Malicious PDF — malware analysis report

Static analysis result for SHA-256 724bdfb2562e7f3c…

MALICIOUS

PDF

93.9 KB Created: 2021-07-06 19:46:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 73846b92bf0c17ed5e052723896b041f SHA-1: d63e7443b8284e696b65b407a7fc2c31e2fb1a16 SHA-256: 724bdfb2562e7f3c83ff465e522ea613c9199a7a5989306909d0e7616a5b63e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc49bbabf5c---xujepavenulediriropupatu.pdf In PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/903c7f2ef9b1e937f424a05119eb34d6/ravomizakasoj.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160ae49c1195b7---dazusekigaxigewa.pdfIn PDF document text
    • https://kede.org/userfiles/file/81538932171.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092ce19806c2---vereziwajigexolod.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/15132592537.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f3a15feaa---4139309231.pdfIn PDF document text
    • https://istanajpdua.com/contents//files/wezuderapuxuditavexu.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/85088523151.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609717abe2700---xawekemi.pdfIn PDF document text
    • http://ballstonfamilymedicine.com/clients/861402/File/89473352848.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/vikofededuralepoboba.pdfIn PDF document text
    • http://techhssilverbuffs.com/clients/61416/File/datovokuvabuxakato.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/17d64fjvqg29d8gptbj508vdi1/nevepusabasavurus.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f43d25b78---tamiwedalemabawobovineri.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e4561769c54---zinivudet.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/7c6e8092caab7fe906a97ee293f0eefa/tipoxozujonidoxibirifosa.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/3ab61qijpfg69tojc0rba7j5c1/5781651826.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c74ebdbfc9---51632051828.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a254d0955b---zojasinaborog.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3239b60fe---5049173421.pdfIn PDF document text
    • http://granitemountainranch.net/userimages/96516874614.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160a91d9e814bf---tudanejilofezifek.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d2c397e07ec---74618450205.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/7fa089f30f8c88d43de83c300d6d441e/ketipibududisotowoduwej.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e3b52f9cc22---24820381986.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210604090927_cGlyaWxhYm93ZXdhdGlwYWxlZGly.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=outright+games+dreamworks+dragons+dawn+of+new+riders+gamePDF 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_off000106ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CE 17996 bytes
SHA-256: 1036f096ed5a17c38def91a2872e1b4d90faadddad0125effb15c488b0945493
font_01_sfnt_off0001362c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1362C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014e43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E43 11056 bytes
SHA-256: f4e9e13cb46cf81c7ec1217b34cddfa0d1d8578e83b7725a12719a6f49c3142f