Malicious PDF — malware analysis report

Static analysis result for SHA-256 84c7aacf5828c915…

MALICIOUS

PDF

83.0 KB Created: 2021-09-23 13:30:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f3a0f48821bef57021d6c13807348c24 SHA-1: e17d8ec7ecfa6ada3eb43a48fcc0cb288c4849c8 SHA-256: 84c7aacf5828c9154730f0e64a4ba8f0742cc62e3c903efebc3fc3870eaefee1
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating phishing and trojan behavior. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' parameters in some URLs indicates a potential phishing or SEO manipulation tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://chcial.ru/uplcv?utm_term=mobile+legends+apk+download+2020 PDF link annotation
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/jupk7kmdao133v7222kn0oa006/40874283994.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/42949492836.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/71758457792.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/2520172d57c1c5a6566264db2b1dbece/milonafavivewuvexabez.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613fad92d2bc5---wepamefivawaxojasoxopamus.pdfIn PDF document text
    • https://recrut.com/files/files/judusosomabidawawovataw.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/bb24a6cc644c7f789a6cedc513d2ac6e/87345073661.pdfIn PDF document text
    • http://xsjsbzrw.com/uploads/files/zojonakajonezabire.pdfIn PDF document text
    • http://mariondhuique-mayer.com/data/file/wefabodi.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/woxajasixinetogutuji.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/29790621406.pdfIn PDF document text
    • http://www.dreamstoreonline.es/ckfinder/userfiles/files/71549156860.pdfIn PDF document text
    • http://metapolar.hu/tmp/47777856663.pdfIn PDF document text
    • http://cutskytools.com/d/files/37918786619.pdfIn PDF document text
    • http://steffis-strassladen.de/userfiles/file/28386270840.pdfIn PDF document text
    • https://thepainter.asia/upload/files/94120808025.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/29605727683.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/bafofobupufizutexebab.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/rojufevapusugod.pdfIn PDF document text
    • https://mabuksusu2.com/contents/files/repezikawikejame.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/gobixijuzotesewo.pdfIn PDF document text
    • https://www.idd.no/ckfinder/userfiles/files/42635906842.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614978faba01e---10584119002.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/013c94134ed6baed051546c2cd86f484/39394833143.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/dasodumezeleted.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/sijovomonunokoz.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/jaloxopiwuxubar.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_off0000defa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFA 17916 bytes
SHA-256: 19de4be45dab10ee70d82ef91960125d92e3e6cb0c196622f5133a44b4b6c565
font_01_sfnt_off00010cc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124DC 10924 bytes
SHA-256: 5987c63d58911040755bb3549d086477247ee1db7a140474c42125af1543cd23

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