Malicious PDF — malware analysis report

Static analysis result for SHA-256 57d0eafa7683300d…

MALICIOUS

PDF

87.6 KB Created: 2021-09-19 06:07:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 885936711a723b75c038b4d0db49aabd SHA-1: a65f4229f5ce8d0c60443fbb3c6c971e2d78ceda SHA-256: 57d0eafa7683300d6b551fd2a97d7723f1f680e1db30379b2592bff1bd995af6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on compromised and disposable hosting. The presence of embedded JavaScript and a high ML classifier score further indicate malicious intent. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://cructi.ru/uplcv?utm_term=copy+contact+apk PDF link annotation
    • http://newgatedesign.com/Images_upload/files/nutisupalerib.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/zadigukaxagupatumoruz.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/18357371281.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/52524338957.pdfIn PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/vuwugawonatotelaj.pdfIn PDF document text
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/36724568830.pdfIn PDF document text
    • http://www.smwiarus.pl/ckfinder/userfiles/files/50273162106.pdfIn PDF document text
    • http://mueblesdepladur.es/1/userfiles/file/14226844613.pdfIn PDF document text
    • https://fengshan-zhennangong.org/upload/ckfinder/files/litoxak.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/152a50212cad54255aa57ef3bab69781/77017738284.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/lixeguzopudufopetapipomeg.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a153e107ff---38827937388.pdfIn PDF document text
    • https://xylemleads.com/userfiles/file/89984517604.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/13414352555.pdfIn PDF document text
    • http://nbc.com.vn/ckfinder/userfiles/files/9032210830.pdfIn PDF document text
    • http://majstrissmt.eu/www-data/file/galatop.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/a2420d3cd323adef3abd4229ca76dbc0/korafatagilovefi.pdfIn PDF document text
    • https://jvlegacyhomerepairsmd.com/nbloom/fckuploads/file/gikevatapegofosazi.pdfIn PDF document text
    • http://robfredo.com/userfiles/file/61128816242.pdfIn PDF document text
    • https://afma.pt/site/upload/file/kusenu.pdfIn PDF document text
    • http://asliev.coco1490.com/upload/file_folder/file/bijuginasazo.pdfIn PDF document text
    • http://murzilka.biz/images/uploads/file/32595815725.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/09/files/210915155902.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/bibupiraruwazefawu.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_off0000f356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF356 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6D 10064 bytes
SHA-256: fd514bf984e8e1d7ec00a1cfe6874a8d0ee3c5c9fcabe6cf92b40812a6c889d1
font_02_sfnt_off00012205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12205 18016 bytes
SHA-256: bc66d18a380e87a88bf769ff51632beb35ea6f85610edd5c1a18f69ecfb16c96

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