Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ecd051e89d701a7…

MALICIOUS

PDF

88.1 KB Created: 2021-09-17 16:04:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4cb7030dcffdde23efcd4b451bda5c73 SHA-1: 3dbe8d3ff3cc486ac0ac143f28cc5d6e5e68d3ce SHA-256: 3ecd051e89d701a74c9eb7ab7e9dbbaf5a00e73287cce3c70637f3a814714ce8
204 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external links, some pointing to compromised WordPress sites. The critical ClamAV detection and ML classifier score indicate malicious intent. Notably, the document includes a lure to copy/paste clipboard content into a shell, suggesting an attempt to trick the user into executing commands for payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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 http://vipforiraq.com/userfiles/files/sorajatuzajelatejaw.pdf In PDF document text
    • https://drivetripper.com/userfiles2020/files/77628111047.pdfIn PDF document text
    • http://viettruss.com/upload/file/78312368474.pdfIn PDF document text
    • http://sprostredkovanieuverov.sk/res/file/84199759873.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/eaa1b36af7803230a98971f5cc91910a/pinijijokuzod.pdfIn PDF document text
    • https://nexapos.com/upload/files/50563985025.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/48170122092.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/relujono.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/monemajonaliwoxopiw.pdfIn PDF document text
    • http://seychelles-resort.com/images/blog/file/94022138618.pdfIn PDF document text
    • https://giyimkent.formenemlak.com/upload/ckfinder/files/15454708884.pdfIn PDF document text
    • http://tycoonmedical.com/userfiles/file/gopofemifejunarakenedozes.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/48448357899.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/72a06fd3f47f7b0d540134217a7cd2a7/fagixazevorep.pdfIn PDF document text
    • http://bodemveenweiden.nl/bodem-veenweiden-img/5432060006.pdfIn PDF document text
    • http://salamatekhanevadeh.ir/ckeditor/files/files/89588338792.pdfIn PDF document text
    • http://addisonplaza.abwingsmd.com/uploads/files/87089365978.pdfIn PDF document text
    • http://www.msjcongregation.org/www/js/ckfinder/userfiles/files/38417993857.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fad3e52513---88118950882.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/ridafezeruseladoxepugisem.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/wusesezibonazizavofefu.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/98f3276719a640ac48b7cc612e4452be/33269003548.pdfIn PDF document text
    • https://alev.az/userfiles/file/99381031213.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=dvd+auf+android+kopierenPDF link annotation
    • 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_off0000eeb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB8 20408 bytes
SHA-256: 2af4d5e03698c2c19f5ea9149d4dd6299ed3fd81b638e86289b38b37570bdda0
font_01_sfnt_off000122e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E1 10436 bytes
SHA-256: cffc4f80eb5ca106741077a9b31d2023642fde3831dc0dac6e815c7e5f23a617
font_02_sfnt_off00013aa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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