Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cd77be2fe5bd243…

MALICIOUS

PDF

70.0 KB Created: 2021-10-02 13:46:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6770e5fc1647181a42e932ee4d7d92da SHA-1: 908372470ff9bf3da0658bc794eaac584fcf0043 SHA-256: 4cd77be2fe5bd2439645cb7cad4bd526a7a92f79411430593cf02312e205c526
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous embedded URLs that point to various websites, some of which are hosted on compromised CMS upload storage. The primary purpose appears to be redirecting users to potentially harmful sites, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://coretry.ru/uplcv?utm_term=llb+diploma+in+law PDF link annotation
    • http://riverhouse.at/pcms/content/file/jalorulura.pdfIn PDF document text
    • http://thinhhoanggia.vn/Images_upload/files/38882273105.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/161322dbbbd4fe---88068847939.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/id2f3s0shl90eisqppoel8tev0/2776356791.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/34e716190487977be33cd3f8ddf128ff/36835773066.pdfIn PDF document text
    • http://theclelandgroup.com/img/upload/file/67933596416.pdfIn PDF document text
    • http://pjteam.hu/uploads/25845734036.pdfIn PDF document text
    • http://pop-around.com/file_media/file_image/file/1955246480.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/4e7b88a686e4f75d9230b2603a865b3d/relise.pdfIn PDF document text
    • https://jobtiara.com/files/files/7251496030.pdfIn PDF document text
    • http://moretonassets.net/userfiles/nudatigoxafi.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/72742708394.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/85860097113.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/19520269885.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/fadedobuw.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/161403d8342ee4---molibekenurug.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/sojatalafirub.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-3/20210903231311923286.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/61379547496.pdfIn PDF document text
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/27093420735.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/botamedepulelibakinefiwun.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/f771c66bc87247c27e3b26d7397345a7/jogijudaxipi.pdfIn PDF document text
    • https://mrpressconsulting.com/UserFiles/file/rubarapulaw.pdfIn PDF document text
    • http://foreverymuslim.net/home1/forevev3/public_html/foreverymuslim/upload/file/betulomiralabutobapiba.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_off0000b33e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB33E 15884 bytes
SHA-256: b346279bec713287d79ff1c64a2bde8c9569a104e46af98f39825469415e54bc
font_01_sfnt_off0000db9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9A 10236 bytes
SHA-256: 6fe2dff38552ae9c5d63ed17bf037d62cda185cd842356da7d4e0f3b1db91c32
font_02_sfnt_off0000f23d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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