Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cfa67104d793758…

MALICIOUS

PDF

91.1 KB Created: 2021-08-16 20:04:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2618982e010282bfae2d123f2549624a SHA-1: f2c2402908a82cd08fc0f68d6b1ef9607aec6507 SHA-256: 4cfa67104d79375874f064ae8000e5652a878d0cf039cde6fa1109dec05a65f3
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 high likelihood of malicious intent. It contains a link farm pointing to compromised WordPress upload storage, suggesting it's designed to trick users into downloading further malicious content. The presence of embedded URLs and the 'PDF link farm points to compromised-WordPress upload storage' heuristic strongly support a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/6bcb3922d5fa5d3e7598e6bdb0d93772/92860715769.pdf In PDF document text
    • http://dieta-plus.pl/userfiles/file/litipir.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/folekufe.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/3742639653.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c1a558822---tasajegewifojo.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/vilakisetazo.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/71496667079.pdfIn PDF document text
    • http://msinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/89337002685.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/58097519709.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/4e0f907a7da599353917a3e179f602a4/26690712520.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd41ae109b---62464423545.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/tekexatelu.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/40042669730.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/9205c065b69138025adf0c085f075790/31804739529.pdfIn PDF document text
    • https://neksav.com/upload/ckfinder/files/pagega.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/745434d97d4843e0541aa1d2cc8c2976/59460897230.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/12f1f375fd62dd69e6439b89c133b69b/47535207647.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/c612d5454327643e2cce4da570a2f9f0/fiwokurojuxinesa.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/72606911292.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/16077960350a12---33172561617.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a33c3ee1f2---68153273406.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/60443705812.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/h5jo91montmnkn5kvf9esvrv73/dinibeses.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/xalaluwuvefu.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///xisugodo.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/eij3qcucbbbeuccdss11lnnncr/kumubukiripiduleguja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=console+sniffer+free+no+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E8 17956 bytes
SHA-256: 45ac5037fdeb4344fc54d2b15a65329b0f4fa47af133b7b8180717dbbf9db95e
font_01_sfnt_off00012673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12673 10368 bytes
SHA-256: 24f2de2a3e0e3eba06a1d90ec15575d9321e2ef4d017e6a81fab5129efb91f0c
font_02_sfnt_off00013e0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E0A 1704 bytes
SHA-256: 2d59b2b1bb9a6f9bbf889029c1db5c2207fa4dbd30617e885d593f86b64e3e7b
font_03_sfnt_off00014611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14611 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1