Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4d1462f116b57cf…

MALICIOUS

PDF

79.4 KB Created: 2021-09-12 05:45:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 85d3773f7539423daacd83534b30ddff SHA-1: 63d3071f60d0b9107405f26aaa0a246ca7fa8f65 SHA-256: c4d1462f116b57cf58a64978b61a1a6293a8fc1f0c3ad2f41cc78b6c8c3c2b26
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm for SEO poisoning or malicious redirection. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the structure and heuristic firings suggest an attempt to drive traffic to potentially harmful sites, likely as part of a broader phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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://weilandensemble.nl/ckfinder/userfiles/files/2726706469.pdf In PDF document text
    • http://unicaconsultoriarh.com/images/files/vetitexoloxigatosikijuze.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/fezax.pdfIn PDF document text
    • http://195exim.com/datas/files/39500246004.pdfIn PDF document text
    • http://ohdiabo.net/images/ckeditor/files/50115162340.pdfIn PDF document text
    • http://softwaretesting.kr/club/data/userfiles/file/20210910201714.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/ritepanufaximi.pdfIn PDF document text
    • http://patanjali.zohukum.com/ckfinder/userfiles/files/sotutovobamex.pdfIn PDF document text
    • https://macroedunet.com/userfiles/file/64200531614.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/tuxotogapurajavabimux.pdfIn PDF document text
    • http://qdjshg.com/files/file/jituzomib.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/ridosavizivojitirusulune.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613963246fb22---ditef.pdfIn PDF document text
    • https://amgaa.org/temp/files/rupusajajomomelifu.pdfIn PDF document text
    • https://wildnaturetravel.com/File/naleguvexaziduwado.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/megegikewa.pdfIn PDF document text
    • http://emachn.com/data/attachment/file/mafejipe.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4db77a344---lewakupabuwulevukizovi.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131d7fdeb253---42927811054.pdfIn PDF document text
    • http://friulanapanini.com/images/file/91498139005.pdfIn PDF document text
    • http://ih-consultant.com/ckfinder/userfiles/files/65938102926.pdfIn PDF document text
    • https://sgcaregiver.org/contents/files/butifonidukefig.pdfIn PDF document text
    • https://endobible.com/userfiles/file/jijuwokew.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/89807562ad82f34cc5471db0e174441d/fubivelavabujukumoxadota.pdfIn PDF document text
    • http://encino.ilovepokebar.com/uploads/files/71779598775.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=aplicacion+gratis+youtubePDF 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_off0000ce81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE81 18636 bytes
SHA-256: 871ed2a77a1240857513ebaaf5c0dd74634fbed25cd52769b8d3a1ad2d4d9085
font_01_sfnt_off0000fe90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE90 10884 bytes
SHA-256: b20275e9b34615e3f3d1823a6aa0efaa7a8c8e7d74276f5b2dac65e2594b255c
font_02_sfnt_off000117c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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