfiles/file/4787760658.pdfIn PDF document text
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/xilelate.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1631497903.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/10213154953.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/fugum.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/6774a9e85a8c7e8e90fda8625e006e70/gakinowaluto.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/19713301022.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/87473498210.pdfIn PDF document text
    • http://henskeschildersbedrijf.nl/upload/12745074392.pdfIn PDF document text
    • http://ziguratex.com/helpdesk/app/webroot/img/userfiles/files/pupixaneregejefuxifiwej.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/wigipuxibolizipojizenejis.pdfIn PDF document text
    • http://actinq.nl/upload/file/70044726857.pdfIn PDF document text
    • https://inprovit.com/ckfinder/userfiles/files/lidikabisi.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1612f351a56ba4---potifasadagofugizexovez.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_off0000c447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC447 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC59 17460 bytes
SHA-256: 2a729a37d7c54861594edef10a7bed02aa3762b5acb5b3fcb80366ce42c22ba9
font_02_sfnt_off000108fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FD 10652 bytes
SHA-256: db0570f1f4309dcb278fd1453fab18af25669bfe251889789865d5e97abc7cd5

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