Malicious PDF — malware analysis report

Static analysis result for SHA-256 4457c0ee66ef8e81…

MALICIOUS

PDF

83.5 KB Created: 2021-09-05 11:37:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f2c7bbe84acac0a87a81ca9e820a7db4 SHA-1: 1601214665364bd6156e6fcc9d022e1aec1b6312 SHA-256: 4457c0ee66ef8e8149d17d67a9a5d821ba5bf091a93bb4f1112516391aa68482
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage, suggesting it's designed to redirect users to malicious content. The 'SE_CALLBACK_LURE' heuristic indicates the document may attempt to trick users into calling a fraudulent support number, consistent with phishing or scam tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160a14d7065a32---mopogexufupujobemubiruk.pdf In PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/5c5vm369s1buuk43be6o2alp9e/xurosarevo.pdfIn PDF document text
    • http://www.tempshift.com/app/webroot/files/uploadimagesfile/tekepotefizipalaso.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/9hdilm9ib6m2bn8dh812g49qi4/sefixot.pdfIn PDF document text
    • https://aneri12.eu/res/file/gibigufisiroveropenu.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/a8ec1085f4fb95b9b19def836fce3be0/zutuxe.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/4c7dbf4fd2cd0d755fc2d9a90fae850f/73850338431.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d9e27ce7a---lagidu.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/9jcrs5q5su29tdjeekupnqhden/95312462391.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/sawudanulukiv.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210716_3E9907DF2BA86C6A.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084cf3111924---17835591423.pdfIn PDF document text
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/semisunekizajagu.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/punuse.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/b3e440351e0940702210e5f221f90787/75437043625.pdfIn PDF document text
    • https://dm288.com/slicice/file/litamukawamupuwakak.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/tkf6udmalng67cgd0um49h5ap6/jabomiwosuwevotigojejiku.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/dofike.pdfIn PDF document text
    • https://ahha.az/userfiles/file/14755543502.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/55cfe085f90eabe3603a5805feeadab5/89748932457.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc56e145eb---majovofimu.pdfIn PDF document text
    • http://kavernoklub.com/campannas/file/78959769999.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/2b094596a3ab575274e49fe49aff63c7/tolefojebeberudigabogofuz.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/b7cd46dbb3b5d8aede5e7c55ecf3882c/govaritanunopavinanu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=nwu+application+form+2018+pdf+mafikeng+campusPDF 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_off0000dbd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD8 11720 bytes
SHA-256: 048f35df71b92b5fbc05723cd34438ef004d0631a3a0ba98e039d9c05b67f677
font_01_sfnt_off0000f7cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDE 18340 bytes
SHA-256: f99b39089254dcae1d38abcc90a7e34ea0e3abd649e53f891502d358963a0fe9

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