Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a0430a5b6d024b9…

MALICIOUS

PDF

92.0 KB Created: 2021-08-19 09:48:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: aa563bed0587396053759571ebe40cd3 SHA-1: 1fad2b83154da8b6263bfd7f485371199839ea6a SHA-256: 7a0430a5b6d024b92d56f67b5387a49daa731cfdb71ebb97a357204dad79361b
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as containing a link farm pointing to compromised CMS upload storage and disposable hosting. The ML classifier and ClamAV also identified it as malicious. While no scripts were extracted, the presence of numerous unknown URLs suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://murderescape.com/wp-content/plugins/super-forms/uploads/php/files/91e1bcc0a244c29f11e976ed7cdf8fa7/loxusosovaxero.pdf In PDF document text
    • http://allg-gyn.ch/userfiles/file/mopuruninumub.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/dc9e0leiur170m3uof22pj105i/pusobixidiv.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d75aa5caf---pidamegixakim.pdfIn PDF document text
    • http://montazerangroup.com/uploader/file/32243029515.pdfIn PDF document text
    • http://byecook.com/ckupload/files/ludubu.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757ef28c404---jatawelenudujoka.pdfIn PDF document text
    • http://vaughanreunion.com/clients/7/7c/7cfe0b8ff6d5e3136a6575a9b258a09c/File/fepogupijekegaxaduwelivon.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d37ae4e901---52625618425.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/gefipagoworij.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/55003096541.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/vaxipimoxazipoxiber.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/19137051568.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/8820732631.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1620921029.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/0e21e45f815487d6b9772d34ec2ec47a/guxikigi.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/dujaf.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/161060c806b0e4---kinegoselefoxuve.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/c60f1cce760b0f62bccd2d09b4bc9161/84671330102.pdfIn PDF document text
    • http://villahetzwartepaard.nl/survey/userfiles/files/jovobefixivovigomum.pdfIn PDF document text
    • http://fxlcd.com/upload/file/66722090752.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/79628300319.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=who+is+himawari+uzumaki+crushPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CA 11400 bytes
SHA-256: f9ee88e6cf2e5eac902e03df5fc500179e5eb624edde63025397d23397c31d7e
font_01_sfnt_off00010616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10616 16668 bytes
SHA-256: 14e5ab9102ba4b819690969dafc2b05cadbb5395d3889c0c16dfaee3fcf85210
font_02_sfnt_off000130f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001490c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1490C 10444 bytes
SHA-256: ee60340aeb6aea3a3e630859a3148bb70d911cbbdc09d52cfab15468742705ab

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