Malicious PDF — malware analysis report

Static analysis result for SHA-256 57747a9a697beef1…

MALICIOUS

PDF

88.4 KB Created: 2021-09-23 05:26:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c18a60752e012df6980e7e13ae3701ce SHA-1: 4f0a9e70ac0ca4770c59d653bc20b505abbedf28 SHA-256: 57747a9a697beef17e9d3321ad102c10ba120c3367f1d478725700a50821a502
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://fqcycpa.com/jingkelun/userfiles/files/20210912004812.pdf In PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/t3iv97jppp1g715mc81f1il9d3/15271538704.pdfIn PDF document text
    • https://www.idd.no/ckfinder/userfiles/files/55590397450.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/kejolepirexanevax.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site/site/data/files/75596162480.pdfIn PDF document text
    • https://aynadakikemalizm.com/resimler/files/bewevegebajunuruvupavoz.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/94950792451.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/9f160881fa58e4ece749e4631cbd3814/96098902591.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/33336563963.pdfIn PDF document text
    • https://bc2000.order-pro.com/ckfinder/userfiles/files/tevamorajeweraruwomovima.pdfIn PDF document text
    • https://pastijptoto.com/contents/files/29306582144.pdfIn PDF document text
    • http://auto-rad.pl/userfiles/file/jitenonasodunikesopar.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/111441457290.pdfIn PDF document text
    • http://ilsungwarehouse.com/userData/ebizro_board/file/96015430806.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16135b4ee9bdab---38349823305.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/nakad.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/jexikizemujodeg.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/39219598771.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210909_170301_6162.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/75796883226.pdfIn PDF document text
    • http://euhoca.com/js/ckfinder/userfiles/files/rivujelemebivirudaza.pdfIn PDF document text
    • https://lalicorne-hotel.com/userfiles/file/xijanitexiluzapisafogikib.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/0ba5aa44d072be607a2165ff069f147f/vebamavovaroweb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=super+dragon+ball+heroes+all+episodes+english+dubbedPDF 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_off0000e827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE827 22588 bytes
SHA-256: fedc2209f63ee3b10f0a07cde34843a58ab0d82725df5b11dc8bbad49dbeabce
font_01_sfnt_off000122ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122EA 10888 bytes
SHA-256: 216a133cf8d9a85f07dc1f1e975e36de9fd292beed0d5a6307530ba9eac88cbb
font_02_sfnt_off00013b7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1