Malicious PDF — malware analysis report

Static analysis result for SHA-256 3923a612cc2b47b0…

MALICIOUS

PDF

80.9 KB Created: 2021-09-17 18:02:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fa29744161f05ff02dbfd4f2fed2b417 SHA-1: 2741a076cfd851bc2f6bf165bec81f8540764217 SHA-256: 3923a612cc2b47b0adbaa67ce3c48f40a9bced0c7c9acc546b2c6a7960d2e2ff
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting, suggesting it functions as a link farm for phishing or malware distribution. The presence of embedded JavaScript indicates an attempt to execute code, likely to facilitate the redirection to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://synerhu.ru/uplcv?utm_term=redeem+robux+pin PDF link annotation
    • https://tierlistei.ch/downloads/mevamoliwokezuj.pdfIn PDF document text
    • http://paneldeconso.com/userfiles/file/pejegakifevoz.pdfIn PDF document text
    • http://ipceurope.com/assets/file/vebijiketorosajezoxusi.pdfIn PDF document text
    • https://subarini.ro/mm/file/15888100375.pdfIn PDF document text
    • http://frappsreagent.com/upload/files/64621056361.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210917_D1A6E849920CA0EB.pdfIn PDF document text
    • http://uteambio.com/upload/files/16751608603.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614217da78c41---labelijiwafevagawukubama.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/2021942242578102.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161410f330122e---94546685432.pdfIn PDF document text
    • http://sasmedm.com/www/js/ckfinder/userfiles/files/kojulutof.pdfIn PDF document text
    • http://arsvet.ru/img/upload/giwesulibofaleleseju.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/fumunejutuguvexaxa.pdfIn PDF document text
    • http://ermolino.mebel18.com/uploads/files/63587435238.pdfIn PDF document text
    • https://madeinstlucia.com/userfiles/files/41521051537.pdfIn PDF document text
    • http://bagodilovaspark.hu/userfiles/file/56502869885.pdfIn PDF document text
    • http://fmmvn.net/userfiles/files/suvalafabebilipabipuxejad.pdfIn PDF document text
    • http://abpjse.news-read.com/upload/files/68554016228.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/87490005616.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16140c69a27e26---963518085.pdfIn PDF document text
    • http://koreadramatour.com/FileData/ckfinder/files/20210916_A6FC38633328772C.pdfIn PDF document text
    • http://www.tempshift.com/app/webroot/files/uploadimagesfile/jotopotosafojak.pdfIn PDF document text
    • http://sirinthepgroup.com/userfiles/file/naradodidetaxetus.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/d504a6746d826f0a2c59f96d5da13ae2/fatojogininewo.pdfIn PDF document text
    • https://dnsbp.com/all4help/fckuserfiles/file/58702911896.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_off0000d7f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F6 10468 bytes
SHA-256: dead866f8befe9c566e9bc55037cbaabbb709802a1aa60d3de09bbeb0995ca49
font_01_sfnt_off0000ef63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF63 17980 bytes
SHA-256: b58076de8ed6753043acf48c18634dc61837cac3c5adbf8e3266ae9ee7c1ac7e
font_02_sfnt_off00011e18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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