Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2c27fae1e548cc5…

MALICIOUS

PDF

77.5 KB Created: 2021-09-16 02:26:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 41e356e5bfcea2fad4fedd941df5ce46 SHA-1: 71ad07cb52d3665928bf824234825e6b3c5e7432 SHA-256: a2c27fae1e548cc50c084ed6f333e7b957aee2f06ca6e3abbd60bfee42c770be
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript and numerous external URIs. Heuristics indicate it functions as a link farm, with many links pointing to compromised CMS uploads and disposable hosting, often utilizing UTM parameters for tracking. The embedded JavaScript and link farm structure suggest an intent to redirect users to malicious sites, likely for phishing or malware delivery, aligning with the ClamAV detection of Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://pistant.ru/uplcv?utm_term=free+skins+generator+fortnite+ps4 PDF link annotation
    • http://etoprosto.ru/ckfinder/userfiles/files/mapozovufuwemo.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/d0b823d3c0aeb45bd1adb865f948f8cf/14976914334.pdfIn PDF document text
    • http://fabtur.ru/upload/files/pozokolebasutujutesufer.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/9bgpr29c87h2jm9dvv8768cm0b/64304843162.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/10922718467.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/82557330817.pdfIn PDF document text
    • https://zagorjeadventureteam.hr/files/falupapo.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021090222320432.pdfIn PDF document text
    • http://svenskafik.se/uploads/fckeditor/file/xodusepu.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ee50d1d76---81866032358.pdfIn PDF document text
    • http://inbiosa.eu/static/cfiles/files/xuvaxesowexax.pdfIn PDF document text
    • https://ghadir-eng.com/userfiles/files/kopunus.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/32658219551.pdfIn PDF document text
    • https://phuquiland.com/upload/files/21067258202.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021090709182580554.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/kediduxiwib.pdfIn PDF document text
    • http://kbidc.kr/upload/editor/file/1630859584.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a21fc26246---53816302126.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/87464938185.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/dunivemilijagi.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/milufuxeluza.pdfIn PDF document text
    • http://classtool.info/upload/files/36105970909.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/63050647655.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_off0000c727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC727 18460 bytes
SHA-256: 96d7833410cabc78d3de1e1e8370067842d9df179832625c69c34d23d97cd5e7
font_01_sfnt_off0000f769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF769 10636 bytes
SHA-256: 0f524c46641b1c33f82acce0c876dccb5531db308918e6b6bac0cdc15cc31acc
font_02_sfnt_off00010ff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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