Malicious PDF — malware analysis report

Static analysis result for SHA-256 842e428b1b2dbc6f…

MALICIOUS

PDF

70.6 KB Created: 2021-09-06 10:18:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 61777c79f3ab804b753600482990612c SHA-1: 45c20fcbaa5e122e3a3eecc2edd57c97544a32a8 SHA-256: 842e428b1b2dbc6fd4da5e7cbd43fd9796f66d54d0850a5152fdd9292d282abb
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to numerous compromised websites, suggesting an attempt to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings indicates a strategy of using disposable or compromised hosting for its lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://jindi2010.com/uploadfile/files/83590400034.pdf In PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160aff55ae6e95---sodefusugixokuna.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/89906176501.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/39891744681.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/af85ebc2602a0467b431bea08bf0f31d/bukoxi.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/16071b212b48af---matepifizakawoxi.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210513050739_296186275.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/rh0p9tmp9hg67fqkl96a023l9p/37243358279.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/98977975664.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16074f735f37ff---kumeravupor.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/xufodavukamotulelivenasow.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/geziz.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20210807_8CCE2328BE96B7D2.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608147382d07c---rewugilodawadirusove.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948a95bd4a1---xomuv.pdfIn PDF document text
    • http://sgpeo.pl/users//file/fujomizevumefijomalujufo.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/e4652fc3c68635129118e4efc5663bb8/63316821245.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/sg7fqdcoq49qcup282uqttoabd/ludoto.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/1e8fe2b5aa339036fd57bed8048dacc5/vifupuborinovetetom.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8c92d44ff---tagubo.pdfIn PDF document text
    • http://pedraferro.com/files/files/telipat.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/fomefetiwe.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/161109e9d0dfee---judikuledeboxeralexefixu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=heteronyms+list+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_off0000b71a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB71A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF2C 15028 bytes
SHA-256: 5a1e823b4dda30aaac9e644e6c7429006f6b85b4404ab13c61df9dcfa1613203
font_02_sfnt_off0000f52a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52A 10604 bytes
SHA-256: ae5e579b8f7ba570caf632daee49746727b4cb6c4c54dd5881250388c3b87cd5

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