Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1bea493ac3b3957…

MALICIOUS

PDF

74.4 KB Created: 2021-09-10 16:19:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 32df97bc023b5af3abae62153bcf3847 SHA-1: 94218eb060133f7317921e9a9d5fc38dee9b40e8 SHA-256: f1bea493ac3b3957c848653696863608aef1ff60d3c2332aad6b93bc63a36cbb
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a 'utm_term' parameter in one URL further supports the phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://queure.ru/uplcv?utm_term=tekken+tag+tournament+android+download
    • http://chongros.com/userData/board/file/somabowekin.pdf
    • http://kelkenaghshband.com/app/webroot/img/files/tunirumap.pdf
    • http://ttmplus.com/userfiles/files/90375086864.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135bf4580226---61473792709.pdf
    • http://importfoodfair.com/userfiles/image/2021/09/file/97372119035.pdf
    • http://jump360.co/upload/files/20210905180609.pdf
    • http://quimicahj.com/admin/userfiles/userfiles/file/81314371265.pdf
    • https://fetogram.com/images/upload/files/38788374250.pdf
    • http://kliknetezde.cz/admin/obrazky/file/23046285578.pdf
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/44146157791.pdf
    • http://mediedil.eu/userfiles/files/zeralagijuto.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff8f02a60a---vuviliwunu.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/611h4ahsf5t6albuagm1lpn1mj/6630911886.pdf
    • https://eghamatkade.com/basefile/eghamatkadecom/files/91177209578.pdf
    • https://juraganmonyet.com/contents/files/wibusutepov.pdf
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/lupadijenu.pdf
    • https://alhasooncorp.com/Files/files/wazuzipimulatexogorugebor.pdf
    • https://surupaceanu.ro/ckfinder/userfiles/files/sejavo.pdf
    • http://donghotam.com/luutru/files/88317282362.pdf
    • http://venkateshservices.com/uploads/sokibopudat.pdf
    • http://royalrep.com/userfiles/files/menidini.pdf
    • https://almudenafernandez.co/ckfinder/userfiles/Files/10542412361.pdf
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/jigigebabusulapoj.pdf
    • http://stmarysharipad.com/userfiles/file/tujuvewid.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bfee.bin
2b6da7cea3ecf5ccbd9b74f650943ec064431fdd1c32d57e70757bccf06ae9c7
pdf-font-stream PDF embedded font (sfnt) at offset 0xBFEE 16768 bytes
font_01_sfnt_off0000eb7a.bin
6aa0318425315428a1d4e2c51a0255373f35ab56961252f7bb226b35e287a35a
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7A 10664 bytes
font_02_sfnt_off000103be.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x103BE 16792 bytes