Malicious PDF — malware analysis report

Static analysis result for SHA-256 836e6563c18b061a…

MALICIOUS

PDF

70.7 KB Created: 2021-08-04 04:49:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 383082fa770daca5010be23d6deae4c2 SHA-1: 18c3ab56e7953b6d77534b306fdf6201f0959ed2 SHA-256: 836e6563c18b061aa61aea424be3d6b6209805b422829535a7d09839be739d44
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://allytemp.ru/uplcv?utm_term=how+much+does+a+half+barrel+of+busch+light+cost PDF link annotation
    • http://zxpgw.com/userfiles/file/xapedonoribo.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/wazipovesuxululuzasipos.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3aa5c374cc---wagadopolawerizo.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/45259613011.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ad44c4678---xosasiwugebaluworonuz.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072679ae89cd---43451375286.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607363222263f---ruxofet.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/8676b81717a7a82751b28ab2e37ae44a/vulesajotiro.pdfIn PDF document text
    • http://avtokit116.ru/!upload/files/jajuged.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/5f5a51d072d8bd09968c86c99b66c705/8880847037.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3791a44626---62083557800.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/12103897667.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/14258704072.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160a237176bd76---80959564391.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/fejitogusizodatofawav.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/38274460534.pdfIn PDF document text
    • https://areicon.com/images/file/14672412468.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/56802336055.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/vudonagadabazom.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/rebevorezozukemefiv.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/040810516397.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/vusezimovabotagesovixi.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb7a1e48f4---lininetutor.pdfIn PDF document text
    • 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_off0000b4e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4E9 15056 bytes
SHA-256: 3ac0b19e6eb49717e2d9b629a27aaf25f3a18cf2e5d199b640224af5a268dce1
font_01_sfnt_off0000db38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB38 11136 bytes
SHA-256: 40c28f5351e27b91f73cc683a87246a7cff59319519b1012ce2baec342c856a5
font_02_sfnt_off0000f50a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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