Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f6bdabf3dc9d611…

MALICIOUS

PDF

87.7 KB Created: 2021-07-06 15:10:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: abc459f7696d2ca7d90444fbbcdafc1d SHA-1: 609099ce64c7d1db32267ae382467f3488b4cb7e SHA-256: 2f6bdabf3dc9d6117d2087077fbeed26617895ed10fc4778a11ddf89f9356645
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites. The document body is unreadable binary data, suggesting it's not intended for direct user interaction but rather to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/c3b8db4c7dce637f6a07e193c5e17911/77296281100.pdf In PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e4c76a65e---pefofagexajipusojag.pdfIn PDF document text
    • http://summithigh75.com/clients/867147/File/loparunutozowute.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/83269015754.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/purososik.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160adf96427365---jozonijezezi.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/53112711350.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/jabere.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083fc50a4ac4---bonodoz.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d563cd444e9---83958207177.pdfIn PDF document text
    • https://rosycaffe.com/file/208228443.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210604_F11A6C6206B45D98.pdfIn PDF document text
    • https://banghenails.com/upload/file/pikavokukufawowamame.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/98db186d6586b04134bdb611eb8abc48/metibuzibun.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b02ed5a36---regugonemilutinodoriwu.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ccaa99a82---68324052614.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1609d87b3dfaf0---5962907872.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0431827001619891643.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/napilusaxiralisabevezow.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160a64a1cee329---15526433568.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/a498839fe1771a57e490ec564bbe4165/53537619248.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/6ec5d753253a829b93041b6716a9bff8/dipafarixabajexosigu.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/5191522b4341818fd8c0031522da735e/nulabewediliwabopolidu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=hd+streamz+forPDF 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_off0000ea53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA53 26500 bytes
SHA-256: cc79af0cc1f8d9f25f395fd9aaa409e8ba712cf5111d1f4d4dda3071b010eb43
font_01_sfnt_off00012295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12295 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013aac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AAC 10324 bytes
SHA-256: bee7089407dd0f120750f664694dd55a41887a22612692c303fe5a54d9236534

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