Malicious PDF — malware analysis report

Static analysis result for SHA-256 4662232ac1134442…

MALICIOUS

PDF

80.4 KB Created: 2021-09-15 21:09:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: bafe6ce903cf79c6f7e51f6768303d2b SHA-1: b8d8f603cee7bdb82f5b0bf3e0e169b30010b9da SHA-256: 4662232ac1134442e08f350264b9164c5a977485b262916aba198ca702d97e7a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It contains a link farm with numerous URLs, many hosted on compromised or disposable domains, designed to redirect users to potentially malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://leinerpakgelatine.com/survey/userfiles/files/92284533514.pdf In PDF document text
    • https://telliogluhukuk.com/userfiles/file/44392784503.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/93855536502.pdfIn PDF document text
    • http://kingsfci.com/userfiles/file/winuvopot.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/88566581617.pdfIn PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/kerinonuxaguseremada.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132752828543---madalenopoliwiwozezesi.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613b83267faf9---54846213343.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/beaa33f727b349a4864e2b8b62b9a7fc/fosolin.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109150900315281.pdfIn PDF document text
    • https://windfreeklima.com/upload/ckfinder/files/nenepujorekufezokobodov.pdfIn PDF document text
    • http://edituj.cz/res/file/kiwame.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/7gq9uu6dgiourkjlauqn8mep9n/komuvugazajunapivetom.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/17838005177.pdfIn PDF document text
    • https://anakmeong.com/contents/files/1584348770.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/lhdvd2gnke43h4gc9lukdhrtn0/82485914609.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/90521913603.pdfIn PDF document text
    • http://ryyw.com/upload/files/2021/09/202109141448476613.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb28798a41---dadokuroxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=login+to+my+live+emailPDF 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_off0000d53a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD53A 10320 bytes
SHA-256: 5b78b01e0e557e4cbdedfa48a9bfc692dfc3a981e1b0382a4785774a867072a9
font_01_sfnt_off0000ec7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001048c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1048C 18432 bytes
SHA-256: 1f1e6627e6abd68f171d108490d20d94ab23382b04aa2a54026c179c7f14ac42