Malicious PDF — malware analysis report

Static analysis result for SHA-256 16ecd7185b195658…

MALICIOUS

PDF

74.9 KB Created: 2021-10-02 11:35:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7fc4efe866fda9c7ef119093368e4e87 SHA-1: bff12ece25a1b7279bb8ff22e99d044dbb154697 SHA-256: 16ecd7185b195658145d0a2c865f7eb1e61462ced5661384bc2ae192dd06ebc9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains an embedded JavaScript stream and a link farm pointing to multiple domains, some of which are hosted on compromised WordPress sites or disposable hosting. The embedded JavaScript likely facilitates malicious actions, such as downloading further payloads or redirecting the user, contributing to the phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://amirafouad.com/uploaded_files/file/70695350297.pdf In PDF document text
    • http://plechotice.sk/tmp/file/kesovogorulek.pdfIn PDF document text
    • http://valkexclusief.reviews/app/webroot/files/userfiles/files/20622829016.pdfIn PDF document text
    • http://pressvaluation.net/FCKeditor/editor/filemanager/connectors/userfiles/file/fubigadabosixalolugafuj.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/likufewinule.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/161475879e2b30---6542593908.pdfIn PDF document text
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/11246149295.pdfIn PDF document text
    • https://junona.manyel.website/images/uploads/medium/98093793578.pdfIn PDF document text
    • http://abwingsde.com/uploads/files/nijuloxageli.pdfIn PDF document text
    • https://ciiinnovationsummit.com/ci/userfiles/files/25808903632.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/f600fd096cb202965a51f976e0b3803f/7242161385.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16142520ab8fab---tabewifav.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/riwukoxurapigigiwukutiz.pdfIn PDF document text
    • https://rajatotogroup2.com/contents/files/74131679390.pdfIn PDF document text
    • http://poultech.net/d/files/tepidanelime.pdfIn PDF document text
    • http://mamitobe.ru/files/file/90897755913.pdfIn PDF document text
    • http://citranco.com/users/files/49702261740.pdfIn PDF document text
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/puxazu.pdfIn PDF document text
    • https://zahrek.com/userfiles/file/44671479847.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/m3lk8keqanr9v5s354bkm01gv1/lutopopud.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/kumibuzajoje.pdfIn PDF document text
    • http://sushistoryus.com/uploads/files/gadevifeguluzefexefun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=remark+tamil+meaningPDF link annotation
    • http://www.cst.rnu.tn/js/ckfinder/userfiles/files/birodajumim.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_off0000b84c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB84C 10300 bytes
SHA-256: 09fcd0cf62309881b2ca8f1f0b4642b3dab71087b56c79ba303ffc1b2fc6f31b
font_01_sfnt_off0000cf6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF6B 21304 bytes
SHA-256: 9f7bdc65cfc0d37c02c9c8ccc1c2bc1ee3f0e84248adc14236440a308e62d44a
font_02_sfnt_off000105f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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