Malicious PDF — malware analysis report

Static analysis result for SHA-256 c05f4329c13060f9…

MALICIOUS

PDF

73.1 KB Created: 2021-07-06 00:56:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 50480b2dc9e2dc2bf88fac11fae96a1a SHA-1: ecca2cf31b9cd24e19faf8d2696a643a9ce7963e SHA-256: c05f4329c13060f9044d3af2802c8f9ec94af0f0edaa8e929ecf2c2845ddc83e
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The PDF structure and embedded links are indicative of a phishing or malware delivery campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/2c33ee62a1d8a6d6e06f86e341b27e91/24979550880.pdf In PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/9e0lcrcfud228hcl73d3jvu5a2/karuwomiletusubamuridavuk.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbf7e6784c---xipuruzez.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/todelawufefekazabipegavu.pdfIn PDF document text
    • http://keacg.com/upload/files/18896187115.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/o51mf5lkfpqe5omp9udj86u4os/49662697432.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/qiobljqfqpgvfniv2un3qdvdis/7217182739.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609453273d288---98514049970.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160dd9116ba365---kabuvewol.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/37906098227.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/jekadezazogogedon.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/49057547720.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160766d5d1541a---18683270701.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b0124d92a53---99459569654.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/88025211148.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/varomapaferovikuwimodir.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbb59592e8---46968851657.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/79400707115.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a7429030843---napagizadobib.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nexotibedunum.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982d3e65217---70794826943.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160700ab7690f4---97687422331.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=who+wrote+look+out+here+comes+tomorrowPDF 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_off0000ba20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD237 10408 bytes
SHA-256: 6af5f82b0f88ba42944d5f28ad028aa5e72f0701e6b710373dd94857c2386f95
font_02_sfnt_off0000e9ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EC 17332 bytes
SHA-256: d50a19e68c70b3c5f6094cf196b7b8929a4f183cf151164a5eefa5c7f47c19ed

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