Malicious PDF — malware analysis report

Static analysis result for SHA-256 df55eba82a5ede8a…

MALICIOUS

PDF

77.8 KB Created: 2021-09-02 07:36:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: acb3b9ad3dcf6f50b0949ab325be343c SHA-1: 4b6ddedd62303832e9d4d734b6b6c0cae4f88e42 SHA-256: df55eba82a5ede8ad3d4863c95eddbb0fac01fbc8876ffa9b3d908b9597abc69
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to compromised websites and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it's used to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160904c1a15fcd---33166825377.pdf In PDF document text
    • https://artigianoteca.it/file/modalujoparazimolevew.pdfIn PDF document text
    • http://altinay-law.com/images/file/89562176448.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/56274910534.pdfIn PDF document text
    • https://etimes.mn/uploads/files/wusabubodewuwubusuriva.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/49127291888.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/fijakol.pdfIn PDF document text
    • http://shavers-boles.com/clients/7/73/73b1ad2e2c85410b7b015c0c79a6caf4/File/vubujaniwod.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7420b292d---beneposuxibu.pdfIn PDF document text
    • https://magnificenttreks.com/userfiles/file/lirezefafubeborupuso.pdfIn PDF document text
    • https://immo-macedo.lu/userfiles/files/70091538117.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/bcd31b3f3d3b3239d3541dd436d96a89/40012692182.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/89c212ea1ac76e15dc8775b3931976fc/9786982681.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/pivikukari.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd1dbc2ed5---pirupofo.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/31637898374.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/68247900310.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/zafipesuk.pdfIn PDF document text
    • https://chornakorn-packing.com/ckfinder/userfiles/files/21274568363.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/76617321269.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/bixegofixudibojo.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/zimituxabode.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/gorovofedo.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da20cddb4ce---gugeriwufederiki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=grease+manufacturing+process+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_off0000cda1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA1 16284 bytes
SHA-256: 1be939f988b9060ce5f09d44744372f4e9b358be375abb0e41d47f95ae94f053
font_01_sfnt_off0000f740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF740 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F57 11056 bytes
SHA-256: d53989374ce9e9d80e8878b3684fc4ed216625b44f10e47c9c4b6d0e448ae5dd

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