Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a2d62a8eeca7524…

MALICIOUS

PDF

84.1 KB Created: 2021-09-05 13:35:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9afb4b59e8aedbf5ffed64946a092f32 SHA-1: e0ec17f322a5e7b9c652d47db5c7cd511170dba5 SHA-256: 7a2d62a8eeca752486f62ea64aa4e122502f1b6a75ef6fb53d306a0e2fb581b9
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised websites or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the heuristic firings related to link farms and compromised CMS uploads are significant indicators.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://nmcs.ca/userfiles/files/2744661636.pdf In PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/davozig.pdfIn PDF document text
    • https://anup.bo/images/files/pizixomanafowemivojidu.pdfIn PDF document text
    • https://istanajpdua.com/contents//files/genogulifuzawimatizax.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/4511a8eac9f761a5f70b0841bdb2bd2c/75576952629.pdfIn PDF document text
    • https://www.studioline.ie/ckfinder/userfiles/files/12438324308.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/58818929209.pdfIn PDF document text
    • https://davaocarrental.com/images/file/20887303138.pdfIn PDF document text
    • http://euro520.net/userfiles/file/16224042531140979105.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160885307e8359---39534061541.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/2154869028.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/77671501600.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/pelul.pdfIn PDF document text
    • https://bulgariapools.com/contents//files/6127232671.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/95084895993.pdfIn PDF document text
    • http://silver.jo/ckfinder/blanc/files/15410429918.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16128d79d9206a---96430151254.pdfIn PDF document text
    • http://nhadephoanhao.vn/upload/ckupload/files/95994236085.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087fb3f6d6d9---nuwovajupejupud.pdfIn PDF document text
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/39947676057.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=konsensus+tb+2018+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_off0000e360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE360 10824 bytes
SHA-256: 5c684336194a6601d492e4c03c7e8a1ef927e932b95cfb23dbfc4f7ad256d20a
font_01_sfnt_off0000fc5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001146f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1146F 17772 bytes
SHA-256: 183f6d0e45ca50110ad4026b00e1e6f8dfb99f7e2a9e1933fd1e44e312dead9d