Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ee2f5f0d031c1f9…

MALICIOUS

PDF

82.6 KB Created: 2021-07-02 00:14:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8f36e04a155de8c3e92dd1209d817cc0 SHA-1: b69cd41ad3e098d36a40dfc2b2e0789cc8d33d67 SHA-256: 2ee2f5f0d031c1f90485730907d8c28c2ca99b8f1bb970a5a8c800b42170262b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload storage locations and other disposable hosting sites. The primary URL, 'https://coretry.ru/uplcv?utm_term=sample+letter+to+confirmation+candidate+from+sponsor', suggests a phishing or social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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=sample+letter+to+confirmation+candidate+from+sponsor PDF link annotation
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16089198b175b5---vavepogodudiseronun.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16093fe2e61ef4---18047866133.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/wakub.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0beec2db2---napuregiwuropizaz.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/janotagugapufofuvovo.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ce16a472f---33253175925.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/fivuj.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/ff46d0bff712f936585a91126f38a0bc/wesopitozizarakelubuzus.pdfIn PDF document text
    • https://umartravel.com/files/boboxodijodofeponuweni.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/c18deb4166e309224e9b5b0edd31a66e/19176216759.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609800157cd0f---firikowakijuzaz.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/949d4ad9a3045e65490d48f9ec9b3a3e/zurufafofemadakevuxajebom.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/586f9c016501dae7deed486dab5dd5cf/30591598970.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/62931074502.pdfIn PDF document text
    • http://pressvaluation.net/userfiles/file/luluvu.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/xekosevimowotejupegubave.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7fb3dc944b---xofezorowagufageke.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/35621602604.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/g9mi868ncu0panslepn75rtben/86043841761.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/59e60454116a9a0a3a75f385834c4bd2/romupazekoxowodelumuxabe.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021060800213773.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_off0000ddf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f60d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60D 10856 bytes
SHA-256: 6f1b9ae35da473296bf047268c68bfd28c540409253f2e867bbc74c7cd4fb6a7
font_02_sfnt_off00010f06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F06 17624 bytes
SHA-256: d7b6731248f08732d041f4d958de6b5cdfd50ce188f45cee3e9753fc0b516bf1

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