Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ac80d6a4757bce2…

MALICIOUS

PDF

100.8 KB Created: 2021-09-04 09:47:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2eeac560d9ba671b9885797638f05f9d SHA-1: 4046c103c7d5b685ed7111f805e6b130346377d9 SHA-256: 5ac80d6a4757bce226cf84bedca021fc7dd9d0c6ab2b35c37238221dd938982d
156 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. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to distribute phishing content or malware. The presence of multiple external URIs and the 'link farm' heuristic strongly suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/7f5ef0337b24cca102f9a9bec72b3d17/49915419511.pdf In PDF document text
    • http://polimak.pl/userfiles/file/suwubusoto.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/0266287bd849e558007d7734426d6a65/61368468309.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609d41cc331cb---belapopudomiruwumud.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/59166324935.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/52268944015.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/36641834183.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/fag81vld9ird09ms53tk1p6lu7/33054568930.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160e21e7d2393a---67217233906.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c131377ffa---navusivuzoselowom.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160763d887d070---65987470806.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/tebilumumumoro.pdfIn PDF document text
    • http://kukubara.com/zdjecia/file/sajakamebidobilenaz.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/7ec3351481cb08424cc2ac5d7613dcba/5171321670.pdfIn PDF document text
    • http://sbkf.org/files/files/pixowuvujatinebopeso.pdfIn PDF document text
    • https://cooperspick.com/files/48454939339.pdfIn PDF document text
    • http://tcurryproperties.com/konadnew/userfiles/file/dikovowoxamanemexowusitas.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/vojaxijokafodasi.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/3f42002c266bfc2229267087f8aec39c/menonid.pdfIn PDF document text
    • http://starlightcelebre.org/clients/4/43/43e9139217482d7666ce300faf566241/File/jujusuli.pdfIn PDF document text
    • http://heizler.hu/files/file/radasakezopatozufuwe.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/4d2358a574c80cdde0d34a0f27a20a85/20626774594.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=quality+assurance+interview+questions+in+automobile+industry+pdfPDF link annotation
    • 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_off0001208d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208D 18868 bytes
SHA-256: 7771332ee55493b3e9aae5a89b8c4774891f3e3e9cfb70e3a16dc69990857887
font_01_sfnt_off0001518c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1518C 11492 bytes
SHA-256: 530f81b4ccab4f795c8e2700eb4ba195cb20a54cb7a8a19e691298bceb37d71f
font_02_sfnt_off00016c7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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