Malicious PDF — malware analysis report

Static analysis result for SHA-256 b725362311f94822…

MALICIOUS

PDF

73.2 KB Created: 2021-09-09 23:14:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4e45760decf7989c18c64fac87a2f107 SHA-1: d0860d0a206bf5ef2aeaea5d00f4dc0906201ea7 SHA-256: b725362311f9482248ff4a7f1c4ffcac727cb3f79ada41674776a416f2e404a4
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many embedded URLs pointing to potentially compromised or disposable hosting sites. The primary purpose appears to be directing users to external, untrusted resources, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jcbcharpentebois.com/ressource/site-image/files/82709309671.pdf In PDF document text
    • https://alteanetworks.fr/img/file/wugumomizafizixunuxag.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613616ecceecb---paxalos.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lavufezob.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/34287980478.pdfIn PDF document text
    • http://recrute.fr/files/files/vajutaxibaj.pdfIn PDF document text
    • http://all-paca.com/ckeditor/ckfinder/core/connector/php/uploads/files/42602551631.pdfIn PDF document text
    • http://gjbbang.com/userData/board/file/13694604935.pdfIn PDF document text
    • https://parc-hotel.info/file/wunifivaxenilezedizali.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/86671029550.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/66576703782.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/afggdiat7t8ph9rlkqelbj819l/45963088772.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613052a092937---gipekidapimifenipakikaj.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5c3710831---bijojalalafonovexakojuwa.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/5d9c462f1707e5037856c0e877bae368/xazoja.pdfIn PDF document text
    • https://istanajp.net/contents/files/rixopimuxanefiwewudi.pdfIn PDF document text
    • http://musicfriend.vn/public/default/ckeditor/files/butojisunibosifaseta.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210904202857.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/bamubeluxam.pdfIn PDF document text
    • http://mweb.cz/images/file/vemogu.pdfIn PDF document text
    • http://queenart.kr/userData/board/file/68380906447.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc9d713782---8725955440.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/jakegidoxipadunivemev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=minecraft+sword+mod+apkPDF 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_off0000b7ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7FF 10908 bytes
SHA-256: 23330960018f63e494fbf3161d28fdff19059b47d7dac5066a0e86ef1cc85066
font_01_sfnt_off0000d154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD154 18000 bytes
SHA-256: d7eaeff664401f89b96fd194c1eb16d4c002cb21c5b881c3a539362713b834d4
font_02_sfnt_off0000ff9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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