Malicious PDF — malware analysis report

Static analysis result for SHA-256 7be6dff5f885ade9…

MALICIOUS

PDF

82.4 KB Created: 2021-08-06 21:30:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a40ea0260d7eca724a4b11d13ca6331e SHA-1: e77450ded03c6a6efd1bec21f44aa2830961f52d SHA-256: 7be6dff5f885ade90326cad4c35e23eb8141e1936c99087ed868f11c85589b0b
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample contains embedded JavaScript, which is likely used to exploit vulnerabilities within the PDF reader or to redirect the user to malicious URLs. The presence of numerous links to compromised websites and a heuristic indicating a download button lure suggests an attempt to trick the user into downloading a second-stage payload. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://drafthe.ru/uplcv?utm_term=thermal+expansion+worksheet+doc PDF link annotation
    • https://tecnibat.net/uploads/archivos/negor.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/a828562e89998d772ede768b7dd0e403/62734853322.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a78378dcb---fakozelomakenox.pdfIn PDF document text
    • http://prosquash.by/data/22959478975.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/t4lf8fd97fpvupu2tke89gbqvd/52741538313.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160713be1b77a5---rozodug.pdfIn PDF document text
    • https://jagominum.com/contents//files/57743912157.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd73db2653e---kefilefavozuwaperuf.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/mpvndm8guklfk0jmm8ci4f3b09/40095549234.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/kovuvomotebugazabox.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/ikovizazusozuvuf.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b83d149bfc7---92047291378.pdfIn PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/81717359341.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210506003740.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/jns8iju6ddb83egfoc04tr1mfd/rinaguvigile.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/rexaziwutatokoxudixoj.pdfIn PDF document text
    • http://redactron.com/userfiles/file/25613573827.pdfIn PDF document text
    • http://ridendo.cz/files/file/86959860474.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/elepq6m3f309k1p5pv8o2irmr6/42532501074.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/b02ee812d85bf727da6e290aaaa9a76a/nimebaxa.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610445adf37b4---52168463627.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210620214342_p2wp68.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7b5d778b6---58998537188.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_off0000d610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD610 11024 bytes
SHA-256: eb097b58aa885472ff0cd3988d1929f2bf6e3cf21944b45b8e93442de58de2e6
font_01_sfnt_off0000ef97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A9 18928 bytes
SHA-256: 42e29b38fd68e819128137d4ba0a3fd10ed05420e6a84f731f7dc85a9678092a

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