Malicious PDF — malware analysis report

Static analysis result for SHA-256 27298311091d6909…

MALICIOUS

PDF

88.4 KB Created: 2021-07-03 05:16:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f2a94aa20815f7e50d4640d4c4ccbc4c SHA-1: edff54899a15fe1ef7306037f32ac03cf73816e1 SHA-256: 27298311091d690932ab7a3ab9c525a1992aa42c14e928176df2980d0f3e6c09
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The 'SE_CLICKFIX' heuristic indicates the document likely attempts to trick users into executing commands, a common tactic for bypassing security measures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/v1gs4rba6nk9r25br6b2r6585e/kakufutuvofugem.pdf
    • http://vdadanang.vn/app/webroot/assets/files/25602344182.pdf
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/xometivusukipejebirexezi.pdf
    • https://madopin.com/calisma2/files/uploads/sezogo.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090a7a607552---zifesuvegatonexidad.pdf
    • https://btegypt.com/file/44015935989.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b227d1c1a0---71092646804.pdf
    • http://forumcutuca.com/ckfinder/userfiles/files/xabowuxi.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d71b3ccabb1---88444571542.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/cbeaeba0977852165d43c82c253edd1e/xuzas.pdf
    • http://dmkaudit.sk/101/upload/file/sozugabawikevogofiset.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac546f0c82e---64714922867.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/9nfsk3m2q439kkrg0ss0omp775/debiwijimod.pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/d4am79a9bj03hq0drp9ahj8ntr/67606815951.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/500004edd73ebb38ed0ff245e9ab6997/58002580938.pdf
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/4db43398558f9970ed04ec626b06c98d/vemeb.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c81e714e35---37992205177.pdf
    • http://thecoferfamily.com/clients/7/78/7892d776c92a08c80f86ebc6236678d2/File/wifugos.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebc8f42499---37354924059.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/amtk6iab6f9neh7kucq7r7gaub/fidebiwekijonabewakaxego.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/e21941bc64f3a1da7c4804382034d3b5/23929710366.pdf
    • http://bjaimama.com/data/upload/2021/06/file/202106212003404172.pdf
    • http://smiletoursvietnam.com/ckfinder/userfiles/files/73720028424.pdf
    • http://jeyadhurgatemple.com/userfiles/file/takijibufinagimivoro.pdf
    • http://arci-mp.fr/admin/File/watavina.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=driver+irql+not+less+or+equal+w10
    • 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_off0000f63d.bin
b666019cbdff70b6879a4c3a6bdcbbfa824495453c20da60c585426ff1a5459b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF63D 10676 bytes
font_01_sfnt_off00010eee.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EEE 16792 bytes
font_02_sfnt_off00012700.bin
4eadd4f1ad1ea97d6cfb7a5ad4107e52e718046b1a6eab69005e83eba8d2264c
pdf-font-stream PDF embedded font (sfnt) at offset 0x12700 17296 bytes