Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c6921f5aac7fc81…

MALICIOUS

PDF

79.3 KB Created: 2021-09-07 19:53:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 358af26bcce5372009dd40f4bdacba20 SHA-1: 01de4f52eaaa080a3bb86e139fbeeed0a1fb40b2 SHA-256: 5c6921f5aac7fc81b809451c284e7d8d3f406a3e0327e9a1e4d1423034c2b4d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm pointing to multiple disposable or compromised domains, suggesting an attempt to redirect users to malicious content. The presence of numerous unknown URLs reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://tanriovermensucat.com/uploads/genel/files/53177137088.pdf In PDF document text
    • http://jadever.vn/Images_upload/files/dalapazititale.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/digesolizixiko.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/vulivadunapikiferuw.pdfIn PDF document text
    • http://ottuk-e.org/userData/board/file/vidizikagebo.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/kipasoxizejirona.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/08/15/53959866237.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/48872045323.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/g5rull0dcadjsboeb15estjihs/60253091061.pdfIn PDF document text
    • https://daiichigroup.net/uploads/news_file/77757843273.pdfIn PDF document text
    • http://alltechsro.cz/files/korafeg.pdfIn PDF document text
    • https://2acontractor.it/images/file/pugadikovekefoxufugu.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f8899b720---faloxum.pdfIn PDF document text
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/32eb19f240528e15685fd7be2d223576/23458077070.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/b84f525eadd908493a42cf654824a4a4/25707568511.pdfIn PDF document text
    • https://kiaavcilar.com/upload/ckfinder/files/26467860687.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/8763c9992ebecde62707d0940eb5b8c5/88855538146.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///69768648657.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/7832801c0aa9f3060c3d843c738d33e3/pupelatiwizogelodofatura.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/labinidariterojita.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a3ff0f7c0---nonelujopajezimitu.pdfIn PDF document text
    • https://badrivishal.com/media/98358771561.pdfIn PDF document text
    • http://proxima-design.cz/files/file/dodaxapev.pdfIn PDF document text
    • http://oldadmin.k12cart.com/media/files/23669836213.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=rheology+of+drilling+fluids+pdfPDF 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_off0000d1ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1AD 17372 bytes
SHA-256: 8e5e7d8bff4b7b933513121a0822fb0e78b56a392c0b988ed88b4d5b86ecad72
font_01_sfnt_off0000ff0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11722 10776 bytes
SHA-256: cd2bbd31e9381dff6d55a855d35fe0354cef09edeba79c7c02d123db5ea5df31