Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f95786afc6bd8b2…

MALICIOUS

PDF

88.1 KB Created: 2021-07-23 20:44:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4a183705979dc0c4d2a1c38cdeb59e82 SHA-1: 58cbdbbba0d7be80779d67f2ff3e265b3b6c2aaa SHA-256: 4f95786afc6bd8b23058658c03300fa632c8338854cc7ff6d1ee70b3ada173b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains a link farm pointing to multiple compromised WordPress upload directories, suggesting it's used to host or redirect to malicious content. The PDF itself does not contain readable text, but the heuristics indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608507d209b7b---kokidugolutusamezo.pdf In PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2a218ec9b---60838723471.pdfIn PDF document text
    • https://angkaganjil.com/contents//files/82219178334.pdfIn PDF document text
    • http://capableapp.com/uploads/files/zukopidesejudazupasegit.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/20931190652.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9c7eebeb0---67091722325.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/nolelofuzor.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/5862763479.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/f93b309d1895007f436dc99367bee440/zupofedapolutaz.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/pamukijopijirare.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16087c3e763eb7---89612846181.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16084e6a0d256a---52694580042.pdfIn PDF document text
    • http://fairview68.org/clients/c/ca/ca24e3df3ff7fa9b839de6c08aba9959/File/juxusuvovivuporifar.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/57544921078.pdfIn PDF document text
    • https://bnovum.hu/downloads/lorubupowize.pdfIn PDF document text
    • http://fairway.cc/images/blog//file/76711502247.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16084f72baa235---pexovisuxazeten.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/5531d7801343770183659c1d24d0eddf/zajitiwutezuviwulaxo.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a84bd25165d---siraxorigeji.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c52ebd36e32---zizamezixixizozide.pdfIn PDF document text
    • http://patroha.hu/file/36898389639.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/vaxemutimuliwum.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/e59a6e16628aac0c2c3fc03406003fae/mitedopunejokarugoru.pdfIn PDF document text
    • https://247hvac.ca/fabulous1/uploads/files/wamarifepaxolevexonet.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/saxuliguvejotazidafetebo.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c822851923---dasaturejiramujopujifu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+remove+the+paddle+from+a+bread+machinePDF 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_off0000f2df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010af1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF1 17568 bytes
SHA-256: 8d456ef739eb4f4a2e2ffcb80880985aa4974d9f888d4288cf8c3fb4a3a5c981
font_02_sfnt_off00013930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13930 11000 bytes
SHA-256: cfe98e787d5baae0ba4eb9bd276fa5817e0b2d667526fe37e80489acc743fa28

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